Features • Two Alignment-free PLL FM Demodulators, Automatic Lock-in on the Received Sound • • • • • • Carrier Frequency Mono and Dual Channel Application Sound IF Inputs Provided for Ceramic Filters Automatic Mute for Second Sound Channel (Squelch) Mute Function for Both Sound Channels 5-V Supply Voltage, Low-power Consumption Few External Components Description The U2860B-M is a dual-channel FM sound demodulator realized with Atmel ’s advanced bipolar process. All TV FM standards, from 4.5 MHz up to 6.5 MHz (standard M, B/G, I, D/K) can be processed with high performance. The circuit is alignment-free and has a minimum number of external components. With 5 V supply voltage, the U2860B-M is suitable for TV, VCR and multimedia applications. Dual-Channel FM Sound Demodulator for TV Systems U2860B-M Figure 1. Block Diagram VS Cstab 13 12 8 11 Supply Vin1 Mute 1 3 7 VCO 1 Mute VAF1 Loop filter 1 10 VCO offset VCO offset Rref (optional) Vin2 Squelch 14 VCO 1 Loop filter 2 6 4 VAF2 Squelch Squelch (second carrier) 9 Rev. 4794A–TVVCR–02/04 Pin Configuration Figure 2. Pinning Vin1 NC Vmute Vsque NC VAF2 VAF1 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Vin2 VS GND Cstab Rref C9 C8 Pin Description 2 Pin Symbol 1 Vin1 Intercarrier input of sound channel 1 (5.5 MHz) Function 2 NC Not connected 3 Vmute Mute for sound channel 1+2 “on/off” 4 Vsque Automatic mute for 2nd sound channel (squelch) “on/off” 5 NC Not connected 6 VAF2 Audio output AF2 of sound channel 2 7 VAF1 Audio output AF1 of sound channel 1 8 C8 Decoupling capacitor for sound channel 1 9 C9 Decoupling capacitor for sound channel 2 10 Rref VCO offset of the free-running frequency 11 Cstab Internal supply voltage stabilization 12 GND Ground 13 VS Supply voltage 14 Vin2 Intercarrier input of sound channel 2 (5.74 MHz) U2860B-M 4794A–TVVCR–02/04 U2860B-M Circuit Description The U2860B-M includes two identical sound IF channels. Each consists of a limiter amplifier, PLL FM demodulator and AF amplifier. Additionally, this circuit contains a squelch function, mute switch and internal voltage regulation. Limiter Amplifiers The intercarrier signals are fed through external ceramic bandpass filters to a 7-stage limiter amplifier. This guarantees high input sensitivity and excellent AM suppression. PLL FM Demodulators The alignment-free Phase Locked Loop (PLL) demodulator covers a wide frequency range of 4.5 MHz up to 6.5 MHz with low-noise performance. The linear voltage to frequency characteristic results in low harmonic distortion. The free-running frequency of the internal VCO circuit is about 5.5 MHz. For this frequency, the input sensitivity and VCO locking is optimal. An additional external resistor at pin 10 allows a frequency shift of ±1 MHz via an internal offset current. With this option, it is possible to shift the optimum conditions to the upper frequency (6.5 MHz) or to the lower frequency (4.5 MHz). The offset current acts simultaneously on both VCO circuits. If no resistor is connected, the offset current is disabled. Audio Amplifiers The demodulated signals are amplified to 500 mVrms with low output impedance at the audio outputs (pin 6 and pin 7). AC decoupling at pin 8 and pin 9 of the audio amplifiers leads to high common mode rejection. Squelch Function For channel 2 the audio output amplifier and VCO2 is muted automatically (squelch) when the second sound carrier is not present. This avoids a wrong identification for stereo and dual sound in the stereo decoder. Therefore, with mono sound, there is no output signal at pin 6. The automatic squelch function can be disabled by switching pin 4 to ground. Mute Switch Simultaneous muting of both circuits is possible by switching pin 3 to ground. Internal Voltage Stabilizer The internal bandgap reference ensures constant performance independent of supply voltage and temperature. 3 4794A–TVVCR–02/04 Absolute Maximum Ratings Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Reference point pin 12, unless otherwise specified. Parameters Pin Symbol Value Unit Supply voltage 13 VS 9.0 V Supply current 13 IS 33 mA P 300 mW 6, 7 Iout ±1.5 mA 1, 14 3, 4 6, 7, 8, 9, 10, 11 Vext Vext Vext 2.0 VS 4.5 V V V V Tj +125 °C Tstg -25 to +125 °C VESD ±200 V Symbol Value Unit RthJA 90 K/W Symbol Value Unit VS 4.5 to 9.0 V Tamb 0 to 85 °C Power dissipation VS = +9 V Output currents External voltages Junction temperature Storage temperature Electrostatic handling Notes: (1) all pins 1. Machine model in accordance with ESD S5.2 standard. Thermal Resistance Parameters Junction ambient when soldering to PCB Operating Range Parameters Supply voltage range, pin 13 Ambient temperature 4 U2860B-M 4794A–TVVCR–02/04 U2860B-M Electrical Characteristics VS = 5 V, Tamb = 25° C, reference point pin , unless otherwise specified Parameters Test Conditions Pin Symbol Min. Typ. Max. Unit Supply voltage range VS 4.5 5.0 9.0 V Supply current IS 27 33 mA DC input voltage VDC 1.75 Input resistance(1) Rin 680 DC Supply (Pin 13) Intercarrier Input 1 (Pin 1) Input limiting voltage Input signal vin: f = 5.5 MHz output signal AF1: vAF1 = -3 dB vlim V 750 Ω 150 µV Intercarrier Input 2, Pin 14 DC input voltage Input resistance (1) VDC 1.75 Rin 680 Input limiting voltage Input signal vin: f = 5.74 MHz output signal AF2: vAF2 = -3 dB vlim Input signal for automatic second sound carrier mute off (squelch) Audio output AF2 active vin > 0.7 1.0 V 750 Ω 150 µV < 1.5 mV FM Demodulators, Internal VCO’s (Pin 10) Free-running frequency fVCO 5.5 MHz ∆T = 55° C ∆fVCO 500 kHz Oscillator shift (free-running) as function of supply voltage 4.5 V < VS < 5.5 V ∆fVCO 200 kHz Adjustment range of free-running frequencies By external resistor Rref at pin 10 ∆fadj ±1 Rref 15 Oscillator drift (free-running) as function of temperature Adjustment resistance for free-running frequencies MHz 22 30 kΩ FM Demodulators, Internal VCO’s (Pin 10) Steepness of free-running frequency adjustment Resistor Rref at pin 10 S 200 kHz/kΩ Capture range of PLL’s ∆fcap ±1.4 ±1.9 MHz Holding range of PLL’s ∆fhold ±2.0 ±3.0 MHz Audio Outputs, AF1 (Pin 7) and AF2 (Pin 6) VDC 2.2 DC output current IDC 1.0 Output resistance(1) Rout 150 AC output peak current iAC DC output voltage Note: V -1.3 mA Ω ±1.0 mA 1. This parameter is given as an application information and not measured during final testing. 5 4794A–TVVCR–02/04 Electrical Characteristics (Continued) VS = 5 V, Tamb = 25° C, reference point pin , unless otherwise specified Parameters Test Conditions AF output voltage, RMS value vin = 10 mV f = 5.5 MHz FM-dev. = 27 kHz fmod = 1 kHz Difference between the output signals Pin Symbol Min. vAF Typ. 500 ∆vAF Total harmonic distortion vin = 10 mV f = 5.5 MHz FM-dev. = 27 kHz fmod = 1 kHz THD AM suppression vin = 10 mV f = 5.5 MHz fmod = 1 kHz reference signal: FM-dev. = 50 kHz test signal: m = 30% αAM Crosstalk attenuation between the AF outputs f = 50 Hz to 12.5 kHz Supply voltage ripple rejection VRR < 200 mV, f = 70 Hz Max. 0.1 46 Unit mV ±1 dB 0.5 % 66 dB αatt 70 dB RR 24 dB Mute Switch (Pin 3) Control voltage - mute off - mute on Control current AF outputs active AF outputs not active Vmute 2.0 0 Imute VS 0.8 150 V V µA Squelch Function, (Pin 4) Control voltage for automatic mute 2nd carrier - off - on Control current Note: 6 Vsque 0 2.0 Isque 0.8 VS 150 V V µA 1. This parameter is given as an application information and not measured during final testing. U2860B-M 4794A–TVVCR–02/04 U2860B-M Figure 3. Total Harmonic Distortion 0.5 0.4 THD (%) 0.3 0.2 0.1 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Frequency (MHz) Figure 4. AM Suppression 0 AM Suppression (dB) -10 -20 -30 -40 -50 -60 -70 -80 30 40 50 60 70 80 90 100 110 120 IF Input Level (dBµV) Figure 5. VCO Free-running Frequency 120.0 Pin 10 open umin (µV) 80.0 40.0 R10 = 30k R10 = 15k 0.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Frequency (MHz) 7 4794A–TVVCR–02/04 Figure 6. Capture and Hold Range VCO Control Voltage U8 (V) 3.0 2.5 Input level = caption 2.0 Input level = hold 1.5 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 Frequency (MHz) Figure 7. Limiter Characteristics AF Output Level (dB) 2 -2 -6 -10 f = 5.5 MHz, FM-dev. = +/- 50 kHz, fmod = 1 kHz, 50 µs de-emphasis -14 -18 26 28 30 32 34 36 38 40 42 44 IF Input Level (dB) Figure 8. Signal-to-noise Ratior -50 -55 (S+N)/N (dB) -60 -65 -70 -75 -80 0 2 4 6 8 10 Frequency (MHz) 8 U2860B-M 4794A–TVVCR–02/04 U2860B-M Figure 9. SIF Inputs 600 Ω 1,14 1.75 V 600 Ω Figure 10. Mute Switch/Squelch Switch 3.5 V 20 k Ω 2kΩ Figure 11. Audio Outputs 6,7 100 Ω 1.0 mA 9 4794A–TVVCR–02/04 Figure 12. Decoupling Capacitor 8,9 2.5 k Ω Figure 13. VCO Offset (Reference Resistor) 3.5 V 11.5 k Ω 10 22 k Ω Figure 14. Internal Supply Voltage Stabilization 11 3.5 V 10 U2860B-M 4794A–TVVCR–02/04 U2860B-M Figure 15. Test Circuit +5 V 22 mF 22 nF Cstab SIF 2 22 nF 10 µF 2.2 µF 2.2 µF 50Ω 14 13 12 11 10 9 8 U2860B-M 1 2 4 3 5 22 nF 7 6 3.3 k Ω SIF 1 50 Ω 3.3 k Ω 15 nF 15 nF Mute Squelch AF2 AF1 Figure 16. Application Circuit +5 V 22 µF 2.2 k Ω SFE 5.74 MC 1 kΩ 10 µF 2.2 µF 22 nF 680 Ω 14 13 12 11 2.2 µF 10 9 8 6 7 U2860B-M SIF 680 Ω 1 2 3 4 SFE 5.5 MC SFE 6.0 MC Mute Squelch 5 3.3 k Ω 3.3 kΩ 15 nF 15 nF AF2 AF1 11 4794A–TVVCR–02/04 Figure 17. PCB Layout (Test/Application Circuit) Figure 18. Component Layout (Test Circuit) Figure 19. Component Layout (Application Circuit) 12 U2860B-M 4794A–TVVCR–02/04 U2860B-M Ordering Information Extended Type Number Package Remarks U2860B-MFP SO14 Tube U2860B-MFPG3 SO14 Taped and reeled Package Information Package SO14 5.2 4.8 Dimensions in mm 8.75 3.7 1.4 0.25 0.10 0.4 1.27 6.15 5.85 7.62 14 0.2 3.8 8 technical drawings according to DIN specifications 1 7 13 4794A–TVVCR–02/04 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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