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TDA4472 Video-IF and Quasi Parallel Sound Processing Description The TDA4472 is an integrated bipolar circuit for video/ sound IF (VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processes all TV video IF signals with negative modulation (e.g., B/G standard), and the FM/NICAM sound IF signals. Features D 5 V supply voltage; low power consumption D Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation D Very linear video demodulation, good pulse response and excellent intermodulation figures D VCO circuit operates at picture carrier frequency D Alignment-free AFC without external reference circuit, polarity of the AFC curve is switchable D VIF-AGC with peak sync. detection D Tuner AGC with adjustable take over point Package: SDIP28, SO28 D Alignment-free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals D Intercarrier output signal is gain controlled (necessary for digital sound processing) D Separate SIF-AGC with average detection D Two independent SIF inputs D Package and relevant pinning is compatible with the multistandard version TDA4470, which simplifies the design of an universal IF module Ordering Information Extended Type Number TDA4472-MSD TDA4472-MFLG3 Package SDIP28 SO28 Remarks Delivery in taped form Rev. A3, 23­FEb­01 1 (14) Preliminary Information TDA4472 Block Diagram Offset comp. (optional) Loop filter VCO FPL L 0° 90° AFC 6 VIF VIF amp Video det. 7 CAGC 8 AGC (VIF) 11 10 Tuner AGC FM det. Supply Take over point 27 28 SIF 2 SIF amp Input switch 3 1 SIF 1 2 AGC (SIF) 5 CAGC 94 8719 Figure 1. Block diagram 2 (14) Preliminary Information ПП ПП П ПП ПП ПП ПП ПП ПП ПП ПП ПП ПП ПП Tuner ПП ПП VCO + phase shift ПП ПП ПП П П П П П П ПП ПП ПП ПП ПП ПП ПП ПП ПП ПП ПП ПП ПП П П 26 18 20 21 П П AFC switch 19 22 AFC 12 Video 4,9,16 23 VS 17 CRef 24 Intercarrier (FM / NICAM) Rev. A3, 23­FEb­01 TDA4472 Circuit Description Vision IF Amplifier The video IF signal (VIF) is fed through a SAW filter to the differential input (Pin 6-7) of the VIF amplifier. This amplifier consists of three AC-coupled amplifier stages. Each differential amplifier is gain controlled by the automatic gain control (VIF-AGC). The output signal of the VIF amplifier is applied to the FPLL carrier generation and the video demodulator. designed for low distortion and large bandwidth. The demodulator output signal passes an integrated low pass filter for attenuation of the residual vision carrier and is fed to the video amplifier. The video amplifier is realized by an operational amplifier with internal feedback and 8 MHz bandwidth (­3 dB). An additional noise clipping is provided. The video signal is fed to VIF-AGC and to the video output buffer. This amplifier with a 6 dB gain offers easy adaption of the sound trap. For nominal video IF modulation the video output signal at Pin 12 is 2 Vpp. Tuner-and VIF-AGC At Pin