TDA4474

TELEFUNKEN Semiconductors TDA4474 Multistandard Video-IF and Quasi Parallel Sound Processing Description The TDA4474 is an integrated bipolar circuit for full multistandard 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), positive modulation (e.g. L standard) and the AM, FM/NICAM sound IF signals. Four IF inputs (2 x VIF plus 2 x SIF) and the common pinning with TDA4471 gives flexibility to design a universal IF module for various applications. Features D 5V supply voltage; low power consumption D Active carrier generation by FPLL principle D Alignment–free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals D Intercarrier output signal is gain controlled (frequency–phase–locked–loop) synchronous demodulation for true (necessary for digital sound processing) D Complete alignment–free AM demodulator with D Very linear video demodulation, good pulse response and excellent intermodulation figures D VCO circuit is operating on picture carrier gain controlled AF output D Separate SIF–AGC with average detection D Parallel operation of the AM demodulator and frequency, the VCO frequency is switchable for the L’ mode D Alignment–free AFC without external reference QPS mixer (for NICAM–L stereo sound) D Four IF inputs (2 x VIFin and 2 x SIFin) D Package and relevant pinning is compatible with circuit, polarity of the AFC curve is switcha...