Features • 5-V Supply Voltage • Gain-controlled 3-stage Wide-band IF Amplifier • Active Carrier Generation by FPLL Principle (Frequency-Phase-Locked-Loop) for True Quadrature Demodulation • Complete Alignment-free AM Demodulator • Switchable Amplitude Detector for Gain Control, which Operates as a Peak Detector for FM Sound and as a Mean Level Detector for AM Sound Description The U4468B is an integrated bipolar circuit for full multistandard sound IF signal processing in TV/VTR and multimedia applications. It supplies AM signals as well as FM/NICAM sound IF signals and thus allows the design of a universal sound IF module for various applications. U4468B Figure 1. Block Diagram VS 4 Loop filter 14 5 REF IFFM 2 Quasi-split Sound Circuit and AM Demodulator IC 8 05 905 FPLL VCO VCO 9 IF-amp 12 1 Intercarrier (FM) IFAM Mean 3 6 AF (AM) AGC AM-det Peak level 7 13 IF AGC Mean/peak 10 S1 Mute S2 Rev. 4777A–TVVCR–01/04 Circuit Description IF Amplifier and AGC The symmetrical IF input signal from the external SAW filter is fed to the pins 1 and 2. In case of FM/NICAM applications, a SAW filter with double band-pass characteristic is required for the vision and sound carrier. In case of the L-standard, a band-pass filter with the center frequency at the L-sound carrier is used. The amplifier consists of three AC-coupled wide-band IF stages. Each differential amplifier stage is gain controlled by the AGC (Automatic Gain Control) voltage, available at pin 3. The output signal of the IF amplifier is then applied to the FPLL carrier generation, to the mixer for FM/NICAM signals and to the AM demodulator. The IF-AGC is derived from the average level of the AM carrier (L-standard) or from the peak value of the FM carrier (e.g., B/G standard). It controls the three-stage wide-band amplifier to provide a constant SIF signal to the AM demodulator or to the QSS (quasisplit sound) mixer. Standard Switch If the standard switch (pin 7) is in position “low” (for AM sound), the AGC is operating as an average level detector. In position “open” or “high” (for FM/NICAM sound), the AGC acts as a peak value detector. Internal Voltage Stabilizer The internal band gap reference voltage (4.25 V at pin 4) ensures constant performance, independent of supply voltage and temperature. FPLL, VCO The FPLL (frequency-phase-locked loop) circuit consists of a frequency detector and a phase detector to generate a control voltage for the VCO tuning. In locked mode, the VCO is controlled by the phase detector while in unlocked mode, the frequency detector is superimposed. The VCO operates with an external resonance circuit (L and C parallel) and is controlled by integrated varicaps. A practicable VCO alignment of the external coil is the adjustment of the loop filter voltage (pin 5) to 2.3 V. At this value, the capture and hold range are centered. AM Demodulator The alignment-free AM demodulator is realized by a synchronous detector. The modulated IF signal from the wide-band IF amplifier output is multiplied in phase with the limited SIF signal to remove the AM. Then, the resulting AF signal of the demodulator output is fed to the output amplifier and to the AGC stage. Quasi-Split-Sound (QSS) The QSS mixer is realized by a multiplier circuit. The IF signal (FM/NICAM) is converted to the intercarrier frequency by means of a quadrature signal from the generated picture Mixer carrier provided by the PLL. The intercarrier signal is fed via an output amplifier to pin 12. Mute Switch 2 The AM sound output (pin 6) can be muted by switching the pulling mute switch (pin 10) to “low”. U4468B 4777A–TVVCR–01/04 U4468B Pin Configuration Figure 2. Pinning DIP16 VIIF 1 16 NC VIIF 2 15 NC CAGC 3 14 VS CREF 4 13 GND LF 5 12 VO,AM 6 11 NC VSW,AGC 7 10 VSW,MUTE VVCO 8 9 U4468B VO,FM VVCO Pin Description Pin Symbol Function 1, 2 VI,IF 3 CAGC Capacitor for the AGC time constant 4 CREF Capacitor for the internal reference voltage 5 LF 6 VO,FM 7 VSW,AGC 8, 9 VVCO 10 IF input (symmetrical) Loop filter AF output (AM sound) Standard switch VCO circuit VSW,MUTE Mute switch 12 VO,FM 13 GND Intercarrier output (FM sound) 14 VS Supply voltage (5 V) 11, 15, 16 NC Not connected Ground 3 4777A–TVVCR–01/04 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 13, unless otherwise specified. Parameters Pin Symbol Value Unit Supply voltage range 14 Vs 4.5 to 9.0 V Supply current 14 Power dissipation (VS = 9 V) Output currents 6, 12 Is 55 mA P 500 mW Iout 5 mA +4.5 V 1 - 4, 6, 12 External voltages 5, 8, 9 Vext +3.5 V Vs V Tj +125 °C Tamb 0 to +85 °C Tstg -25 to +125 °C VESD ±300 V Symbol Value Unit RthJA 60 K/W 7, 10 Junction temperature Operating temperature range Storage temperature Electrostatic handling(1) Note: All 1. Equivalent to discharging a 200-pF capacitor through a 0-W resistor Thermal Resistance Parameters Junction ambient when soldered to PCB 4 U4468B 4777A–TVVCR–01/04 U4468B Electrical Characteristics VS = +5 V, Tamb = +25°C; reference point pin 13, unless otherwise specified. Parameters Test Conditions Symbol Min. Typ. Max. Unit VS 4.5 5.0 9.0 V DC Supply (Pin 14) Supply voltage Supply current Vin =10 mV or V3 = 2 V IS 40 mA IF Input (Pins 1, 2) 50 µVrms 100 mVrms Rin 1.2 kW Cin 2 pF 65 dB 4.7 µF Minimum IF input signal Output signal: -3 dB vin Maximum IF input signal Output signal: +1 dB vin Input impedance (1) Input capacitance (1) 70 SIF-AGC (Pin 3) IF gain control range Gv AGC capacitor 60 CAGC FPLL and VCO (Pins 5, 8, and 9) Maximum oscillator frequency For carrier generation fVCO 70 Vision carrier capture range fVCO = 38.9 MHz CVCO = 6.2 pF Dfcap ±1.5 Oscillator drift (free running) as function of temperature DTamb = 55°C, fVCO = 38.9 MHz CVCO = 6.2 pF(2) Df/DT Switching voltage for mode 1: FM/NICAM sound Peak value control(3) Vsw1 Switching voltage for mode 2: AM sound Average level control Vsw2 MHz ±2 MHz -0.3 % 2.0 VS V 0 1.5 V Standard Switch (Pin 7) Switching current Isw ±100 µA AM Mute Switch (Pin 10) Switching voltage AM output active Vmute1 Switching voltage AM output switched off Vmute2 Switching current open 0 1.5 Imute -100 VDC 2 V µA (4) Intercarrier Output (Pin 12) DC output voltage Output resistance (1) Intercarrier output signal vin = 10 mV 5.5 MHz output signal Intercarrier bandwidth -1 dB -3 dB Notes: Rout Vout B V 200 100 W 150 mVrms TBD TBD MHz MHz 1. 2. 3. 4. This parameter is given as an application information and is not tested during production. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit. Without external control voltage (pin 7 open), the IC automatically operates in mode 1. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz; PC/SC1 =13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level). 5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV. 5 4777A–TVVCR–01/04 Electrical Characteristics (Continued) VS = +5 V, Tamb = +25°C; reference point pin 13, unless otherwise specified. Parameters Test Conditions Weighted signal-to-noise ratio (CCIR 468) B/G mod. VIF signal: vin =10 mV FM deviation = ±27 kHz fmod = 1 kHz Tested with U2860B Black screen: channel 1/2 Color bar: channel 1/2 Ripple rejection Tested from pin 14 to 12(1) Symbol Min. Typ. Max. 60/58 58/56 RR Unit dB dB 35 dB Allowable AC output peak current IAC ±0.7 mA Allowable DC output current IDC -2 mA AF Output - AM (Pin 6) DC output voltage 2.2 VDC V W Output resistance (1) Rout AF output signal m = 54%(5) voAF 500 mVrms AF bandwidth -3 dB(5) B TBD kHz Total harmonic distortion m = 54% fmod = 1 kHz, 12.5 kHz THD 1 Weighted signal-to-noise ratio (CCIR 468) Reference: m = 54%(5) fmod = 1 kHz S/N 56 Ripple rejection Tested from pin 14 to 6(1) RR 150 2 % dB 28 dB Allowable AC output peak current IAC ±0.3 mA Allowable DC output current IDC -1 mA Notes: 6 1. 2. 3. 4. This parameter is given as an application information and is not tested during production. The oscillator drift is related to the picture carrier frequency, with an external temperature-compensated LC circuit. Without external control voltage (pin 7 open), the IC automatically operates in mode 1. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz; PC/SC1 =13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level). 5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV. U4468B 4777A–TVVCR–01/04 U4468B Figure 3. Test Circuit VS +5 V 22 µF 270 Ω Rx 500 Ω 10 nF SFT 5.74 MA 10 µF 14 13 12 11 2.2 µF 2.2 µF 10 9 8 5 6 7 680 Ω U2860B 680 Ω 1 2 3 4 3.3 kΩ 3.3 kΩ SFT 5.5MA 15 nF Intercarrier frequency Mute Squelch 15 nF AF2 AF1 VS +5 V 22 µF 10 nF NC NC 16 15 VCO (38.9 MHz) Mute S2 NC 14 13 12 11 10 9 L1 Standard B/G IF 33.4 MHz 38.9 MHz U4468B 1 2 3 4.7 µF Standard L 4 5 8.2 pF 6 7 S1 4.7 µF 470 nF 8 AGC (Mean/Peak) 150 Ω AF (AM) 32.4 MHz 7 4777A–TVVCR–01/04 Internal Pin Configuration Figure 4. Sound IF Inputs (Pins 1 and 2) 10 kΩ 10 kΩ 2.3 V 2 kΩ 2 kΩ 2 1 Figure 5. AGC Time Constant (Pin 3) 3 Figure 6. Internal Reference Voltage (Pin 4) 4 4.25 V 3.5 V Figure 7. Loop Filter (Pin 5) 5 2.75 V 8 U4468B 4777A–TVVCR–01/04 U4468B Figure 8. AM Output (Pin 6) 1.45 V 6 100 Ω 1 mA IDC Figure 9. AGC Switch (Pin 7) 3.5 V 17 kΩ 15.5 kΩ 7 23 kΩ Figure 10. VCO (Pins 8 and 9) 3 kΩ 3 kΩ 8 9 Figure 11. Mute Switch (Pin 10) 3.5 V 20 kΩ 10 2.6 V 20 kΩ 9 4777A–TVVCR–01/04 Figure 12. Intercarrier Output (Pin 12) 120 Ω 12 1.4 mA IDC Ordering Information Extended Type Number Package U4468B Remarks DIP16 – Package Information Package DIP16 Dimensions in mm 7.82 7.42 20.0 max 4.8 max 6.4 max 0.5 min 3.3 1.64 1.44 0.58 0.48 2.54 0.39 max 9.75 8.15 17.78 Alternative 16 9 technical drawings according to DIN specifications 1 10 8 U4468B 4777A–TVVCR–01/04 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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The Company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of Atmel are granted by the Company in connection with the sale of Atmel products, expressly or by implication. Atmel’s products are not authorized for use as critical components in life support devices or systems. © Atmel Corporation 2004. All rights reserved. Atmel ® and combinations thereof are the registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be the trademarks of others. Printed on recycled paper. 4777A–TVVCR–01/04 This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components.