TDA7541B AM/FM car radio tuner IC with stereo decoder and intelligent selectivity system Features ■ FM part – AGC generation by RF and IF detection – I/Q mixer for 1st IF 10.7 MHz with image rejection – Mixer for 2nd IF 450 kHz – Internal 450 kHz band pass filter with bandwidth control by ISS – Fully integrated FM demodulator with noise cancellation ■ AM part – Wide and narrow AGC generation – Mixer for 1st IF 10.7 MHz, AM up conversion – Mixer for 2nd IF 450 kHz – Integrated AM-demodulator – AM IF noise blanking ■ Stereo decoder – PLL with adjustment free, fully integrated VCO – Automatic pilot dependent MONO/STEREO switching – Programmable ROLL-OFF compensation – High cut and stereo blend-characteristics programmable – Dedicated RDS mute – Audio noise blanker ■ Additional features – VCO for world tuning range Table 1. July 2009 LQFP64 – High performance fast PLL for RDSSystem – IF counter for FM and AM with search stop signal – Quality detector for level, deviation, adjacent channel and multipath – ISS (Intelligent selectivity system) for cancellation of adjacent channel and noise influences – Adjacent channel mute – Fully electronic alignment – Independent weather band input – All functions I2C bus controlled Description The TDA7541B is a high performance tuner circuit with stereo decoder for AM/FM car radio. It contains a mixer, IF amplifier, demodulator for AM and FM, stereo decoder, quality detection, ISS filter and PLL synthesizer with IF counter on a single chip. Use of BICMOS technology allows the implementation of several tuning functions and a minimum of external components. Device summary Order code Package Packing TDA7541B LQFP64 (10 x 10 x 1.4 mm) Tray TDA7541BTR LQFP64 (10 x 10 x 1.4 mm) Tape and reel TDA7541BW LQFP64 (14 x 14 x 1.4 mm) Tray TDA7541BWTR LQFP64 (14 x 14 x 1.4 mm) Tape and reel Doc ID 16048 Rev 1 1/77 www.st.com 1 Contents TDA7541B Contents 1 Block circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 Pin connection and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 4 2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical specifications and characteristics . . . . . . . . . . . . . . . . . . . . 10 3.1 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3.1 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3.2 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3.3 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 3.3.4 Stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.3.5 PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1 4.2 FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.1 Mixer 1 AGC and IF amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.2 Mixer2, limiter, FM demodulator and spike cancellation . . . . . . . . . . . . 26 4.1.3 Quality detection and ISS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 4.1.4 Block diagram quality detection principle . . . . . . . . . . . . . . . . . . . . . . . . 29 4.1.5 Strong adjacent channel correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.1.6 Weak signal mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 4.1.7 Weather band input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.2.1 4.3 4.4 2/77 Usage of control bit ADSEL (Addr23D7) . . . . . . . . . . . . . . . . . . . . . . . . 32 Stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.3.1 Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.3.2 Noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 4.3.3 Functional description of the multipath detector . . . . . . . . . . . . . . . . . . 37 4.3.4 Quality detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.3.5 AFS control and stereo decoder mute . . . . . . . . . . . . . . . . . . . . . . . . . . 37 PLL and IF counter section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Doc ID 16048 Rev 1 TDA7541B Contents 4.5 5 4.4.1 PLL frequency synthesizer block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 4.4.2 IF counter block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 I2C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Software specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.1 Chip address and overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 5.2 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 5.3 Control register function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5.4 Data byte specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 6 Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Doc ID 16048 Rev 1 3/77 List of tables TDA7541B List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Table 17. Table 18. Table 19. Table 20. Table 21. Table 22. Table 23. Table 24. Table 25. Table 26. Table 27. Table 28. Table 29. Table 30. Table 31. Table 32. Table 33. Table 34. Table 35. Table 36. Table 37. Table 38. Table 39. Table 40. Table 41. Table 42. Table 43. 4/77 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Globals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 FM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 AM section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Stereo decoder section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 PLL section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 ISS filter control by I2C bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Internal ISS control signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ISS control modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Usage of ADSEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Address organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 I2C control bit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Subaddress description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Addr 0 TPLL charge pump control (0Bh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Addr 1 TPLL Counter 1 (LSB). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Addr 2 TPLL Counter 2 (MSB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Addr 3 TV(00h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Addr 4 TV/IF Counter (FM ACh, AM 1Ch) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 Addr 5 TPLL Divider (FM 3Dh, AM 2Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 Addr 6 AGC (FM 06h, AM 2Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 Addr 7 Quality AC (FM 50h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Addr 8 Quality ACM/MP (FM 6Ah) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Addr 9 Quality Dev (FM 49h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 Addr 10 Quality MUX/FSU (FM 0Eh, AM 0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Addr 11 Weak Signal Mute (FM A8h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 Addr 12 AM IF NB (AM B1h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Addr 13 XTAL adjust(80h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 Addr 14 IF2 adjust (FM E8h, AM 08h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 Addr 15 IQ adjust / Switch (FM E7h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 Addr 16 FM keying AGC (FM 1Dh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59 Addr 17 Roll off / Level gain (77h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 Addr 18 SD Stereoblend / AM corner frequency (0Dh) . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 Addr 19 SD High cut (2Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Addr 20 SD MP (FM 97h, AM 3Fh). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 Addr 21 SD Quality (FFM 7Ah, AM FAh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 Addr 22 SD NB I (FM 05h, AM 04h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 Addr 23 SD NB II (FM E2h, AM C2h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Addr 24, 26, 27, 28, 29 testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Addr 25 Testing (FEh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 Doc ID 16048 Rev 1 TDA7541B List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Block circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Programming of HC filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Programming of stereo blend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Adaptive threshold control of noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Stereo blend controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Deviation controlled threshold adjust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Block diagram FM part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 Block diagram VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Block diagram ISS function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 Block diagram AM path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 Block diagram stereo decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Block diagram audio noise blanker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Block diagram multi path detection for stereo decoder. . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 LQFP64 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 Doc ID 16048 Rev 1 5/77 Block circuit diagram 1 Block circuit diagram Figure 1. 6/77 TDA7541B Block circuit diagram Doc ID 16048 Rev 1 TDA7541B Pin connection and pin description 2 Pin connection and pin description 2.1 Pin connection GNDVCC2 MIX2AMPOUT VCC2 MIX2REF MIX2OUT AMRFAGCTC MIX2INREF MIX2IN AMAGC2TC IF1REF IF1AMPOUT VCCIF1 IF1AMPIN GNDIF MIX1REF Pin connection (top view) MIX1OUT Figure 2. 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 VREF1 2 47 AMIF2IN AMMIX1IN 3 46 GNDDEM AMRFAGCOUT 4 45 FMREFDEMC WB 5 44 AMIF2REF AMMIX1RAF 6 43 MPXOUT AMPINDR 7 42 MUTETC FMMIX1IN1 8 41 MPXIN GNDRF 9 40 AMREFDEMC FMMIX1IN2 10 39 MPTC TV 11 38 GNDSTD FMPINDR 12 37 FSWO FMAGCTC 13 36 VCC1 VCOB 14 35 R VCOE 15 34 L VCCVCO 16 33 GNDVCC1 Doc ID 16048 Rev 1 XTALD ISSTC2 ISSTC1 XTALG FSTC FSU SCL SDA SSTOP SW LPF LPHC VREF2 23 24 25 26 27 28 29 30 31 32 LPOUT 17 18 19 20 21 22 MUX 1 DEVTC GNDVCO VCCMIX1 7/77 Pin connection and pin description 2.2 Pin description Table 2. Pin description Pin No. 8/77 TDA7541B Pin name Function 1 VCCMIX1 Mixer1 Supply 2 DEVTC Deviation Detector Time Constant 3 AMMIX1IN AM Mixer1 Input 4 AMRFAGCOUT AM RF AGC Voltage Output 5 WB Weather Band Input 6 AMMIX1REF AM Mixer1 Reference 7 AMPINDR AM Pin Diode Driver Output 8 FMMIX1IN1 FM Mixer1 Input1 9 GNDRF RF Ground 10 FMMIX1IN2 FM Mixer1 Input2 11 TV Tuning Voltage Preselection 12 FMPINDR FM Pin Diode Driver Output 13 FMAGCTC FM AGC Time Constant 14 VCOB VCO Input Base 15 VCOE VCO Output Emitter 16 VCCVCO VCO Supply 17 GNDVCO VCO Ground 18 LPOUT OpAmp Output to PLL Loop Filter 19 VREF2 Voltage Reference for PLL OpAmp 20 LPF OpAmp Input to PLL Loop Filter 21 LPHC High Current PLL Loop Filter Input 22 SW Free Programmable Switch Output 23 MUX Multiplexer Output 24 SSTOP Search Stop Output 25 SDA I2C Bus Data 26 SCL I2C Bus Clock 27 FSU Unweighted Field Strength Output 28 FSTC S-meter Filtering Capacitor 29 XTALG Xtal Oscillator to MOS Gate 30 ISSTC1 ISS Filter Time Constant1 (slow) 31 ISSTC2 ISS Filter Time Constant2 (fast) 32 XTALD Xtal Oscillator to MOS Drain 33 GNDVCC1 Digital Ground Doc ID 16048 Rev 1 TDA7541B Pin connection and pin description Table 2. Pin description (continued) Pin No. Pin name Function 34 L Stereo Decoder Output Left 35 R Stereo Decoder Output Right 36 VCC1 Digital Supply 37 FSWO Weighted Field Strength Output 38 GNDSTD Stereo Decoder Ground 39 MPTC Multipath Detector Time Constant 40 AMREFDEMC AM Demodulator Reference 41 MPXIN Stereo Decoder Input 42 MUTETC Weak Signal Mute Time Constant 43 MPXOUT AM Audio / MPX Output 44 AMIF2REF AM IF2 Amplifier Reference Voltage 45 FMREFDEMC FM Demodulator Reference 46 GNDDEM FM Demodulator Ground 47 AMIF2IN AM IF2 Amplifier Input 48 VREF1 5V Reference 49 GNDVCC2 Analog Ground 50 MIX2AMPOUT MIXER2 Amplifier Output 51 VCC2 Analog Supply 52 MIX2REF Mixer2 Reference 53 MIX2OUT Mixer2 Output 54 AMRFAGCTC AM RF AGC Time Constant 55 MIX2INREF Mixer2 Input Reference 56 MIX2IN Mixer2 Input 57 AMAGC2TC AM AGC2 Time Constant 58 IF1REF IF1 Amplifier Reference 59 IF1AMPOUT IF1 Amplifier Output 60 VCCIF1 IF1 Supply 61 IF1AMPIN IF1 Amplifier Input 62 GNDIF1 IF1 Ground 63 MIX1REF Mixer1 Reference 64 MIX1OUT Mixer1 Output Doc ID 16048 Rev 1 9/77 Electrical specifications and characteristics TDA7541B 3 Electrical specifications and characteristics 3.1 Thermal data Table 3. Thermal data Symbol Parameter RTH(j-amb) Thermal resistance junction-to-ambient 3.2 Max. Value Unit 70 °C/W Absolute maximum ratings Table 4. Absolute maximum ratings Symbol Parameter Conditions Value Unit Supply voltage - 9.5 V Tamb Ambient temperature - -40 to 85 °C Tstg Storage temperature - -55 to +150 °C 2 kV Machine Model 100 V Charged Device Model 300 V VS Human Body Model VESD ESD withstand voltage 3.3 Electrical characteristics 3.3.1 Globals Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, in application circuit, unless otherwise specified. Table 5. Item Globals Symbol Parameter Test conditions Min. Typ. Max. Unit 1. Supply 1.1 VCC1 Digital supply voltage - 7.7 8.5 9 V 1.2 VCC2 Analog supply voltage - 7.7 8.5 9 V 1.3 VCCVCO VCO supply voltage - 7.7 8.5 9 V 1.4 VCCMIX1 Mixer1 supply voltage - 7.7 8.5 9 V 1.5 VCCIF IF1 Supply Voltage - 7.7 8.5 9 V 1.6 ICC1 Supply current FM ON - 19 23 mA 1.7 ICC1 Supply current AM ON - 21 25 mA 1.8 ICC2 Supply current FM ON - 48 58 mA 1.9 ICC2 Supply current AM ON - 37 44 mA 10/77 Doc ID 16048 Rev 1 TDA7541B Table 5. Item Electrical specifications and characteristics Globals (continued) Symbol Parameter Test conditions Min. Typ. Max. Unit 1.10 ICCVCO Supply current - - 12 15 mA 1.11 ICCMIX1 Supply current FM ON - 32 40 mA 1.12 ICCMIX1 Supply current AM ON - 20 24 mA 1.13 ICCIF Supply current - - 4 5 mA 2. Reference voltages 2.1 VREF1 Internal reference voltage IREF1 = 0mA 4.8 5 5.2 V 2.2 VREF2 Internal reference voltage IREF2 = 0mA 2.4 2.5 2.6 V 3. I2C bus interface 3.1 fSCL Clock frequency - - - 400 kHz 3.2 VIL Input low voltage - - - 1 V 3.3 VIH Input high voltage - 2 - - V 3.4 IIN Input current - -5 - 5 µA 3.5 VO Output acknowledge voltage IO = 1.6mA - - 0.4 V 3.3.2 FM section Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, fRF = 98 MHz, dev = 40 kHz, fMod = 1 kHz, in application circuit, unless otherwise specified. Table 6. Item FM section Symbol Parameter Test conditions Min. Typ. Max. Unit 4. Wide band RF AGC 4.1 V8-10 Lower threshold start V13 = 2.5 V, RFK “0” - 79 - dBμV 4.2 V8-10 Upper threshold start V13 = 2.5 V, RFK”0” - 93 - dBμV 4.3 Δ V8-10 Control range RF KAGC KAGC”000”, RFAGC”00”, V37 = 3.0….3.7 V, RFK”1” 5 8 11 - 5. Narrow band IF and keying AGC 5.1 V61 Lower threshold start KAGC = off, V8-10 = 0 mVRMS - 82 - dBµV 5.2 V61 Upper threshold start KAGC = off, V8-10 = 0 mVRMS - 94 - dBµV 5.3 V61 Max. IFAGC threshold with KAGC KAGC”000”,IFAGC”00”, V37 = 3.0 V - 97 - dBµV 5.4 V37 Start point KAGC KAGC”000”,IFAGC”00”, 3.2 3.4 3.6 V 5.5 Δ V61 Control range IF KAGC KAGC”000”,IFAGC”00”, V37 = 3.2….3.9 V 12 15 18 dB - - VREF1 +VBE V 6. AGC time constant output 6.1 V13 Max. AGC output voltage V8-10= 0 mVRMS Doc ID 16048 Rev 1 11/77 Electrical specifications and characteristics Table 6. TDA7541B FM section (continued) Item Symbol Parameter Test conditions Min. Typ. Max. Unit 6.2 V13 Min. AGC output voltage V8-10 = 100 mVRMS - - 0.5 V 6.3 I13 Min. AGC charge current V8-10= 0 mVRMS,V13 = 2.5 V -33 -25 -17.5 µA 6.4 I13 Max. AGC discharge current V8-10 = 100 mVRMS,V13 = 2.5 V 1.7 2.5 3.3 mA 15 25 35 µA 7. AGC PIN diode driver output 7.1 I12 AGC OUT, current min. V8-10 = 0 mVRMS, V12 = 2.5V 7.2 I12 AGC OUT, current max. V8-10 = 50 mVRMS, V12 = 2.5 V - - -16 mA 8. FM I/Q Mixer1 (10.7 MHz) 8.1 RIN Input resistance Differential 8 10 12 kΩ 8.2 CIN Input capacitance Differential - 4 - pF 8.3 ROUT Output resistance - 530 660 790 Ω 8.4 V8,11 Input DC bias - 2.2 2.5 2.8 V 8.5 G Gain Unloaded 20 22 24 dB 8.6 Gl Gain With 330 Ω load 14 16 18 dB 8.7 INOISE Equivalent input noise - - 3 - nV/√Hz 8.8 CP1dB 1dB compression point Referred to diff. mixer input - 100 - dBµV rd 8.9 IIP3 3 order intermodulation - - 119 - dBµV 8.10 IQP I/Q phase adjust PH -7 - +8 DEG 8.11 IRR Image rejection ratio Ratio wanted/image 30 40 - dB 8.12 IRR Image rejection ratio With phase adjust 40 46 - dB 9. WB I/Q Mixer1 (10.7 MHz) 9.1 RIN Input resistance Single ended 1.7 2.5 3.3 kΩ 9.2 CIN Input capacitance Single ended - 3 - kΩ 9.3 ROUT Output resistance - 530 660 790 Ω 9.4 V5 Input dc bias - 2 2.3 2.6 V 9.5 G Gain unloaded 24 26 28 dB 9.6 INOISE Equivalent Input noise Source impedance 400 Ω - 2.3 - nV/√Hz 9.7 IIP3 3rd order intermodulation - - 113 - dBµV 10. IF1 amplifier (10.7 MHz) 10.1 RIN Input resistance - 265 330 396 Ω 10.2 CIN Input capacitance - - 2.5 - pF 10.3 V61 DC input voltage - - VCCIF1/3 - V 10.4 ROUT Output resistance - 265 330 396 Ω 10.5 COUT Output capacitance - - 2.5 - pF 12/77 Doc ID 16048 Rev 1 TDA7541B Table 6. Electrical specifications and characteristics FM section (continued) Item Symbol 10.6 V59 DC output voltage 10.7 Gmin 10.8 Gmax 10.9 10.10 10.11 Min. Typ. Max. Unit - - VCCIF1/2 - V Min. gain IFG - 9 - dB Max. gain IFG - 21 - dB INOISE Equivalent input noise voltage Gmax, Rgen=330 Ω, RL=330 Ω, noise of Rgen not included - 3.2 - nV/√Hz CP1dB 1 dB compression point referred to 330 Ω input, Gmax - 99 - dBµV 3rd referred to 330 Ω input, Gmax - 130 - dBµV 240 300 360 Ω IIP3 Parameter order Intermodulation Test conditions 11. Mixer2 (450kHz) 11.1 RIN Input resistance Differential 11.2 CIN Input capacitance - - 2.5 - pF 11.3 V55.56 DC input voltage - 3.7 4 4.3 V 11.4 ROUT Output resistance - 100 - - kΩ 11.5 COUT Output capacitance - - 2.5 - pF 11.6 V52,53 DC output voltage - 3.7 4 4.3 V 11.7 gm Conversion transconductance WB Mode; referred to MIX2OUT - 126 - µA/V 11.8 G Gain FM Mode, referred to MIX2OUT - 16 - dB 11.9 Cstep Min. cap. Step IF2A - 2.2 - pF 11.10 Cmax Max. cap. IF2A - 33 - pF 11.11 INOISE Equivalent input noise voltage, including buffer mixer2 Rgen = 330 Ω, IF2Q”10” noise of Rgen not included - 15 - nV/√Hz 11.12 CP1dB 1dB compression point referred to 330 Ω input,IF2Q”10” - 116 - dBμV 3rd referred to 330 Ω input,IF2Q”10” - 132 - dBμV - 0.1 0.3 % 11.13 IIP3 order Intermodulation 12. Demodulator, audio output 12.1 THD Total harmonic distortion Dev.= 75 kHz, V56= 100 dBµV, IF2Q”11” 12.2 aAM AM suppression V56 =100 dBµ, Δf = 40 KHz, fmod =1 kHz, fmod =1 kHz@AM, m =0.3 % 40 60 - dB 12.3 VMPX MPX output signal Dev.= 75 kHz 440 500 560 mVRMS 12.4 ROUT Output impedance - 20 40 60 Ω 12.5 RLOAD Load resistance - 10 - - kΩ Doc ID 16048 Rev 1 13/77 Electrical specifications and characteristics Table 6. Item TDA7541B FM section (continued) Symbol Parameter Test conditions Min. Typ. Max. Unit 70 - - dB 40 - - dB Δf = 40 kHz, fmod =1 kHz, 12.6 12.7 (S+N)/N (S+N)/N V56 =100 dBµV, Signal plus noise-to-noise De-emphasis = 50 µs, ratio at MPXOUT B = 200 Hz to 15 kHz ISSENA = 0 Δf = 3.5 kHz, fmod =1 kHz, Signal plus noise-to-noise V56 =100 dBµV, ratio De-emphasis = 75 µs, In weatherband mode setting see Table 10 13. Quality detection Unweighted field strength (FSU) and weighted field strength 13.1 V37 DC output voltage V56 = 20 dBμV, FMON=1, FSWO = OFF - 2.5 - V 13.2 V37 DC output voltage V56 = 50 dBμV, FMON=1, FSWO = OFF - 3 - V 13.3 V37 DC output voltage V56 = 70 dBμV, FMON=1, FSWO = OFF - 3.5 - V 13.4 V37 DC output voltage V56 > 120 dBμV, FMON=1, FSWO = OFF - 4.6 - V 13.5 ΔV37 Slope - - 25 - mV/dB 13.6 ΔV37 DC offset - -200 - 0 mV 13.7 ROUT Output impedance FSWO 17 23.5 30 kΩ 13.8 V27 DC output voltage V56 = 20 dBμV, FMON=1, SL=”101” - 0.1 0.4 V 13.9 V27 DC output voltage V56 = 50 dBμV, FMON=1, SL=”101” - 1 - V 13.10 V27 DC output voltage V56 = 70 dBμV, FMON=1, SL=”101” - 2 - V 13.11 V27 DC output voltage V56 > 120 dBμV, FMON=1, SL=”101” 4 - - V 13.12 ΔV27 Slope - - 50 - mV/dB 13.13 ROUT Output impedance FSU 320 400 480 Ω 13.14 Rload Load resistor FSU - 20 - kΩ 13.15 V27 DC output voltage AM V47 = 20 dBμV, FMON = 0, SL= ”010” - 0.1 0.3 V 13.16 V27 DC output voltage AM V47 = 40 dBμV, FMON = 0, SL= ”010” - 1.25 - V 13.17 V27 DC output voltage AM V47 = 60 dBμV, FMON = 0, SL= ”010” - 3.0 - V 13.18 V27 DC output voltage AM V47 > 100 dBμV, FMON = 0, SL= ”010” 4.5 - - V 14/77 Doc ID 16048 Rev 1 TDA7541B Table 6. Electrical specifications and characteristics FM section (continued) Item Symbol 13.19 ΔV27 13.20 fLP Parameter Test conditions Min. Typ. Max. Unit Slope AM FMON=0 - 90 - mV/dB -3 dB frequency low pass AM FMON=0 - 40 - kHz - - 32 - dB -3 dB frequency highpass ACF=0 - 100 - kHz Adjacent channel gain 13.21 GAC Gain Adjacent channel filter 13.22 fHP 13.23 f-20dB Attenuation 20dB - - 70 - kHz 13.24 fBP Centre frequency ACF=1 - 100 - kHz - - 12 - dB Multipath channel gain 13.25 GMP Gain Multipath bandpass filter 13.26 fC Centre frequency - - 19 - kHz 13.27 Q Quality factor - 5 8 10 - 14. ISS (intelligent selectivity system) filter 450kHz 14.1 fcentre Centre frequency fREF_intern = 450kHz 14.2 BW 3dB Bandwidth, -3 dB ISSBW = 1 70 80 90 kHz 14.3 BW 20dB Bandwidth, -20 dB ISSBW = 1 132 150 168 kHz 14.4 BW 3dB ISSBW = 0 106 120 135 kHz 14.5 BW 20dB Bandwidth, -20 dB ISSBW = 0 220 250 280 kHz 14.6 BW 3dB WBON = 1 18 22 26 kHz 14.7 BW 20dB -20dB weather band WBON = 1 - 70 - kHz Bandwidth, -3 dB Bandwidth weather band 450 kHz Adjacent channel ISS filter threshold 14.8 VTHAC Internal low threshold ACTH - 2.75 - V 14.9 VTHAC Internal high threshold ACTH - 3.05 - V Multipath threshold 14.10 VTHMP Internal low threshold MPTH - 0.50 - V 14.11 VTHMP Internal high threshold MPTH - 1.25 - V ISS filter time constant 14.12 I30,31 Charge current low mid TISS, BWDEF = 1 -89 -74 -59 µA 14.13 I30,31 Charge current high mid TISS, BWDEF = 1 -72 -60 -48 µA 14.14 I30,31 Charge current low narrow TISS, BWDEF = 1 -148 -124 -99 µA 14.15 I30,31 Charge current high narrow TISS, BWDEF = 1 -132 -110 -88 µA 14.16 I30,31 Discharge current low TISS, BWDEF = 0 0.5 1 1.5 µA Doc ID 16048 Rev 1 15/77 Electrical specifications and characteristics Table 6. TDA7541B FM section (continued) Item Symbol Parameter Test conditions Min. Typ. Max. Unit 14.17 I30,31 Discharge current high TISS, BWDEF = 0 11 15 19 µA 14.18 V30,31 Low voltage BWDEF = 0 - 0.1 0.2 V 14.19 V30,31 High voltage BWDEF = 1 4.6 4.9 - V ISS filter switch threshold 14.20 V30,31 Threshold ISS on BWDEF = 0 - 3 - V 14.21 V30,31 Threshold ISS off BWDEF = 0 - 1 - V 14.22 V30,31 Threshold ISS narrow on BWDEF = 0 - 4 - V 14.23 V30,31 Threshold ISS narrow off BWDEF = 0 - 2 - V Deviation detection 14.24 I3 Charge current low TDEV -40 -32 -20 µA 14.25 I3 Charge current high TDEV -48 -39 -30 µA 14.26 I3 Discharge current low TDEV 0.5 1 1.5 µA 14.27 I3 Discharge current high TDEV 5.5 8 10.5 µA 14.28 DEVWTH Internal low threshold DWTH, I3 = 1 µA - 20 - kHz 14.29 DEVWTH Internal high threshold DWTH, I3 = 1 µA - 50 - kHz 14.30 RATIOmin Referred to threshold DTH - 1 - 14.31 RATIOmax Referred to threshold DTH - 1.5 - 15. Weak signal mute 15.1 V37 Upper start point WMTH = 0, WMD = 7, VIN=V56, AF = -3 dB - 2.9 - V 15.2 V37 Lower start point WMTH = 7, WMD = 7, VIN=V56, AF = -3 dB - 2.7 - V 15.3 aWMD Min. mute depth WMD = 0, WMTH = 7, V56 =OFF 10 14 - dB 15.4 aWMD Max. mute depth WMD = 7, WMTH = 7, V56=OFF 22 26 - dB 15.5 aMTHISS Mute threshold below WMTH for ISS filter “ON” WMD, WMTH, VIN=V56 - 1 - dB 15.6 VACMTH Internal AC mute threshold ACMTH 40 - 260 mV 15.7 aACMD AC mute depth ACMD 3 - 8 dB 15.8 I42 Charge current - -65 -47.5 -30 μA 15.9 I42 Discharge current - 1.5 2.5 4 μA 16. Multiplexer output 16.1 V23 Output voltage low - - 0.1 0.2 V 16.2 V23 Output voltage high - 4.6 4.9 - V 16.3 ROUT Output resistance - 200 250 300 Ω 16.4 R23load Load resistor - 20 - - kΩ 16/77 Doc ID 16048 Rev 1 TDA7541B 3.3.3 Electrical specifications and characteristics AM section Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, fRF = 1 MHz, m = 30%, fmod = 1 kHz, in application circuit, unless otherwise specified. Table 7. Item AM section Symbol Parameter Test conditions Min. Typ. Max. Unit 17. Global 17.1 VANT_US Usable sensitivity (1) (S+N)/N = 26 dB 17.2 (S+N)/N Signal to Noise Ratio 17.3 aIF IF1 rejection 17.4 V3 Min. RF AGC threshold 17.5 V3 Max. RF AGC threshold 17.6 V61 Min. IF AGC threshold 17.7 V61 Max. IF AGC threshold 17.8 V56 Min. DAGC threshold V56 Max. DAGC threshold 17.9 - 19 25 dBµV Ref.: V3 = 80 dBµV 50 55 - dB S/N = 26 dB, m = 30 %, fmod = 1 kHz 70 80 - dB - 92 - dBµV - 104 - dBµV - 78 - dBµV - 102 - dBµV - 86 - dBµV - 98 - dBµV RFAGC IFAGC DAGC 18. AGC voltage driver output 18.1 V4 Max. AGC output voltage - 3.3 3.5 - V 18.2 V4 Min. AGC output voltage - - - 0.5 V 18.3 | I4 | AGC current V4 = 0 V, V54 = 3.5 V, LNA”00” - 340 - µA - - - -15 mA 19. AGC PIN diode driver output 19.1 I7 AGC driver current 20. AM Mixer1 (10.7 MHz) 20.1 RIN Input resistance differential 45 - - kΩ 20.2 CIN Input capacitance differential - 2.5 - pF 20.3 ROUT Output impedance - 530 660 790 Ω 20.4 CP1dB 1dB compression point referred to diff. mixer input - 112 - dBμV 20.5 V3,6 Input DC bias - 0.3 0.4 0.55 V 20.6 IIP3 3rd - - 132 - dBμV 20.7 INOISE Equivalent input noise - - 5.5 - nV/√Hz 20.8 G Gain With 330 Ω filter 3 5.5 7 dB order intermodulation 21. AM mixer2 21.1 RIN Input resistance - 240 300 360 Ω 21.2 CIN Input capacitance - - 2.5 - pF 21.3 V55.56 DC input voltage - 3.8 4 4.2 V 21.4 ROUT Output resistance - 100 - - kΩ Doc ID 16048 Rev 1 17/77 Electrical specifications and characteristics Table 7. TDA7541B AM section (continued) Item Symbol 21.5 COUT Output capacitance - - 2.5 - pF 21.6 V52,53 DC output voltage - 3.7 4.0 4.3 V 21.7 gm Conversion transconductance MIX2OUT - 440 - µA/V 21.8 Gmax Max. gain L = 560 µH, Q = 28; C = 180 pF, referred to MIX2OUT - 26 - dB 21.9 ΔG Gain control range - - 20 - dB 21.10 Cstep Min. cap. Step IF2A - 2.2 - pF 21.11 Cmax Max. cap. IF2A - 33 - pF 21.12 INOISE Equivalent input noise voltage, including buffer mixer2 Amax, Rgen= 330 Ω, RL = 2 kΩ, noise of Rgen not included - 11 - nV/√H z 21.13 CP1dB 1dB compression point Amax, referred to 330 Ω input - 114 - dBμV Amax, referred to 330 Ω input - 132 - dBμV 21.14 IIP3 Parameter rd 3 order Intermodulation Test conditions Min. Typ. Max. Unit 22. Buffer AM mixer2 22.1 ROUT Output resistance - 1.6 2 2.4 kΩ 22.2 COUT Output capacitance - - 2.5 - pF 22.3 V50 DC output voltage - 3.7 4.0 4.3 V 22.4 G gain RL = 2 kΩ -8 -6 -4 dB 23. AM IF2 amplifier 23.1 RIN Input resistance - 1.6 2 2.4 kΩ 23.2 CIN Input capacitance - - 2.5 - pF 23.3 V44,47 DC input voltage - 4.1 4.3 4.5 V 23.4 Gmax Max. gain - 49 52 55 dB 23.5 ΔG Gain control range - 36 38 40 dB 23.6 INOISE Equivalent input noise voltage Gmax, Rgen = 2 kΩ, noise of Rgen not included - 9.5 - nV/√Hz 23.7 CP1dB 1 dB compression point Gmax, referred to 2 kΩ input - 74 - dBμV - 100 - dBμV 140 190 240 mVRMS - 62 - dBµV 50 55 - dB - 50 - µA/V rd 23.8 IIP3 3 order Intermodulation Gmax, referred to 2 kΩ input 23.9 V23 IF2 output voltage V56 = 90 dBV, m = off 24. AMAGC2 24.1 VAGC(start) AGC start voltage (PIN47) Input carrier voltage 24.2 ΔAGC AGC2 range Between start of AGC2 and the intervention point of prestage AGC 24.3 gAGC Control slope Seek mode 18/77 Doc ID 16048 Rev 1 TDA7541B Table 7. Electrical specifications and characteristics AM section (continued) Item Symbol Parameter Test conditions Min. Typ. Max. Unit 24.4 gAGC Control slope normal mode - 5 - µA/V 24.5 II57I Max. AGC charge current Seek mode - 125 - μA 24.6 II57I Max. AGC charge current normal mode - 5 - μA 24.7 V57 Max. AGC output voltage V47 = 100 dBµ 4.6 4.8 - V 24.8 V57 Min. AGC output voltage V47 = 20 dBµ - 0.2 0.5 V V56 = 90 dBµ, m = 30 %, fmod = 1KHz 170 200 230 mVRM V56 = 90 dBµ, m = 30 %, fmod = 1 kHz - 0.3 0.5 V56 = 90 dBµ, m = 80%, fmod = 1 kHz - 0.5 0.9 - 20 25 30 Ω 25. AM audio output 25.1 V43 Audio output voltage 25.2 THD Total harmonic distortion 25.3 25.4 ROUT Output impedance S % 26. IF noise blanking 26.1 tbl Min. blanking time - - 8 - μs 26.2 tbl Max. blanking time - - 17 - μs 26.3 Vth Min internal threshold - - 50 - mV 26.4 Vth Max. internal threshold - - 187.5 - mV 26.5 Vthstep Threshold step - - 12.5 - mV 1. Can be reached in application circuit, not measured. 3.3.4 Stereo decoder section Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, VMPX = 500 mVrms mono, f = 1 kHz, de-emphasis τ = 50 µs, in application circuit, unless otherwise specified. Table 8. Item Stereo decoder section Symbol Parameter Test conditions Min. Typ. Max. - - 0.5 0.93 WBON = 1 - 0.05 0.06 Unit 27. Stereo decoder 27.1 Vin MPX input level 27.3 Rin Input resistance - 80 100 120 kΩ 27.4 GSTD Stereo decoder gain - 2 2.5 3 dB 27.5 GSTDWB Stereo decoder gain Weather band mode 23 26 27 dB 27.6 SVRR Supply voltage ripple rejection Vripple = 100 mV, f = 1 kHz - 60 - dB 27.2 Doc ID 16048 Rev 1 Vrms 19/77 Electrical specifications and characteristics Table 8. TDA7541B Stereo decoder section (continued) Item Symbol 27.7 A 27.8 27.9 Parameter Test conditions Min. Typ. Max. Unit 35 40 - dB channel separation VMPX = 500 mVrms stereo, only L/R, ROC adjusted THD Total harmonic distortion - - 0.02 0.3 % (S+N)/N Signal plus noise to noise ratio A-weighted, 19 kHz notch - 85 - dB 28. Mono/stereo switch 28.1 VPTHST1 Pilot threshold voltage for Stereo, PTH = 1 5 8 12 mVrms 28.2 VPTHST0 Pilot threshold voltage for Stereo, PTH = 0 7 11 16 mVrms 28.3 VPTHMO1 Pilot threshold voltage for Mono, PTH = 1 3.5 6 10 mVrms 28.4 VPTHMO0 Pilot threshold voltage for Mono, PTH = 0 6 9 14 mVrms 18.9 - 19.1 kHz 29. 19kHz PLL 29.1 flock Capture range Pilot magnitude 20 mVrms = 4 % 29.2 DP Pilot deviation range fpilot = 19 kHz 4 - 30 % 30. De-emphasis and high cut 30.1 tHC50 De-emphasis time constant DEEMP=0, High Cut OFF 45 50 55 μs 30.2 tHC75 De-emphasis time constant DEEMP = 1, High Cut OFF 67 75 83 μs 30.3 tHC50 High cut time constant DEEMP = 0, High Cut ON, V28=0.1V 135 150 165 μs 30.4 tHC75 High cut time constant DEEMP= 1, High Cut ON, V28 = 0.1 V 200 225 250 μs 30.5 AAmmin Min. Attenuation in AM Voutmax/Vout@ f = 3.5 kHz, DEEMP = 0, AMCF “111” - 3.6 - dB 30.6 AAmmax Max. Attenuation in AM Voutmax/Vout@ f = 3.5 kHz, DEEMP= 0, AMCF “000” - 8 - dB 31. Stereo blend and high cut control 31.1 LGmin Min. level gain LG -0.3 0 0.3 dB 31.2 LGmax Max. level gain LG 7.75 8.25 8.75 dB 31.3 LGstep Level gain step Resolution - 0.25 0.55 0.85 dB 31.4 VSBLmin Min. voltage for mono SBC 24 29 34 %VREF1 31.5 VSBLmax Max. voltage for mono SBC 53 58 63 %VREF1 31.6 VSBLstep Step resolution SBC 3.5 4.2 5 %VREF1 31.7 VHCHmin Min. voltage for no high cut HCHT 37 42 47 %VREF1 31.8 VHCHmax Max.voltage for no high cut HCHT 61 66 71 %VREF1 20/77 Doc ID 16048 Rev 1 TDA7541B Table 8. Item Electrical specifications and characteristics Stereo decoder section (continued) Min. Typ. Max. Unit HCHT 7 8 9 %VREF1 31.10 VHCLmin Min. voltage for full high cut HCLT 6 11 16 %VHCH 31.11 VHCLmax Max. voltage for full high cut HCLT 28 33 38 %VHCH 31.12 VHCLstep Step resolution 6.5 7.3 8.1 %VHCH 31.9 Symbol Parameter VHCHstep Step resolution Test conditions HCLT 32. Carrier and harmonic suppression at the output 32.1 a19 Pilot signal f = 19 kHz - 45 50 - dB 32.2 a38 Subcarrier f = 38 kHz - - 75 - dB 32.3 a57 Subcarrier f = 57 kHz - - 62 - dB 32.4 a76 Subcarrier f = 76 kHz - - 90 - dB 33. Intermodulation (1) 33.1 a2 fmod = 10 kHz, fspur =1 kHz - - 65 - dB 33.2 a3 fmod = 13 kHz, fspur =1 kHz - - 75 - dB 34. Traffic radio (2) 34.1 a57 35. SCA 35.1 Signal f = 57 kHz - 65 70 - dB Signal f = 67 kHz - - 75 - dB (3) a67 36. ACI – adjacent channel interference (4) 36.1 a114 Signal f = 114 kHz - - 95 - dB 36.2 a190 Signal f = 190 kHz - - 84 - dB 37. FM noise blanker 37.1 VTRMIN Min. trigger threshold (5) VPEAK=0.8 V, NBLT “111” - 147 - mVOP 37.2 VTRMAX Max. trigger threshold (5) VPEAK=0.8 V, NBLT “000” - 280 - mVOP 37.3 VTRNOISE Min. noise controlled trigger threshold VPEAK = 1.5 V, NBCT “11” - 450 - mVOP 37.4 VTRNOISE Max. noise controlled trigger threshold VPEAK = 1.5 V, NBCT “00” - 1200 - mVOP 37.5 VPEAK Peak voltage NBRR “00”, VMPX = 0 mV - 0.8 - V 37.6 VPEAK Peak voltage NBRR “00”, VMPX = 50 mV, f = 150 kHz - 1.9 - V 37.7 VPEAK Peak voltage NBRR “00”, VMPX = 200 mV, f = 150 kHz - 3.5 - V 37.8 VPEAKDEV Min. deviation dependent peak voltage VMPX = 500 mV, NBDC = 11 (“OFF”) - 0.8 - V 37.9 VPEAKDEV Max. deviation dependent VMPX = 500 mV, NBDC= 00 peak voltage - 2.0 - V Doc ID 16048 Rev 1 21/77 Electrical specifications and characteristics Table 8. TDA7541B Stereo decoder section (continued) Item Symbol Parameter 37.10 VPEAKFS Min. fieldstrength controlled peak voltage 37.11 VPEAKFS 37.12 Test conditions Min. Typ. Max. Unit VMPX=0mV, VLEVEL<< VSBL (fully mono), NBFC = 11 (“OFF”) - 0.8 - V Max. fieldstrength controlled peak voltage VMPX=0mV, VLEVEL<< VSBL (fully mono), NBFC = 00 - 2.0 - V TS Min. blanking time Signal HOLDN in testmode, NBT = 00 - 38 - μs 37.13 TS Max. blanking time Signal HOLDN in testmode, NBT = 11 - 22 - μs 37.14 SRPEAK Noise rectifier charge Signal PEAK in testmode, NBPC =0 - 5 - mV/μs 37.15 SRPEAK Noise rectifier charge Signal PEAK in testmode, NBPC=1 - 12 - mV/μs 37.16 VRECTADJ Noise rectifier discharge adjustment Signal PEAK in testmode, NBRR=00 - 0.3 - V/ms 37.17 VRECTADJ Noise rectifier discharge adjustment Signal PEAK in testmode, NBRR=01 - 1.8 - V/ms 37.18 VRECTADJ Noise rectifier discharge adjustment Signal PEAK in testmode, NBRR=10 - 2.8 - V/ms 37.19 VRECTADJ Noise rectifier discharge adjustment Signal PEAK in testmode, NBRR=11 - 4 - V/ms 37.20 VADJMP Noise rectifier adjustment by multipath Signal PEAK in testmode, VMPTC=1V, NBSMP=0, NBMP=1, NBRR=01 - 3 - V/ms 37.21 VADJMP Noise rectifier adjustment by strong multipath influence Signal PEAK in testmode, VMPTC = 1V, NBSMP = 1, NBMP = 0, NBRR = 01 - 4 - V/ms 37.22 VADJMP Noise rectifier adjustment by multipath and strong multipath influence Signal PEAK in testmode, VMPTC=1 V, MBSMP=1, NBMP=1, NBRR=01 - 5.2 - V/ms 38. Multipath detector 38.1 GMP Min. multipath gain MPG = 00 5 6 7 dB 38.2 GMP Max. multipath gain MPG = 11 11 12 13 dB 38.3 GRECTMP Min. rectifier gain MPRG = 01 -1 0 1 dB 38.4 GRECTMP Max. rectifier gain MPRG = 11 5 7.6 9 dB 38.5 ICHMP Rectifier charge current MPCC = 0 0.5 0.8 1.1 μA 38.6 ICHMP Rectifier charge current MPCC = 1 0.2 0.4 0.7 μA 38.7 IDISMP Rectifier discharge current 0.5 1 - mA 0.5 0.6 0.7 - 39. Quality detector 39.1 22/77 a Min. quality detector coefficient QDC Doc ID 16048 Rev 1 TDA7541B Table 8. Electrical specifications and characteristics Stereo decoder section (continued) Item Symbol Parameter 39.2 a Max. quality detector coefficient 39.3 b 39.4 b Test conditions Min. Typ. Max. Unit QDC 0.9 1.05 1.2 - Min. quality noise gain QNG 5 6 7 dB Max. quality noise gain QNG 13 15 17 dB 1. Intermodulation suppression V o ( signal ,@1 kHz ) a2 = --------------------------------------------------------------- ;ƒs = ( ( 2 × 10 kHz ) – 19 kHz ) V o ( spurious ,@1 kHz ) V o ( signal ,@1 kHz ) a3 = --------------------------------------------------------------- ;ƒs = ( ( 3 × 13 kHz ) – 38 kHz ) V o ( spurious ,@1 kHz ) measured with: 91 % stereo signal; 9 % pilot signal; fm = 10 kHz or 13 kHz. 2. Traffic radio (V.F.) suppression V o ( signal ,@1 kHz ) a57 ( V ,W ,F ) = ----------------------------------------------------------------------------------------V o ( spurious ,@1 kHz ) ± 23 kHz measured with: 91% stereo signal; 9% pilot signal; fm=1 kHz; 5% sub carrier (f=57 kHz, fm=23 Hz AM, m=60 %) 3. SCA (subsidiary communications authorization) V o ( signal ,@1 kHz ) a67 = --------------------------------------------------------------- ;ƒs = ( ( 2 × 38 kHz ) – 67 kHz ) V o ( spurious ,@9 kHz ) measured with: 81 % mono signal; 9 % pilot signal; fm=1 kHz; 10 % SCA - sub carrier (fS = 67 kHz, unmodulated) 4. ACI (adjacent channel interference) V o ( signal ,@1 kHz ) a114 = --------------------------------------------------------------- ;ƒs = ( 110 kHz – ( 2 × 38 kHz ) ) V o ( spurious ,@4 kHz ) V o ( signal ,@1 kHz ) a190 = --------------------------------------------------------------- ; ƒs = ( 186 kHz – ( 5 × 38 kHz ) ) V o ( spurious ,@4 kHz ) measured with: 90 % mono signal; 9 % pilot signal; fm=1 kHz; 1% spurious signal (fS = 110 kHz or 186 kHz, unmodulated) 5. All thresholds are measured in test mode at the quality output. The thresholds are calculated by VNBTH - VPEAK. VPEAK can be adjusted by applying a 150 kHz sinewave at MPXIN. Doc ID 16048 Rev 1 23/77 Electrical specifications and characteristics 3.3.5 TDA7541B PLL section Tamb = 25 °C, VCC1 = VCC2 = VCCMIX1 = VCCVCO = VCCIF = 8.5 V, fXtal = 10.25 MHz, VMPX = 500 mVrms mono, f = 1 kHz, de-emphasis τ = 50 µs, in application circuit, unless otherwise specified. Table 9. PLL section Item Symbol Parameter Test conditions Min. Typ. Max. Unit 40. Voltage controlled oscillator (VCO) 40.1 fVCOmin Min. VCO frequency - 160 - - MHz 40.2 fVCOmax Max. VCO frequency - - - 260 MHz fVCO= 200 MHz, Δf=1 kHz, B = 1 Hz, Qloaded=60 - 80 - dBc/√Hz - 10.25 - MHz 110 - - dBc/√Hz 40.3 C/N Carrier-to-noise-ratio 41. Crystal oscillator 41.1 fxtal Crystal frequency - 41.2 C/N Carrier-to-noise-ratio fxtal =10.25 MHz, Δf=10 kHz 41.3 V29 Oscillator output voltage - - 400 - mVrms 41.4 C29-32 Input capacitance - - 2.5 - pF 41.5 Cstep Min. cap. Step XTAL - 0.75 - pF 41.6 Cmax Max. cap. XTAL - 23.25 - pF 41.7 Δf/f Deviation versus VCC Δ VCC=1 V - 1.5 - ppm/V 41.8 Δf/f Deviation versus T -40 °C<T<+85 °C - 0.2 - ppm/K - 50 - μA - 50 - μA - 550 - μA - 500 - μA - 1 - mA - 1 - mA - 1.9 - mA - 1.9 - mA 42. Charge pump current 42.1 -I20 Source current 42.2 I20 Sink current 42.3 -I20 Source current 42.4 I20 Sink current 42.5 -I20 Source current 42.6 I20 Sink current 42.7 -I20 Source current 42.8 I20 Sink current V20 = 2.5 V ICP, V20 = 2.5 V ICP, V20 = 2.5 V 43. Loop filter input/output 43.1 -IIN Input leakage current VIN = GND: PDOUT = Tristate -0.1 - 0.1 μA 43.2 IIN Input leakage current VIN = VREF1 PDOUT = Tristate -0.1 - 0.1 μA 43.3 VOL Output voltage Low IOUT = -0.2 mA - 0.05 0.5 V 43.4 VOH Output voltage High IOUT = 0.2 mA - V 43.5 IOUT Output current, sink VOUT = 1 V to VCCVCO-1 V - - 10 mA 43.6 IOUT Output current, source VOUT = 1 V to VCCVCO-1 V -10 - - mA 24/77 Doc ID 16048 Rev 1 VCCVCO- VCCVCO0.5 0.05 TDA7541B Table 9. Electrical specifications and characteristics PLL section (continued) Item Symbol Parameter Test conditions Min. Typ. Max. Unit 0.5 - VVCO0.5 V 44. Output of tuning voltage (TV) 44.1 VOUT Output voltage - 44.2 IVstepI Min. voltage step TVO - 25 - mV 44.3 IVmaxI Max. voltage offset TVO - 3175 - mV 44.4 ΔV Additional offset voltage TVM=1, TVO+ - 3.175 - V 44.5 ROUT Output impedance TVM=0 - 40 - kΩ 44.6 ROUT Output impedance TVM=1 - 20 - kΩ 45. SSTOP output (open collector) 45.1 V24 Output voltage low I24 = -200 μA - 0.2 0.5 V 45.2 V24 Output voltage high - - - 5 V 45.3 -I24 Output leakage current V 24 = 5 V -0.1 - 0.1 μA 45.4 I24 Output current, sink V 24 = 0.5 V to 5 V - 1 mA 45.5 Internal unfiltered field V37SSTH strength threshold for SSTOP=HIGH SSTH, FMON=1 2.6 - 4.1 V 45.6 Internal unfiltered field V27SSTH strength threshold for SSTOP=HIGH SSTH, FMON=0 SL = “011” 1.2 - 4.8 V 46. Switch output 46.1 VOL Output Voltage low SWM”1”,SW”0”, I24 = -5 µA - 0.35 0.5 V 46.2 VOH Output Voltage high SWM”1”,SW”1” - VCC-1 - V 46.3 -I22 Output leakage current V22=5 V -0.5 - 0.5 μA 46.4 I22 Output Current, sink - - - 7 mA 46.5 VOL Output Voltage low SWM”0”,SW”0”, I22=0 µA - 0.1 0.3 V 46.6 VOH Output Voltage high SWM”0”,SW”1”, I22=1 mA - VCC-1 - V 46.7 I22 Output Current, sink V22=5 V -7 - - mA Doc ID 16048 Rev 1 25/77 Functional description TDA7541B 4 Functional description 4.1 FM part 4.1.1 Mixer 1 AGC and IF amplifier FM quadrate I/Q-mixer converts FM RF to IF1 of 10.7 MHz. The mixer provides inherent image rejection and wide dynamic range with low noise and large input signal performance. For accurate image rejection the phase-error of I/Q can be compensated by software (PH). It is capable of tuning the US FM, US weather (dedicated WB input), Europe FM, Japan FM and East Europe FM bands: – US FM = 87.9 to 107.9 MHz – US weather = 162.4 to 162.55 MHz – Europe FM = 87.5 to 108 MHz – Japan FM = 76 to 91 MHz – East Europe FM = 65.8 to 74 MHz The AGC operates on different sensitivities and bandwidths in order to improve the input sensitivity and dynamic range. AGC thresholds are programmable by software (RFAGC, IFAGC, and KAGC). The output signal is a controlled current for pin diode attenuator. A 10.7 MHz programmable amplifier (IFG) correct the IF ceramic insertion loss and the costumer level plan application. 4.1.2 Mixer2, limiter, FM demodulator and spike cancellation In the 2nd mixer stage the first 10.7 MHz IF is converted into the second 450 kHz IF. The fully integrated sample and hold FM demodulator including spike cancellation (DSB) converts the IF signal from the 450 kHz limiter (limiter gain 80 dB typ.) to the FM multiplex output signal with very low distortion. The sensitivity of spike blanking can be set via I2C bus. 4.1.3 Quality detection and ISS Field strength Parallel to mixer2 input a 10.7 MHz limiter generates a signal for digital IF counter and field strength voltage VFSUint. This internal voltage VFSUint is used for AM IF noise blanker, adjacent channel and multi path detection and is available at PIN27 (FSU) in a range of 0 V to 5 V. The offset and slope of FSU signal can be adjusted via I2C bus (FSWO and SL) for application adaptation. The voltage VFSWO including offset adjust is externally filtered at PIN37 (FSWO) and used for weak signal mute function and generation of ISS filter control signals in weak signal condition. It is possible to combine the IF counter result with this voltage VFSWO by programmable comparator threshold (SSTH). 26/77 Doc ID 16048 Rev 1 TDA7541B Functional description Adjacent channel detector The input of the adjacent channel detector is AC coupled from VFSW. A programmable high-pass or band-pass (ACF) as well as rectifier generate a signal which is compared with adjustable threshold (ACTH). The output signals of this comparator is controlling the charge and discharge of the external capacitor at PIN30 or PIN31 (dependent on SEEK) with programmable discharge current (TISS). The level at PIN30/31 is used to generate the two digital signal ac and ac+ for ISS control. The adjacent channel information behind the rectifier is available as analog output signal at the multiplexer output (PIN23). Multipath detector The input of the multi path detector is AC coupled from internal VFSW too. After filtering with 19 kHz band-pass and rectifying, this voltage is compared with an adjustable threshold (MPTH). The output signal of this comparator can be used to switch off the adjacent channel detection. This influence is selectable by I2C bus (MPENA). The multi path information behind the rectifier is available as analog output signal at multiplexer output (PIN23). 450 kHz IF narrow band pass filter (ISS filter) The device has an additional 450 kHz IF narrow band-pass filter for suppression of noise and adjacent channel signal influences. This narrow filter has three switchable bandwidths, narrow range of 80 kHz, mid range of 120 kHz and 22 kHz for weather band information. Without ISS (Intelligent Selectivity System) filter the IF bandwidth (wide range) is defined only by ceramic filter chain and mixer2 bandwidth. The filter is located between mixer2 output buffer and 450 kHz limiter stage. The centre frequency is matched to the demodulator centre frequency. Deviation detector In order to avoid distortion in audio output signal the narrow ISS filter is switched OFF if over deviation is present. Hence the demodulator output signal is detected. After AC coupling, low-pass filtering and peak rectifying this signal is charging/discharging the external DEVTC capacitor by an IIC programmable charge/discharge current (TDEV). The voltage at DEVTC is compared with adjustable thresholds (DWTH, DTH) and generates two digital control signals (dev, dev+). For weak signal condition the deviation threshold depends on FSWO. ISS switch logic All digital control signals coming from adjacent channel detector, deviation detector and weak signal mute are acting via switching matrix on ISS filter switch. IF2 narrow band-pass switch mode is controlled also by software (ISSENA, ISSON, WBON, ISSBW, and BWDEF). The switching of the IF band-pass is also possible to influence by external manipulation of DC voltage at PIN30. The influence of the ISS software control on the functionality of the ISS filter is described in Table 10. The value “X” for the control bit means the bit does not influence the filter control in this condition. Doc ID 16048 Rev 1 27/77 Functional description TDA7541B ISS filter control by I2C bus Table 10. ISSENA adr4/d2 ISSON adr11/d0 ISSBW adr7/d0 WBON adr11/d1 ISSM adr9/d7 BWDEF adr7/d1 I2C control bits 0 X X X X X ISS filter is switched off (bypass) 1 1 0 X X X ISS filter is in manual control mode, Band width is 120 kHz 1 1 1 X X X ISS filter is in manual control mode, Band width is 80 kHz 1 1 X 1 X X ISS filter is in manual control mode, Band width is 22 kHz This setting must be used for weather band application 1 0 X X 0 0 ISS filter is in automatic control mode Filter activation and band width defined by control table mode1 1 0 X X 1 0 ISS filter is in automatic control mode Filter activation and band width defined by control table mode2 1 0 0 X 0 1 ISS filter is in automatic control mode Filter activation defined by control table mode1 band width fixed to 120 kHz 1 0 0 X 1 1 ISS filter is in automatic control mode Filter activation defined by control table mode2 band width fixed to 120 kHz 1 0 1 X 0 1 ISS filter is in automatic control mode Filter activation defined by control table mode1 band width fixed to 80 kHz 1 0 1 X 1 1 ISS filter is in automatic control mode Filter activation defined by control table mode2 band width fixed to 80 kHz Notes Description of I2C bits: ISSENA ISS filter enable “1”: ISS filter control enabled “0”: ISS filter is switched off (bypass of the filter, wide) ISSON ISS filter control mode “1”: ISS filter is in manual control mode (switched "ON"); the bits ISSBW and WBON are defining the bandwidth “0”: ISS filter is in automatic control mode according to mode1/2 table ISSBW ISS filter band width “1”: 80 kHz 28/77 Doc ID 16048 Rev 1 TDA7541B Functional description “0”: 120 kHz The bit has only influence if bit BWENA is “1”, or if bit ISSON is “1” WBON Weather band enable “1”: Weather band enable (FMmixer1 is disabled, Wbmixer1enabled, stereo decoder gain 26dB, ISS filter bandwidth 22 kHz, IF2Q=”00”) “0”: Weather band disable For weather band enable it is need to set ISSON = “1” ISSM ISS filter application mode “0”: ISS filter application mode1 “1”: ISS filter application mode2 If BWENA is “1” the band width is always switched to ISSBW in case of ISS filter activated BWDEF Enable bit ISSBW for ISS filter band with control “1”: ISS filter is internally controlled, but band width is defined by bit ISSBW “0”: ISS filter is internally controlled, band width is defined by mode1/2 table For the internal control two application modes are available (ISSM). The conditions and settings are described in Table 11 and Table 12. 4.1.4 Block diagram quality detection principle (without overdeviation correction) Table 11. Signal Internal ISS control signals Low High Ac No adjacent channel Adjacent channel present ac+ No strong adjacent channel Adjacent channel higher as ac Sm Field strength higher as weak signal mute threshold Field strength lower as weak signal mute threshold Dev Deviation lower as threshold DWTH Deviation higher as threshold DWTH dev+ Deviation lower as threshold DTH*DWTH Deviation higher as threshold DTH*DWTH Inton ISS filter off by logic (wide) ISS filter on by logic int80 ISS filter 120 kHz (mid) ISS filter 80 kHz (narrow) Doc ID 16048 Rev 1 29/77 Functional description Table 12. TDA7541B ISS control modes Input signals 4.1.5 Mode1 Mode2 ac ac+ sm dev dev+ inton int80 Function inton int80 Function 0 0 0 0 0 0 0 wide 0 0 wide 0 0 0 1 0 0 0 wide 0 0 wide 0 0 0 1 1 0 0 wide 0 0 wide 0 0 1 0 0 1 1 narrow 1 1 narrow 0 0 1 1 0 0 0 wide 1 0 mid 0 0 1 1 1 0 0 wide 0 0 wide 1 0 0 0 0 1 1 narrow 1 0 mid 1 1 0 0 0 1 1 narrow 1 1 narrow 1 0 0 1 0 1 0 mid 1 0 mid 1 1 0 1 1 1 0 mid 1 1 narrow Strong adjacent channel correction Under strong adjacent channel it is possible to have disturbance of the audio signal created by interference between ISS filter control (deviation detection) and adjacent channel mute. The control bits SACCE and SACCT can be used to avoid this disturbance. If the function is activated (SACCE = “1”) the IF counter together with the internal field strength is used to suppress a malfunction of deviation detection. The bit SACCT is changing the sensitivity of the SACC block (SACCT = “1” means higher sensitivity). Figure 10 shows the ISS block diagram including the SACC function. Note: The IF counter must be switched ON if this function is used (Addr25D4 = “1”) 4.1.6 Weak signal mute The filtered field strength signal (FSWO) is the reference for soft slope mute control in weak signal condition to eliminate audible effects. The start point and mute depth are programmable (WMTH, WMD) in a wide range. These settings together with FSWO bits are influencing the weak signal mute behavior. The time constant is defined by external capacitance at PIN 42. Additional adjacent channel mute function is supported. A high pass filter with -3 dB threshold frequency of 100 kHz, amplifier and peak rectifier generates an adjacent noise signal from Demodulator output. This value is compared with adjustable threshold (ACMTH). For present strong adjacent channel the MPX signal is additional attenuated (ACMD) and has the same time constant as weak signal mute. 30/77 Doc ID 16048 Rev 1 TDA7541B 4.1.7 Functional description Weather band input If the weather band input is used the chip must be set in FM mode (FMON). In addition to that the ISS filter must be switched ON (ISSENA=”1”), mixer2 quality factor must be set to IF2Q=”00” and the ISS filter must be set in manual control mode (ISSON=”1”). The bit WBON is: ● activating the WB input ● switching the ISS filter in WB mode (22 kHz band width) ● switching the stereo decoder InGain to 26 dB. In order to increase the selectivity in weather band mode the AM 450kHz ceramic filter can be used in series to the ISS filter by activating ADSEL (please refer to Figure 10, ISS block diagram and Section 4.2.1, usage of bit ADSEL). 4.2 AM section signals, narrow band information (DAGC) referred to PIN 56, up conversion signal (IFAGC) at PIN 61 and wide band information (RFAGC) at PIN 3.This gain control gives two output signals. The first one is a current for pin diode attenuator and the second one is a voltage for preamplifier. Time constant of RF and IF-AGC is defined by internal 100 kΩ resistor and external capacitor at PIN 54. The intervention points for AGC (DAGC, IFAGC and RFAGC) are programmable by software. The oscillator frequency for upconversion-mixer1 is generated by dividing the VCO frequency after VCO divider (VCOD) and AM pre-divider (AMD). Two 10.7 MHz ceramic filters before mixer2 input increase 900 kHz attenuation. The AMIF2 block contains mixer2, IF2 amplifier, demodulator and AGC2 The AM/FM mixer2 converts 10.7 MHz IF1 into 450 kHz IF2. Mixer2 output passes a 450 kHz narrow band filter (LC plus ceramic filter). LC centre frequency is adjustable by I2C bus (IF2A). The following IF2 amplifier provides signal for fully integrated demodulator. If the bit ADSEL is activated, the ISS filter is inserted between IF2 amplifier and demodulator in order to increase the selectivity (please refer to Figure 11, AM path block diagram and Section 4.2.1, usage of bit ADSEL). Mixer2 and IF2 amplifier have a 2-stage AGC with careful take-over behavior to keep distortion low. The IF2 AGC range is about 55 dB. The input signal of IF2 amplifier is used in limiter circuit for in-band level detection. The electrical characteristics are described in FM section. The demodulator is a peak detector to generate the audio output signal. At the MUX output the AMIF stereo is available. AM IF noise blanker In order to remove in AM short spikes a noise cancellation conception is used in 450 kHz IF AM level. The advantage is to avoid long narrow AGC- and demodulator- time constants, which enlarge spike influences on audio signal and makes difficult to remove it in audio path. The 10.7 MHz AM IF signal behind IF1 amplifier generates via limitation an unweighted field strength signal including slope of noise spike. The comparison of this detected slope between fast and slow rectifier ignores audio modulation whereby the threshold of slow Doc ID 16048 Rev 1 31/77 Functional description TDA7541B rectifier is programmable (AINBT). A comparator activates a pulse generator. The duration of this pulse is software programmable (AINT) and is smooth blanking out the spikes in mixer2. 4.2.1 Usage of control bit ADSEL (Addr23D7) The control bit ADSEL can be used to increase the selectivity of the application in AM mode and WB mode. In FM it has no function. Table 12 shows the functionality of the control bit. Table 13. FMON Usage of ADSEL WBON ADSEL Note Addr4D7 Addr11D1 Addr23D7 1 0 X Standard FM mode 1 1 0 Weather band mode using 450 kHz ceramic filter; ISS filter must be manually switched on in order to limit the band width at 450 kHz IF (ISSENA/ISSON = "1"); 450 kHz ceramic filter is switched in series to ISS filter to increase selectivity 1 1 1 Standard weather band mode; ISS filter must be manually switched on in order to limit the band width at 450 kHz IF (ISSENA/ISSON = "1") 0 0 0 Standard AM mode 0 0 1 AM mode using ISS filter; ISS filter (22 kHz band width) is switched in series to the 450 kHz ceramic filter 0 1 X Not allowed 4.3 Stereo decoder 4.3.1 Decoder The stereo decoder-part of the TDA7541B contains all functions necessary to demodulate the MPX-signal, like pilot tone-dependent MONO/STEREO switching as well as the stereo blend and high cut. Adaptations like programmable input gain, roll-off compensation, selectable de-emphasis time constant and a programmable field strength input allow easy adoption to different applications. The 4th order input filter has a corner frequency of 80 kHz and is used to attenuate spikes and noise and acts as an anti-aliasing filter for the following switch capacitor filters. Demodulator In the demodulator block the left and the right channel are separated from the MPX-signal. In this stage also the 19 kHz pilot tone is canceled. For reaching a high channel separation the TDA7541B offers an I2C bus programmable roll-off adjustment, which is able to compensate the low pass behavior of the tuner section. Within the compensation range an adjustment to obtain about 40 dB channel separation is possible. The bits for this adjustment are located together with the level gain adjustment in one byte. This gives the 32/77 Doc ID 16048 Rev 1 TDA7541B Functional description possibility to perform an optimization step during the production of the car radio where the channel separation and the field strength control are trimmed. In addition to that the FM signal can be inverted. De-emphasis and high cut The de-emphasis low pass allows to choose between a time constant of 50 µs/75 µs (DEEMP). The high cut control range will be in both cases THC = 2 x TDeemp. Inside the high cut control range (between VHCHT and VHCLT) the LEVEL signal is converted into a 5-bit word, which controls the low pass time constant between TDeemp...3 x TDeemp. Thereby the resolution will remain 5 bits referred to the voltage range between the VHCHT- and minimum VHCLT-values. The high cut function can be switched off by I2C-bus. Figure 3. Programming of HC filter High Cut Filter Time Constant 00 3*TDeemp 11 HCMax 01 TDeemp VFSTC* LG VHCLT VHCHT In AM mode (FMON = 0) the DEEMP bit together with the AM corner frequency bits (AMCF) can be used as programmable AM frequency response. The maximum corner frequency is defined by TDeemp, the minimum is defined by 3 x TDeemp For the over all frequency response it is need to take into account the frequency response of the AF output at MPXOUT and the Stereo decoder demodulator too. 19 kHz PLL and pilot tone detector The PLL has the task to lock on the 19 kHz pilot tone during a stereo-transmission to allow a correct demodulation. The included pilot tone-detector enables the demodulation if the pilot tone reaches the selected pilot tone threshold VPTHST. Two different thresholds are available. The status of the detector output can be checked by reading the status byte of the TDA7541B via I2C bus or by reading the STEREO status at MUX pin23. Field strength control The field strength input is used to control the high cut- and the stereo blend-function. In addition the signal can be also used to control the noise blanker thresholds and as input for the multipath detector. Level input and gain As level input for the stereo decoder is used the FSU voltage (pin 27). Applying a capacitor at FSTC (pin28) a desired time constant can by reached together with the internal resistor of Doc ID 16048 Rev 1 33/77 Functional description TDA7541B 10k between FSU pin and FSTC pin. The second stage is a programmable gain stage to adapt the VFSTC signal internally. The gain (LG) is widely programmable in 16 steps from 0 dB to 8.25 dB (step=0.55dB). These 4 bits are located together with the Roll-Off compensation bits in byte 14 to simplify a possible adaptation during the production of the car radio. Stereo blend control The stereo blend control block converts the internal LEVEL-voltage into a demodulator compatible analog signal, which is used to control the channel separation between 0dB and the maximum separation. Internally this control range has a fixed upper limit, which is the internal reference voltage VREF1. The lower limit can be programmed between 29 and 58 % of VREF1 in 4 % steps. In order to adjust the external voltage VFSTC to the internal control range two values must be defined: the Level gain LG and VSBL. Full channel separation is reached when the internal level voltage (VST) becomes bigger than VREF1. Therefore the following equation can be used to estimate the gain: V REF1 LG = ---------------------------------------------------V FSTC @ fullstereo The MONO-voltage VMO (0dB channel separation) can be chosen selecting SBC. Figure 4. Programming of stereo blend High cut control The high cut control set-up is similar to the stereo blend control set-up: the starting point VHCH can be set with 2 bits to be 42, 50, 58 or 66 % of VREF1 whereas the range can be set to be 11, 18.3, 25.7 or 33 % of VHCH. 4.3.2 Noise blanker In the automotive environment spikes produced for example by the ignition or the wipermotor disturb the MPX-signal. The aim of the noise blanker part is to cancel the audible influence of the spikes. Therefore the output of the stereo decoder is held at the actual voltage for a time between 22 ms and 38 ms (programmable). In a first stage the spikes must be detected but to avoid a wrong triggering on high frequency (white) noise a complex trigger control is implemented. Behind the trigger stage a pulse former generates the "blanking"-pulse. An own biasing circuit supplies the noise blanker in order to avoid any cross talk to the signal path. 34/77 Doc ID 16048 Rev 1 TDA7541B Functional description Trigger path The incoming FM demodulator output signal is taken in front of the weak signal mute, high pass filtered, amplified and rectified. This second order high pass filter has a cornerfrequency of 140 kHz. The rectified signal, VRECT, is low pass filtered to generate a signal called VPEAK. Noise with a frequency above 140 kHz increases the VPEAK voltage. The resulting voltage can be adjusted by use of the noise rectifier discharge current. The VPEAK voltage is fed to a threshold generator, which adds to the VPEAK voltage a DC threshold VTH. Both signals, VRECT and VPEAK+VTH are fed to a comparator, which triggers a retriggerable monoflop. The output of the monoflop activates the sample-and-hold circuit in the signal path for the selected duration. Automatic noise controlled threshold adjustment There are mainly two independent possibilities for programming the trigger threshold: 1. Low threshold in 8 steps (NBLT) 2. Noise adjusted threshold in 4 steps (NBCT). The low threshold is active in combination with a good MPX signal without any noise; the VPEAK voltage is less than 1V. The sensitivity in this operation is high. If the MPX signal is noisy (low field strength) the VPEAK voltage increases due to the higher noise, which is also rectified. With increasing of the VPEAK voltage the trigger threshold increases, too. This particular gain is programmable in 4 steps (NBCT). Figure 5. Adaptive threshold control of noise blanker VTH 1200 mV (00) 950 mV (01) 700 mV (10) 450 mV (11) Noise Controlled Trig. Threshold Min. Trig. Threshold 200 mV 8 STEPS 147 mV 0.8 V 1.5 V V Peak Automatic stereo blend controlled threshold adjustment Besides the noise controlled threshold adjustment there is an additional possibility for influencing the noise blanker trigger threshold using the bits NBFC. This influence depends on the stereo blend control. The point where the MPX signal starts to become noisy is fixed by the RF part. This point is also the starting point of the normal noise-controlled trigger adjustment. But in some cases the noise blanker can create a wrong triggering, which create distortion, already in the region of mono/stereo transition. Therefore an opportunity to control the VPEAK voltage by the stereo blend function it is implemented. Doc ID 16048 Rev 1 35/77 Functional description Figure 6. TDA7541B Stereo blend controlled threshold adjust VPEAK MONO STEREO ≈ 3V 2.0V (00) 1.6V (01) 1.4V (10) NOISE 0.8V ATC_SB OFF (11) noisy signal good signal E' Automatic deviation controlled threshold adjustment If the system is tuned to stations with a high deviation the noise blanker can trigger on the higher frequencies of the modulation. To avoid this wrong behavior, which causes noise in the output signal, the noise blanker offers a deviation-dependent threshold adjustment. By rectifying the MPX signal a further signal representing the actual deviation is obtained. It is used to increase the PEAK voltage. The gain of this circuit is programmable in 3 steps (NBDC) of the stereo decoder-byte (the first step turns off the detector). Figure 7. Deviation controlled threshold adjust VPEAK [VOP] 00 2.0 01 1.5 10 1.0 11 0.8 20 32.5 45 75 Detector off DEVIATION [KHz] Multipath influence on noise blanker To react on high repetitive spikes caused by a Multipath-situation, the discharge-time of the VPEAK voltage can be decreased depending on the voltage-level at Pin MPTC. There are two ways to do this. 36/77 a) Switch on the linear influence of the Multipath-Level on the PEAK-signal. In this case the discharge slew rate is 1 V/ms. The slew rate is measured with RDischarge = infinite and VMPTC = 2.5 V b) Activate a function, which switches to the 18k discharge resistor if the MultipathLevel is below 2.5 V. If multipath influence on noise blanker is switched ON than MPF bit has to be set to 0. Doc ID 16048 Rev 1 TDA7541B Functional description Noise blanker in AM mode In AM mode the noise blanker is activated if a spike on the audio signal is bigger than a fixed threshold. In order to blank the whole spike in AM mode the hold time of the S&H circuit is much longer than in FM mode (64 0µs -1,2 ms). It is not recommended to use the AM noise blanker without to use the AMIF noise blanker inside the tuner. 4.3.3 Functional description of the multipath detector Using the internal multi path detector the audible effects of a multi path condition can be minimized. A multi path condition is detected by rectifying the 19 kHz spectrum in the field strength signal. An external capacitor is used to define the attack- and decay-times. The MPTC pin is used as detector output connected to a capacitor. Using this configuration an external adaptation to the user's requirement is possible without affecting the "normal" field strength input (FSTC) for the stereo decoder. To keep the old value of the multi path detector during an alternative frequency jump, the MPFAST bit can disconnect the external capacitor. Selecting MPINT the channel separation is automatically reduced during a multipath condition according to the voltage appearing at the MPTC pin. To obtain a good multipath performance an adaptation is necessary. Therefore the gain of the 19 kHz band pass is programmable in four steps (MPG) and the rectifier gain is programmable in four steps (MPRG). The attack- and decay-times can be set by the external capacitor value and the multipath detector charge current MPCC. 4.3.4 Quality detector The TDA7541B offers a quality detector output, which gives a voltage representing the FMreception conditions. To calculate this voltage the MPX-noise and the multipath-detector output are summed according to the following formula: V Qual = 0.8 ⋅ b ⋅ ( V PEAK – 0.8 ) + a ⋅ ( V REF1 – V MPTC ) The VPEAK signal is described in noise blanker session. The factor 'a' can be programmed from 0.6 to 1.05 (QDC) and the factor b can be programmed from 6 dB to 15 dB (QNG). The quality output voltage can be read at the MUX pin. The MUX pin is a low impedance output and is able to drive external circuitry as well as simply fed to an AD-converter for RDS applications. 4.3.5 AFS control and stereo decoder mute In case of AFS (alternative frequency search) jump it is recommended to set the stereo decoder in mute condition (SDM) and in addition to set the SEEK mode. Since these two bits are placed in the first written byte, this can be done in the same write cycle as the PLL jump. The stereo decoder mute is high impedance mute, which means the charge on the coupling capacitor will be kept. Simultaneously the pilot detector circuit of the stereo decoder is switched into hold mode. The SEEK mode is switching the multi path detector into fast mode. The external capacitor at MPTC is disconnected from multipath detector which keeps the stereo blend condition, but makes the quality information in fast mode available at the MUX pin. Doc ID 16048 Rev 1 37/77 Functional description TDA7541B 4.4 PLL and IF counter section 4.4.1 PLL frequency synthesizer block This part contains a frequency synthesizer and a loop filter for radio tuning system. Only one VCO is required to build a complete PLL system for FM world tuning and AM up conversion. VCO and dividers The varactor tuned LC oscillator together with the dividers provides the local oscillator signal for both AM and FM front-end mixers. The VCO has an operating frequency of approximately 160 MHz to 260 MHz. In FM mode the VCO frequency is divided (VCOD) by 1, 2 or 3. These dividers generate in-phase and quadrature-phase output signals using in FM mixer for image rejection. In AM mode the divided VCO frequency is additional pre-divided (AMD) by 4, 6, 8 or 10 dependent on selected AM band. PLL frequency generation for phase comparison The VCO divided signals applies a two modulus counter (32/33), which is controlled by a 5bit A-divider. The 5-bit register (PC0 to PC4) controls this divider. In parallel the output of the swallow counter is connected to an 11-bit B-divider. The 11-bit PC register (PC5 to PC15) controls this divider. Dividing range behind VCO divider: ƒ VCOdiv = [ 32 ⋅ B + A + 32 ] ⋅ ƒ REF Warning: For correct operation: A ≤ 32; B ≥ A Crystal oscillator The crystal oscillator provides 10.25 MHz signal for conversion from IF1 to IF2 as well as switching signals for ISS- and quality detection filter. Furthermore reference dividers generate from adjustable crystal frequency (XTAL) reference frequencies for the tuning PLL, IF counter and FM demodulator. The various reference frequencies fREF of PLL (RC) can be chosen by IIC-bus. Three state phase comparator The phase comparator generates a phase error signal according to phase difference between fSYN and fREF. This phase error signal drives the charge pump current generator. Charge pump current generator This system generator signed pulses of current. The phase error signal decides the duration and polarity of those pulses. The current absolute values are programmable by register ICP. In lock detector After reaching a phase difference about lower than 40 ns the inlock detector is automatically switching the charge-pump in low current mode (LDENA). 38/77 Doc ID 16048 Rev 1 TDA7541B Functional description Low noise CMOS op-amp An internal voltage divider at pin 19 connects the positive input of the low noise op-amp. The charge pump output connects the negative input. This internal amplifier in cooperation with external components can provide an active filter. The negative input is switchable to two input pins, to increase the flexibility in application. While the high current mode is activated LPHC output is switched on. Antenna DAC For tuning of FM antenna tank circuit two different modes are available (TVM). One is the auto-alignment measurement of VCO tuning voltage with offset of 8-bit DAC (TVO). The other one is an adjustment of 8-bit DAC independent on PLL tracking. For big differences between VCO tuning voltage and antenna tank control voltage an additional constant offset voltage can be switched to antenna circuit (TVO+). 4.4.2 IF counter block The aim of IF counter is it to measure the intermediate frequency of the tuner. The input signals are the output level of 10.7 MHz IF-limiter in FM and output level of 450 kHz IFlimiter in AM. The grade of integration is adjustable by different measuring cycle times (IFS). The tolerance of the accepted count value is adjustable too (EW), to reach an optimum compromise for search speed and precision of the evaluation. Sampling timer A sampling timer generates the gate signal for the main counter. The basically sampling time are in FM 6.25 kHz (tTIM = 160 s) and in AM 1 kHz (tTIM = 1 ms). This is followed by an asynchronous divider to generate several sampling times. Intermediate frequency main counter This counter is an 11 - 21-bit synchronous auto reload down counter. The counter length is automatic adjusted to the chosen sampling time and the counter mode (FM or AM). At the start the counter will be loaded with a defined value which is an equivalent to the divider value (tSample x fIF). If a correct frequency is applied to the IF counter frequency input at the end of the sampling time the main counter is changing its state. This is detected by control logic and an external search stop output is changing from LOW to HIGH. The IF counter is started only by the in lock information from the PLL part. 4.5 I2C bus interface The TDA7541B supports the I2C bus protocol. This protocol defines any device that sends data onto the bus as a transmitter, and the receiving device as the receiver. The device that controls the transfer is a master and device being controlled is the slave. The master will always initiate data transfer and provide the clock to transmit or receive operations. Doc ID 16048 Rev 1 39/77 Functional description TDA7541B Data transition Data transition on the SDA line must only occur when the clock SCL is LOW. SDA transitions while SCL is HIGH will be interpreted as START or STOP condition. Start condition A start condition is defined by a HIGH to LOW transition of the SDA line while SCL is at a stable HIGH level. This "START" condition must precede any command and initiate a data transfer onto the bus. The device continuously monitors the SDA and SCL lines for a valid START and will not response to any command if this condition has not been met. Stop condition A STOP condition is defined by a LOW to HIGH transition of the SDA while the SCL line is at a stable HIGH level. This condition terminates the communication between the devices and forces the bus-interface of the device into the initial condition. Acknowledge Indicates a successful data transfer. The transmitter will release the bus after sending 8 bits of data. During the 9th clock cycle the receiver will pull the SDA line to LOW level to indicate it receives the eight bits of data. Data transfer During data transfer the device samples the SDA line on the leading edge of the SCL clock. Therefore, for proper device operation the SDA line must be stable during the SCL LOW to HIGH transition. Device addressing To start the communication between two devices, the bus master must initiate a start instruction sequence, followed by an eight bit word corresponding to the address of the device it is addressing. The most significant 6 bits of the slave address are the device type identifier. The TDA7541B device type is fixed as "110001". The next significant bit is used to address a particular device of the previous defined type connected to the bus. The state of the hardwired PIN 57 defines the state of this address bit. Using this feature up to two devices could be connected on the same bus. When PIN 57 is connected to VCC via an external resistor of about 82 kΩ the address bit "1" is selected. Please note: in this case the AM part doesn't work. Otherwise the address bit "0" is selected (FM and AM is working). Therefore a double FM tuner concept is possible. The last bit of the start instruction defines the type of operation to be performed: – When set to "1", a read operation is selected – When set to "0", a write operation is selected The TDA7541B connected to the bus will compare their own hardwired address with the slave address being transmitted, after detecting a START condition. After this comparison, the TDA7541B will generate an "acknowledge" on the SDA line and will do either a read or a write operation according to the state of R/W bit. 40/77 Doc ID 16048 Rev 1 TDA7541B Functional description Write operation Following a START condition the master sends a slave address word with the R/W bit set to "0". The device will generate an "acknowledge" after this first transmission and will wait for a second word (the word address field). This 8-bit address field provides an access to any of the 32 internal addresses. Upon receipt of the word address the TDA7541B slave device will respond with an "acknowledge". At this time, all the following words transmitted to the TDA7541B will be considered as Data. The internal address will be automatically incremented. After each word receipt the TDA7541B will answer with an "acknowledge". Read operation If the master sends a slave address word with the R/W bit set to "1", the TDA7541B will transmit one 8-bit data word. This data word includes the following informations. bit0 (ISS filter, 1 = ON, 0 = OFF) bit1 (ISS filter bandwidth, 1 = 80 kHz, 0 = 120 kHz) bit2 (STEREO, 1 = STEREO, 0 = MONO) bit3 (1 = PLL is locked in, 0 = PLL is locked out). bit4 (fieldstrength indicator, 1 = lower as softmute threshold, 0 = higher as softmute threshold) bit5 (adjacent channel indicator, 1 = adjacent channel present, 0 = no adjacent channel) bit6 (deviation indicator, 1 = strong overdeviation present, 0 = no strong overdeviation) bit7 (deviation indicator, 1 = overdeviation present, 0 = no overdeviation) Doc ID 16048 Rev 1 41/77 Software specification TDA7541B 5 Software specification 5.1 Chip address and overview The interface protocol comprises: – start condition (S) – chip address byte – sub address byte – sequence of data (N bytes + Acknowledge) – stop condition (P) Receive mode S 1 1 0 0 0 1 D 0 ACK 0 0 I A4 A3 A2 A1 A0 ACK DATABYTEACK P 0 0 1 D 1 ACK R7 R6 R5 R4 R3 R2 R1 S0 ACK Transmission mode S 1 1 S = Start P = Stop 0 ACK = Acknowledge D = Device address I = Auto increment mode A = Sub address R = Read bit 42/77 Doc ID 16048 Rev 1 P TDA7541B Software specification 5.2 Address organization Table 14. Address organization Function Addr D7 D6 D5 D4 D3 D2 D1 D0 T PLL charge pump 0 SEEK T PLL counter 1 PC7 ASFC LM SDM LDENA ICP2 ICP1 ICP0 PC6 PC5 PC4 PC3 PC2 PC1 PC0 T PLL counter 2 PC15 PC14 PC13 PC12 PC11 PC10 PC9 PC8 T TV 3 TVO7 TVO6 TVO5 TVO4 TVO3 TVO2 TVO1 TVO0 T TV/IF counter 4 FMON EW6 EW5 IFS4 IFS3 ISSENA TVM TVO+ T PLL divider 5 AMD7 AMD6 RC5 RC4 RC3 VCOD2 VCOD1 VCOD0 T AGC 6 LNA7 LNA6 DAGC5 DAGC4 IFAGC3 IFAGC2 RFAGC1 RFAGC0 T Quality AC 7 TISS7 TISS6 TISS5 ACTH4 ACTH3 ACF BWDEF ISSBW T Quality ACM/MP 8 MPTH7 MPTH6 MPAC MPENA ACMD T Quality DEV 9 ISSM DTH6 DTH5 DWTH4 DWTH3 TDEV2 TDEV1 TDEV0 T Quality MUX/FSU 10 SSTH7 SSTH6 SSTH5 SSTH4 SACCT SACCE MUX1 MUX0 T Weak signal mute 11 WMD7 WMD6 WMD5 WMTH4 WMTH3 WMTH2 WBON ISSON ACMTH2 ACMTH1 ACMTH0 T AM IF NB 12 IFAGCS AINT6 AINT5 AINTH4 AINTH3 AINTH2 AINTH1 AINENA T XTAL adjust 13 SL7 SL6 SL5 XTAL4 XTAL3 XTAL2 XTAL1 XTAL0 T IF adjust 14 IF1G7 IF1G6 IF2Q5 IF2Q4 IF2A3 IF2A2 IF2A1 IF2A0 T IQ adjust/Switch 15 DSB7 DSB6 SWM SW PH3 PH2 PH1 PH0 T FM keying AGC 16 FSWO7 FSWO6 RFK KAGC4 KAGC3 KAGC2 ODCUR ODENA SD Roll off 17 LG7 LG6 LG5 LG4 ROC3 ROC2 ROC1 ROC0 SD Stereo blend 18 AMCF7 AMCF6 AMCF5 ASI PTH SBC2 SBC1 SBC0 SD High cut 19 DEEMP HCLT6 HCLT5 HCHT4 HCHT3 HCMAX2 HCMAX1 HCENA SD MP 20 MS MPFAST MPINT MPCC MPRG3 MPRG2 MPG1 MPG0 SD quality 21 NBFC7 NBFC6 NBDC5 NBDC4 QNG3 QNG2 QDC1 QDC0 SD Audio NB I 22 NBCT7 NBCT6 NBLT5 NBLT4 NBLT3 NBT2 NBT1 NBENA SD Audio NB II 23 ADSEL PCM VCON NBSMP NBMP NBRR2 NBRR1 NBPC SD Testing 24 - - - - - - - - T PLL/IFC Testing 25 EWEXP IFSEXP 1 1 1 1 1 1 T Testing 26 - - - - - - - - T Testing 27 - - - - - - - - T Testing 28 - - - - - - - - T Testing 29 - - - - - - - - Not used 30 - - - - - - - - Not used 31 - - - - - - - - T Tuner SD Stereo decoder Data bytes which are unused or dedicated for testing only don't need to be written, because they are set internally to FEH (power on reset condition). But if somebody it writing these bytes they must be written to FEH, otherwise some malfunction of the chip can happen. Doc ID 16048 Rev 1 43/77 Software specification 5.3 TDA7541B Control register function Table 15. I2C control bit description Register Name ACF ACMD ACMTH Adjacent channel detector filter select Adjacent channel mute depth Adjacent channel mute threshold ACTH Adjacent channel detector threshold ADSEL Additional selectivity AINENA AM IF noise blanker enable AINT AM IF noise blanking time AINTH AM IF noise blanker threshold AMCF Stereo decoder attenuation @ 3.5 kHz AMD AM VCO pre-divider ASFC Alternative station frequency check in FM (AGC and weak signal mute on hold) ASI BWDEF DAGC Audio signal inversion Enables bit ISSBW for ISS bandwidth control AM narrow band AGC threshold DEEMP Stereo decoder de-emphasis DSB FM demodulator spike blanker DTH Deviation detector threshold for ISS filter “OFF” DWTH Deviation detector threshold for ISS filter 120 kHz EW IF counter frequency error window EWEXP Expanded IF counter error window FMON Internal switch FM-AM mode FSWO Weighted fieldstrength with offset adjust HCENA High cut enable HCHT Start level high cut HCLT Stop level high cut HCMAX 44/77 Function Maximum high cut depth ICP Charge pump current tuner PLL IF1G IF1 Amplifier Gain IF2A IF2 LC band pass fine adjust IF2Q IF2 LC band pass quality adjust IFAGC FM/AM IF AGC threshold IFAGCS AM IFAGC threshold shift Doc ID 16048 Rev 1 TDA7541B Software specification Table 15. I2C control bit description (continued) Register Name IFS Function IF counter sampling time IFSEXP Expanded IF counter sampling time ISSBW ISS filter band width select ISSENA ISS filter enable ISSON ISS filter control mode ISSM ISS filter application mode KAGC FM keying AGC LDENA Lock detector enable tuner PLL LG Stereo decoder level gain adjust LM FM local mode enable LNA AM LNA Pin/FET mode MPAC Influence tuner multi path detection on adjacent channel behavior MPCC Stereo decoder multi path detector charge current MPENA Tuner multi path detector influence on adjacent channel enable MPFAST Fast mode of multi path information at quality pin MPG Multi path detector gain MPINT Stereo decoder multi path internal influence enable MPRG Stereo decoder multi path detector rectifier gain MPTH Tuner multi path detector threshold MS MUX NBENA Mono/Stereo switch fixed (“Forced Mono”) Output multiplexer for MUX pin Audio noise blanker enable NBCT Audio noise blanker noise controlled threshold NBDC Audio noise blanker deviation control NBFC Audio noise blanker field strength control NBLT Audio noise blanker low threshold NBMP Stereo decoder multi path influence on peak discharge current NBPC Audio noise blanker peak charge current NBRR Audio noise blanker rectifier discharge resistor NBSMP NBT Strong multi path influence on audio noise blanker Audio noise blanker time constant ODCUR Current for over deviation correction ODENA Over deviation correction enable PC Tuner PLL counter Doc ID 16048 Rev 1 45/77 Software specification Table 15. TDA7541B I2C control bit description (continued) Register Name PCM Pilot cancellation mode PH IQ mixer phase adjust PTH Pilot detector threshold QDC Stereo decoder quality detector coefficient QNG Stereo decoder quality noise gain RC RFAGC Tuner PLL reference counter FM/AM RF AGC threshold RFK FM RF keying AGC ROC Stereo decoder roll off compensation SACCT Strong adjacent channel correction threshold SACCE Strong adjacent channel correction enable SBC Stereo blend control SDM Stereo decoder mute enable SEEK FM: FMON = 1, ISS time constant change / AM: FMON = 0, AGC2 time constant change SL SSTH SW S meter slope Field strength threshold for seek stop Free programmable switch SWM Free programmable switch mode TDEV Time constant for deviation detector TISS Time constant for ISS filter “ON”/”OFF” TVM Tuning voltage offset mode TVO Tuning voltage offset TVO+ Additional fixed tuning voltage offset VCOD Tuner VCO divider VCON STD VCO “ON/OFF” WBON Weather band mode (ISS filter band width 24 kHz) WMD Weak signal mute depth WMTH Weak signal mute start point threshold XTAL 46/77 Function Xtal frequency fine adjust Doc ID 16048 Rev 1 TDA7541B Software specification 5.4 Data byte specification Table 16. Subaddress description MSB LSB Function - - - - I A4 A3 A2 A1 A0 0 0 0 0 0 Charge pump control 1 0 1 1 1 Audio noise blanker II - - - - - - 0 - - Page mode “OFF” 1 Table 17. Page mode enable Addr 0 TPLL charge pump control (0Bh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 0 0 0 Charge pump current = 50 µA 0 0 1 Charge pump current = 0.5 mA 0 1 0 Charge pump current = 1 mA 0 1 1 Charge pump current = 1.5 mA 1 1 0 Charge pump current = 3 mA 1 1 1 Charge pump current = 3.5 mA - - - ICP<2:0> - - - - - LDENA - - - - 0 1 Lock detector disable Lock detector enable SDM - - - 0 - - - - 1 Stereo decoder mute disable Stereo decoder mute enable LM - - 0 - - - - - 1 Local mode disable Local mode enable ASFC - 0 - - - - - - 1 Weak signal mute and AGC normal mode in FM Weak signal mute and AGC on hold in FM mode SEEK 0 1 - - - - - - - ISS time constant at pin 30 available, AM SEEK “OFF” ISS time constant at pin 31 available, AM SEEK “ON” Doc ID 16048 Rev 1 47/77 Software specification Table 18. TDA7541B Addr 1 TPLL Counter 1 (LSB) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 PC<7:0> 0 0 0 0 0 0 0 0 LSB = 0 0 0 0 0 0 0 0 1 LSB = 1 0 0 0 0 0 0 1 0 LSB = 2 1 1 1 1 1 1 0 0 LSB = 252 1 1 1 1 1 1 0 1 LSB = 253 1 1 1 1 1 1 1 0 LSB = 254 1 1 1 1 1 1 1 1 LSB = 255 Table 19. Addr 2 TPLL Counter 2 (MSB) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 PC<15:8> 0 0 0 0 0 0 0 0 MSB = 0 0 0 0 0 0 0 0 1 MSB = 256 0 0 0 0 0 0 1 0 MSB = 512 1 1 1 1 1 1 0 0 MSB = 64768 1 1 1 1 1 1 0 1 MSB = 65024 1 1 1 1 1 1 1 0 MSB = 65280 1 1 1 1 1 1 1 1 MSB = 65536 Note: Swallow mode: fVCO/fSYN = LSB + MSB + 32 Table 20. Addr 3 TV(00h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 TVO<7:0> 0 0 0 0 0 0 0 Tuning Voltage Offset = 0mV 0 0 0 0 0 0 1 TVO = 25 mV 0 0 0 0 0 1 0 TVO = 50 mV 1 1 1 1 1 1 0 TVO = 3150 mV 1 1 1 1 1 1 1 TVO = 3175 mV - - - - - - - 0 1 48/77 -TVO +TVO Doc ID 16048 Rev 1 TDA7541B Table 21. Addr25 Software specification Addr 4 TV/IF Counter (FM ACh, AM 1Ch) MSB LSB Function d7 d6 d7 d6 d5 d4 d3 d2 d1 d0 TVO+ - - - - - - - - - 0 Disable additional TV offset 1 Enable additional TV offset + 3.175 V TVM - - - - - - - - 0 - 1 TV is tracking with PLL TV is independing on PLL ISSENA - - - - - - - 0 - - 1 ISS Filter switched off (bypass of filter, wide) ISS filter control enable IFS<4:3> - 1 0 0 tSample = 20.48 ms (FM) 128 ms (AM) 1 0 1 tSample = 10.24 ms (FM) 64 ms (AM) 1 1 0 tSample = 5.12 ms (FM) 32 ms (AM) 1 1 0 0 0 tSample = 1.28 ms (FM) 8 ms (AM) 0 0 1 tSample = 0.64 ms (FM) 4 ms (AM) 0 1 0 tSample = 0.32 ms (FM) 2 ms (AM) 0 1 1 tSample = 0.16 ms (FM) 1 ms (AM) 1 - - - - - - tSample = 2.56 ms (FM) 16 ms (AM) EW<6:5> 1 0 0 Δf = 12.5 kHz (FM) 2 kHz (AM) 1 0 1 Δf = 25 kHz (FM) 4 kHz (AM) 1 1 0 Δf = 50 kHz (FM) 8 kHz (AM) 1 1 0 0 0 Not valid 0 0 1 Not valid 0 1 0 Not valid 0 1 1 Δf = 6.25 kHz (FM) 1 kHz (AM) 1 - - - - - - - Δf = 100kHz (FM) 16kHz (AM) FMON - - 0 - - - - - - - 1 Select AM mode Select FM mode Doc ID 16048 Rev 1 49/77 Software specification Table 22. TDA7541B Addr 5 TPLL Divider (FM 3Dh, AM 2Dh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 VCOD<2:0> - - - - - 0 0 not valid (only for testing) 0 1 VCO frequency divided by 2 1 0 VCO frequency divided by 3 1 1 original VCO frequency 0 VCO ”I” signal 0 degree 1 VCO “I” signal 180 degree RC<5:3> - 0 1 1 1 0 0 - PLL reference frequency 2 kHz PLL reference frequency 9 kHz - - - 1 0 1 PLL reference frequency 10 kHz (AM) 1 1 0 PLL reference frequency 25 kHz 1 1 1 PLL reference frequency 50 kHz (FM) AMD<7:6> 0 0 0 1 1 0 AM VCO predivider ratio 6 1 1 AM VCO predivider ratio 4 50/77 AM VCO predivider ratio 10 - - - - - - AM VCO predivider ratio 8 Doc ID 16048 Rev 1 TDA7541B Software specification Table 23. Addr 6 AGC (FM 06h, AM 2Ah) Addr12 MSB LSB Function d7 d7 d6 d5 d4 d3 d2 d1 d0 RFAGC<1:0> - - - - - - - 0 0 RFAGC threshold FM V8-10= 80 dBµV, AM V3= 92 dBµV 0 1 RFAGC threshold FM V8-10= 84 dBµV, AM V3= 99 dBµV 1 0 RFAGC threshold FM V8-10= 88 dBµV, AM V3= 102 dBµV 1 1 RFAGC threshold FM V8-10= 92 dBµV, AM V3= 104 dBµV IFAGC<3:2> 1 0 0 IFAGC threshold FM V61= 82 dBµV, AM V61= 89 dBµV 1 0 1 IFAGC threshold FM V61= 88 dBµV, AM V61= 95 dBµV 1 1 0 IFAGC threshold FM V61= 91 dBµV, AM V61= 99 dBµV 1 1 0 0 0 IFAGC threshold FM V61= 82 dBµV, AM V61= 79 dBµV 0 0 1 IFAGC threshold FM V61= 88 dBµV, AM V61= 85 dBµV 0 1 0 IFAGC threshold FM V61= 91 dBµV, AM V61= 89 dBµV 0 1 1 IFAGC threshold FM V61= 94 dBµV, AM V61= 92 dBµV 1 - - - - - - IFAGC threshold FM V61= 94 dBµV, AM V61= 102 dBµV DAGC<5:4> - - - DAGC V56= 86 dBµ 0 0 0 1 1 0 DAGC V56= 95 dBµ 1 1 DAGC V56= 98 dBµ - - - - DAGC V56= 91 dBµ LNA<7:6> - I4 = 400 µA, V54 = 4.5 V, AM LNA Pin/FET mode ”OFF” 0 0 0 1 1 0 I4 = 400 µA + 100 µA, V54 = 3.5 V 1 1 I4 = 400 µA + 100 µA, V54 = 3.5 V - - - - - - I4 = 400 µA + 50 µA, V54 = 3.5 V Doc ID 16048 Rev 1 51/77 Software specification Table 24. TDA7541B Addr 7 Quality AC (FM 50h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 ISSBW - - - - - - - 0 ISS filter fixed band width 120 kHz 1 ISS filter fixed band width 80 kHz BWDEF - - - - - - 0 - 1 Disable bit ISSBW for ISS filter band width control Enable bit ISSBW for ISS filter band width control ACF - - - - - 0 - - 1 AC highpass frequency 100 kHz AC bandpass frequency 100 kHz ACTH<4:3> - - - 0 0 AC detector threshold 0.35 V 0 1 1 0 AC detector threshold 0.55 V 1 1 AC detector threshold 0.65 V - - - AC detector threshold 0.45 V TISS<7:5> 0 0 0 discharge current 1 µA, charge current mid 74 µA, narrow 124 µA 0 0 1 discharge current 3 µA, charge current mid 72 µA, narrow 122 µA 0 1 0 0 1 1 discharge current 7 µA, charge current mid 68 µA, narrow 118 µA 1 1 1 discharge current 15 µA, charge current mid 60 µA, narrow 110 µA 52/77 - - - - - discharge current 5 µA, charge current mid 70 µA, narrow 120 µA Doc ID 16048 Rev 1 TDA7541B Table 25. Software specification Addr 8 Quality ACM/MP (FM 6Ah) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 ACMTH<2:0> - - - - 0 0 0 AC mute threshold 60 mV 0 0 1 AC mute threshold 90 mV 0 1 0 AC mute threshold 150 mV 1 1 0 AC mute threshold 240 mV 1 1 1 AC mute OFF - ACMD - - - - 0 - - - 1 Adjacent channel mute depth -4 dB Adjacent channel mute depth -6 dB MPENA - - - 0 - - - - 1 Multipath control “ON” Multipath control “OFF” MPAC - - 0 - - - - - Multipath eliminates ac (MPENA = 0) Multipath eliminates ac and ac+ (MPENA = 0) 1 MPTH<7:6> 0 0 MP threshold 0.50 V 0 1 1 0 MP threshold 1.00 V 1 1 MP threshold 1.25 V - - - - - - MP threshold 0.75 V Doc ID 16048 Rev 1 53/77 Software specification Table 26. TDA7541B Addr 9 Quality Dev (FM 49h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 TDEV<2:0> - - - - - 0 0 0 charge current 39 µA, discharge current 1 µA 0 0 1 charge current 38 µA, discharge current 2 µA 0 1 0 charge current 37 µA, discharge current 3 µA 0 1 1 charge current 36 µA, discharge current 4 µA 1 1 0 charge current 33 µA, discharge current 7 µA 1 1 1 charge current 32 µA, discharge current 8 µA DWTH<4:3> - - - 0 0 DEV threshold for ISS narrow/wide 20 kHz 0 1 1 0 DEV threshold for ISS narrow/wide 40 kHz 1 1 DEV threshold for ISS narrow/wide 50 kHz - - - DEV threshold for ISS narrow/wide 30 kHz DTH<6:5> - 0 0 DEV threshold for ISS filter “OFF” ratio 1.5 0 1 1 0 DEV threshold for ISS filter “OFF” ratio 1.3 1 1 DEV threshold for ISS filter “OFF” ratio 1 - - - - - DEV threshold for ISS filter “OFF” ratio 1.4 ISSM 0 1 54/77 - - - - - - - ISS filter application mode 1 ISS filter application mode 2 Doc ID 16048 Rev 1 TDA7541B Table 27. Software specification Addr 10 Quality MUX/FSU (FM 0Eh, AM 0Fh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 MUX<1:0> - - - - - - 0 0 Detected multipath information at PIN 23 0 1 Detected adjacent channel information at PIN 23 1 0 Quality information stereo decoder at PIN 23 1 1 FMON=1: Stereo indication at PIN 23 FMON=0: AM IF2 signal at PIN 23 - - - - - 0 1 - - SACCE Strong adjacent channel correction disable Strong adjacent channel correction enable - - - - 0 1 - - - SACCT Strong adjacent channel correction threshold = 2.9 V Strong adjacent channel correction threshold = 3.0V 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 SSTOP = H if IFC = H & FS > 0 1 0 0 SSTOP = H if IFC = H & FS > 1 1 1 1 SSTOP = H if IFC = H & FS > (FM: 4.1 V / AM: 4.8 V) SSTH<7:4> Table 28. SSTOP = IFC (IF counter status) SSTOP = H if IFC = H & FS > (FM: 0.6 V / AM: 1.2 V) - - - - SSTOP = H if IFC = H & FS > Addr 11 Weak Signal Mute (FM A8h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 ISSON - - - - - - - 0 ISS filter internal control 1 ISS filter forced “ON” - Weather band disable WBON - - - - - - 0 1 Weather band enable WMTH<4:2> - - - 0 0 0 Startpoint mute 0 0 0 1 Startpoint mute 1 0 1 0 1 1 0 1 1 1 - - Startpoint mute 2 Startpoint mute 6 Startpoint mute 7 WMD<7:5> 0 0 0 0 0 1 Mute depth 0 1 0 1 Mute depth 5 1 1 1 Mute depth 7 - - - - - Mute depth 1 Doc ID 16048 Rev 1 55/77 Software specification Table 29. TDA7541B Addr 12 AM IF NB (AM B1h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 - - - - - - - 0 1 - - 0 0 0 0 1 1 0 0 1 1 0 1 0 1 0 0 0 1 0 0 0 1 0 1 - 0 0 1 1 0 1 0 1 - - - - - - - - - - - - - - 0 1 Table 30. AINENA AM IF noise blanker disable AM IF noise blanker enable AINTH<4:1> not recommended not recommended AM IF NB Threshold 50 mV AM IF NB Threshold 62.5 mV AM IF NB Threshold 100 mV AM IF NB Threshold 187.5 mV AINT<6:5> AM IF NB Time 8 µs AM IF NB Time 11 µs AM IF NB Time 14 µs AM IF NB Time 17 µs IFAGCS Enable AM IFAGC threshold shift down (check address6) Disable AM IFAGC threshold shift down Addr 13 XTAL adjust(80h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 XTAL<4:0> - - - 0 0 0 0 0 CLoad 0pF 0 0 0 0 1 CLoad 0.75 pF 0 0 0 1 0 CLoad 1.5 pF 0 0 0 1 1 CLoad 2.25 pF 0 0 1 0 0 CLoad 3 pF 1 1 1 1 0 CLoad 22.5 pF 1 1 1 1 1 CLoad 23.25 pF SL<7:5> 0 0 0 S meter slope FM = 0.75 V/20 dB, AM = 1.61 V/20 dB 0 0 1 S meter slope FM = 0.80 V/20 dB, AM = 1.75 V/20 dB 0 1 0 0 1 1 S meter slope FM = 0.85 V/20 dB, AM = 1.89 V/20 dB - - - - - S meter slope FM = 0.90 V/20 dB, AM = 1.98 V/20 dB 1 0 0 S meter slope FM = 0.95 V/20 dB, AM = 2.04 V/20 dB 1 0 1 S meter slope FM = 1.0 V/20 dB, AM = 2.1 V/20 dB 1 1 0 S meter slope FM = 1.05 V/20 dB, AM = 2.15 V/20 dB 1 1 1 S meter slope FM = 1.1 V/20 dB, AM = 2.20 V/20 dB 56/77 Doc ID 16048 Rev 1 TDA7541B Table 31. Software specification Addr 14 IF2 adjust (FM E8h, AM 08h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 IF2A<3:0> - - - - 0 0 0 0 Cadj 0 pF 0 0 0 1 Cadj 2,2 pF 0 0 1 0 Cadj 4,4 pF 0 0 1 1 Cadj 6,6 pF 0 1 0 0 Cadj 8,8 pF 1 0 0 0 Cadj 17,6 pF 1 1 1 1 Cadj 33 pF IF2Q<5:4> - - 0 0 no Rint, AM Q=28/gain=26 dB, FM Q=28/gain=16 dB 0 1 1 0 Rint =4,1 kOhm, FM Q=2,5/gain=14 dB, BW=180 kHz 1 1 Rint =3,3 kOhm, FM Q=2,05/gain=14 dB, BW=220 kHz - - - - Rint =5 kOhm, FM Q=3/gain=14 dB, BW=150 kHz IF1G<7:6> 0 0 IF1 gain 9 dB (AM) 0 1 1 0 IF1 gain 17 dB 1 1 IF1 gain 21 dB (FM) - - - - - - IF1 gain 12 dB Doc ID 16048 Rev 1 57/77 Software specification Table 32. TDA7541B Addr 15 IQ adjust / Switch (FM E7h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 PH<3:0> - - - - 0 0 0 0 -7 degree 0 0 0 1 -6 degree 0 0 1 0 -5 degree 0 1 1 1 0 degree 1 0 0 0 1 degree 1 0 0 1 2 degree 1 1 1 0 7 degree 1 1 1 1 8 degree SW - - - 0 - - - - 1 S1 LOW output voltage S1 HIGH output voltage SWM - - 0 - - - - - 1 S1 emitter output available S1 open collector output available DSB<7:6> 0 0 0 1 1 0 Threshold for FM demodulator spike cancellation 400 mV 1 1 Threshold for FM demodulator spike cancellation 520 mV 58/77 FM demodulator spike cancellation ”OFF” - - - - - - Threshold for FM demodulator spike cancellation 630 mV Doc ID 16048 Rev 1 TDA7541B Table 33. Software specification Addr 16 FM keying AGC (FM 1Dh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 ODENA - - - - - - - 0 Over deviation correction disable 1 Over deviation correction enable ODCUR - - - - - - 0 - 1 over deviation correction current max=45 µA over deviation correction current max=90 µA KAGC<4:2> - - - 0 0 0 KAGC threshold 3,60* V48 /5 0 0 1 KAGC threshold 3,65* V48 /5 0 1 0 KAGC threshold 3,70* V48 /5 0 1 1 1 0 0 KAGC threshold 3,80* V48 /5 1 0 1 KAGC threshold 3,85* V48 /5 1 1 0 KAGC threshold 3,90* V48 /5 1 1 1 Keying AGC “OFF” - - KAGC threshold 3,75* V48 /5 RFK - - 0 - - - - - 1 RF keying AGC OFF RF keying AGC ON FSWO<7:6> 0 0 FSW offset OFF 0 1 1 0 FSW offset = -150 mV 1 1 FSW offset = -192 mV - - - - - - FSW offset = -75 mV Doc ID 16048 Rev 1 59/77 Software specification Table 34. TDA7541B Addr 17 Roll off / Level gain (77h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 ROC<3:0> - - - - 0 0 0 0 Roll-Off compensation 25.8 % 0 0 0 1 Roll-Off compensation 24.0 % 0 0 1 0 Roll-Off compensation 22.2 % 0 0 1 1 Roll-Off compensation 20.5 % 0 1 0 0 Roll-Off compensation 18.8 % 0 1 0 1 Roll-Off compensation 17.1 % 0 1 1 0 Roll-Off compensation 15.4 % 0 1 1 1 Roll-Off compensation 13.8 % 1 0 0 0 Roll-Off compensation 12.2 % 1 0 0 1 Roll-Off compensation 10.6 % 1 0 1 0 Roll-Off compensation 9.0 % 1 0 1 1 Roll-Off compensation 7.5 % 1 1 0 0 Roll-Off compensation 6.0 % 1 1 0 1 Roll-Off compensation 4.5 % 1 1 1 0 Roll-Off compensation 3,0 % 1 1 1 1 Roll-Off compensation 1.6 % LG<7:4> 0 0 0 0 Level gain 0 dB 0 0 0 1 Level gain 0.55 dB 0 0 1 0 0 1 1 1 Level gain 3.85 dB 1 1 1 1 Level gain 8.25 dB 60/77 - - - - Level gain 1.10 dB Doc ID 16048 Rev 1 TDA7541B Table 35. Software specification Addr 18 SD Stereoblend / AM corner frequency (0Dh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 SBC<2:0> - - - - - 0 0 0 Stereoblend control at 29 % REF5V 0 0 1 Stereoblend control at 33 % REF5V 0 1 0 Stereoblend control at 38 % REF5V 0 1 1 Stereoblend control at 42 % REF5V 1 0 0 Stereoblend control at 46 % REF5V 1 0 1 Stereoblend control at 50 % REF5V 1 1 0 Stereoblend control at 54 % REF5V 1 1 1 Stereoblend control at 58 % REF5V PTH - - - - 0 - - - 1 Pilot threshold high Pilot threshold low ASI - - - 0 - - - - 1 Audio inverter “OFF” Audio inverter “ON” AMCF<7:5> 0 0 0 AM attenuation @ 3.5 kHz = 8.4 dB 0 0 1 AM attenuation @ 3.5 kHz = 8.0 dB 0 1 0 1 1 0 AM attenuation @ 3.5 kHz = 4.4 dB 1 1 1 AM attenuation @ 3.5 kHz = 3.6 dB - - - - - AM attenuation @ 3.5 kHz = 7.3 dB Doc ID 16048 Rev 1 61/77 Software specification Table 36. TDA7541B Addr 19 SD High cut (2Fh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 HCENA - - - - - - - 0 High cut “OFF” 1 High cut “ON” HCMAX<2:1> - - - - - 0 0 Maximum high cut 10 dB 0 1 1 0 Maximum high cut 7.5 dB 1 1 Maximum high cut 8.5 dB - Maximum high cut 5.5 dB HCHT<4:3> - - - 0 0 Start level high cut @ 42 % REF5V 0 1 1 0 Start level high cut @ 58 % REF5V 1 1 Start level high cut @ 66 % REF5V - - - Start level high cut @ 50 % REF5V HCLT<6:5> - 0 0 Stop level high cut @ 11 % VHCHT 0 1 1 0 Stop level high cut @ 25.7 % VHCHT 1 1 Stop level high cut @ 33 % VHCHT - - - - - Stop level high cut @ 18.3 % VHCHT DEEMP 0 1 62/77 - - - - - - - De-emphasis 50 µs De-emphasis 75 µs Doc ID 16048 Rev 1 TDA7541B Table 37. Software specification Addr 20 SD MP (FM 97h, AM 3Fh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 MPG<1:0> - - - - - - 0 0 Multipath detector gain =6 dB 0 1 Multipath detector gain =12 dB 1 0 Multipath detector gain =9 dB 1 1 Multipath detector gain =10.5 dB MPRG<3:2> - - - - 0 0 Multipath detector rectifier gain =7,6 dB 0 1 1 0 Multipath detector rectifier gain =0d B 1 1 Multipath detector rectifier gain disabled - - Multipath detector rectifier gain =4,6 dB MPCC - - - 0 - - - - 1 Multipath detector charge current =0,8 µA Multipath detector charge current =0,4 µA MPINT - - 0 - - - - - 1 Multipath detector internal influence “ON” Multipath detector internal influence “OFF” MPFAST 0 - - - - - - 1 External time constant (MPTC) enable External time constant (MPTC) disable MS 0 1 - - - - - - - Forced MONO MONO/STEREO switch automatically Doc ID 16048 Rev 1 63/77 Software specification Table 38. TDA7541B Addr 21 SD Quality (FFM 7Ah, AM FAh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 QDC<1:0> - - - - - - 0 0 Quality detector coefficient a=0,6 0 1 Quality detector coefficient a=0,75 1 0 Quality detector coefficient a=0,9 1 1 Quality detector coefficient a=1,05 QNG<3:2> - - - - 0 0 Quality noise gain =6 dB 0 1 1 0 Quality noise gain =12 dB 1 1 Quality noise gain =15 dB - - Quality noise gain =9 dB NBDC<5:4> - - 0 0 Noise blanker deviation adjust 2.0 V 0 1 1 0 Noise blanker deviation adjust 1.0 V 1 1 Noise blanker deviation adjust “OFF” - - - - Noise blanker deviation adjust 1.5 V NBFC<7:6> 0 0 0 1 1 0 Noise blanker field strength adjust 1.4 V 1 1 Noise blanker field strength adjust “OFF” 64/77 Noise blanker field strength adjust 2.0 V - - - - - - Noise blanker field strength adjust 1.6 V Doc ID 16048 Rev 1 TDA7541B Table 39. Software specification Addr 22 SD NB I (FM 05h, AM 04h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 NBENA - - - - - - - 0 Audio noise blanker “OFF” 1 Audio noise blanker “ON” NBT<2:1> - - - - - 0 0 Audio noise blanking time 38 µs 0 1 1 0 Audio noise blanking time 32 µs 1 1 Audio noise blanking time 22 µs - Audio noise blanking time 25,5 µs NBLT<5:3> - - 0 0 0 Noise blanker low threshold 280 mV 0 0 1 Noise blanker low threshold 261 mV 0 1 0 Noise blanker low threshold 242 mV 0 1 1 1 0 0 Noise blanker low threshold 204 mV 1 0 1 Noise blanker low threshold 185 mV 1 1 0 Noise blanker low threshold 166 mV 1 1 1 Noise blanker low threshold 147 mV - - - Noise blanker low threshold 223 mV NBCT<7:6> 0 0 Noise blanker noise controlled threshold 1200 mV 0 1 1 0 Noise blanker noise controlled threshold 700 mV 1 1 Noise blanker noise controlled threshold 450 mV - - - - - - Noise blanker noise controlled threshold 950 mV Doc ID 16048 Rev 1 65/77 Software specification Table 40. TDA7541B Addr 23 SD NB II (FM E2h, AM C2h) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 NBPC - - - - - - - 0 Noise blanker peak charge current low 1 Noise blanker peak charge current high NBRR<2:1> - - - - - 0 0 Noise rectifier discharge resistor = infinite 0 1 1 0 Noise rectifier discharge resistor =33 k 1 1 Noise rectifier discharge resistor =18k - Noise rectifier discharge resistor =56 k NBMP - - - - 0 - - - 1 Multipath influence on peak discharge “OFF” Multipath influence on peak discharge “ON” (-3 V/ms) NBSMP - - - 0 - - - - 1 Strong multipath influence on peak discharge “OFF” Strong multipath influence on peak discharge “ON” VCON - - 0 - - - - - 1 Stereo decoder VCO “OFF” Stereo decoder VCO “ON” PCM - 0 - - - - - - 1 Pilot cancellation mode: always Pilot cancellation mode: if pilot > pilot threshold ADSEL 0 1 66/77 - - - - - - - Additional selectivity OFF Additional selectivity ON Doc ID 16048 Rev 1 TDA7541B Table 41. Software specification Addr 24, 26, 27, 28, 29 testing (FEh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 1 1 1 1 1 1 1 0 Table 42. Only for testing Addr 25 Testing (FEh) MSB LSB Function d7 d6 d5 d4 d3 d2 d1 d0 - - 1 1 1 1 1 0 Only for testing IFSEXP - 0 - - - - - - 1 Enable expand mode of IF sampling time (see addr 4) Disable expand mode of IF sampling time EWEXP 0 1 - - - - - - - Enable expand mode of error window (see addr 4) Disable expand mode of error window Doc ID 16048 Rev 1 67/77 Appendix 6 TDA7541B Appendix Figure 8. 68/77 Block diagram FM part Doc ID 16048 Rev 1 TDA7541B Appendix Figure 9. Block diagram VCO Doc ID 16048 Rev 1 69/77 Appendix TDA7541B Figure 10. Block diagram ISS function 70/77 Doc ID 16048 Rev 1 TDA7541B Appendix Figure 11. Block diagram AM path Doc ID 16048 Rev 1 71/77 Appendix TDA7541B Figure 12. Block diagram stereo decoder MPXOUT MPXIN L R MUX MPTC FSTC Figure 13. Block diagram audio noise blanker MPXIN Stereo decoder L/R NBENA Monoflop FM:22-40µs AM:0.3-1.2ms NBT S&H FMON VTH Deviation detector 140kHz HPF (2nd. order) Rectifier Integrator discharge control NBPC NBMP NBSMP NBRR MPTC 72/77 Threshold generator NBCT NBDC FMDEMOut PEAK RECT FMON Doc ID 16048 Rev 1 NBLT Fieldstrenght adjust NBFC FSTC TDA7541B Appendix Figure 14. Block diagram multi path detection for stereo decoder Stereo blend FSTC Attack/Decay MUX MPINT Rectifier MPCC FS Bandpass 19kHz internal MPFAST/ SEEK Rectifier MPG MPRG MPTC Doc ID 16048 Rev 1 73/77 AC00706 FM_AM 8.5V 22n 8.5V 10 330n 100n 16 15 14 1µ 13 12 11 10 9 8 7 6 5 4 3 2 1 10 8.5V 100n 330p VCCVCO VCOE VCOB FMAGCTC FMPINDR TV FMMIX1IN2 GNDRF FMMIX1IN1 AMPINDR AMMI X1REF WB AMRFAGCOUT AMMI X1IN DEVTC VCCMIX1 220n 64 MIX1OUT GNDVCO 17 680 nH 62 MIX1REF LPOUT 18 61 IF1AMPIN 63 GNDIF 19 LPF 20 VREF2 1µ 4.7 60 100n 1µ 100n 2.2µ 100n 100n 1 X1 450kHz CF3 51 52 180p AMI F2IN 49 GNDVCC1 L R VCC1 FSWO GNDSTD MPTC AMREFDEMC MPXI N MUTETC MPXOUT AM IF2REF FMREFDEMC GNDDEM 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 22µ 4.7 8.5V VREF1 100n Q_Loaded 28 L=560nH TDA7541B SW 22 8.5V 23 MUX MUX SSTOP 24 SSTOP VCCIF1 0.7MHz CF2 26 SDA 25 SDA SCL SCL FSU 27 FSU LPHC 21 59 IF1AMPOUT 58 IF1REF 57 AMA GC2TC 56 MIX2IN 55 MI X2INREF 54 AMRFAGCTC 53 MIX2OUT 28 FSTC 100n MIX2REF XTALG 29 VCC2 30 50 MIX2AMPOUT 31 GNDVCC2 32 ISSTC2 3.3n ISSTC1 330n Doc ID 16048 Rev 1 XTALD 74/77 1µ 100n 470n 100n 470n 2.2µ 470n L 100n 470n 22 AM _AF/MPX 8.5V 7 R 10.7MHz CF1 Application circuit TDA7541B Application circuit Figure 15. Application circuit 100p TDA7541B Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 16. LQFP64 mechanical data and package dimensions mm inch DIM. MIN. TYP. MAX. A MIN. TYP. 1.60 0.063 A1 0.05 0.15 0.002 A2 1.35 1.40 1.45 0.053 0.006 0.22 0.27 0.0066 0.0086 0.0106 0.20 0.0035 0.055 0.057 B 0.17 C 0.09 D 11.80 12.00 12.20 0.464 0.472 0.480 D1 9.80 10.00 10.20 0.386 0.394 0.401 0.0079 D3 7.50 0.295 e 0.50 0.0197 E 11.80 12.00 12.20 0.464 0.472 0.480 E1 9.80 10.00 10.20 0.386 0.394 0.401 0.45 0.60 0.75 0.0177 0.0236 0.0295 E3 7.50 L OUTLINE AND MECHANICAL DATA MAX. 0.295 L1 1.00 K 0˚ (min.), 3.5˚ (min.), 7˚(max.) 0.0393 ccc 0.080 LQFP64 (10 x 10 x 1.4mm) 0.0031 D D1 A D3 A2 A1 48 33 49 32 0.08mm ccc B Seating Plane E E1 E3 B 17 64 1 16 C e L L1 8 Package information K TQFP64 0051434 F Doc ID 16048 Rev 1 75/77 Revision history 9 TDA7541B Revision history Table 43. 76/77 Document revision history Date Revision 22-Jul-2009 1 Changes Initial release. Doc ID 16048 Rev 1 TDA7541B Please Read Carefully: Information in this document is provided solely in connection with ST products. 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The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2009 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com Doc ID 16048 Rev 1 77/77