TDA4474 Datasheet, PDF (1/17 Pages) TEMIC Semiconductors – Multistandard Video-IF and Quasi Parallel Sound Processing

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
(frequency–phase–locked–loop) for true
synchronous demodulation
D Very linear video demodulation, good pulse
response and excellent intermodulation figures
D VCO circuit is operating on picture carrier
frequency, the VCO frequency is switchable for
the L’ mode
D Alignment–free AFC without external reference
circuit, polarity of the AFC curve is switchable
D VIF–AGC for negative modulated signals
(peak sync detection) and for positive modulation
(peak white/black level detector)
D Tuner AGC with adjustable take over point
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 Complete alignment–free AM demodulator with
gain controlled AF output
D Separate SIF–AGC with average detection
D Parallel operation of the AM demodulator and
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
the TDA4471; simplifies the design of an
universal IF module
Package:
30 pin shrink–dual–inline–plastic (SDIP30)
Rev. A1: 17.08.1995
Preliminary Information
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