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TDA4474 Datasheet

  • TDA4474

  • Multistandard Video-IF and Quasi Parallel Sound Processing

  • 18頁

  • TEMIC

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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鈥揻ree quasi parallel sound (QPS) mixer
for FM/NICAM sound IF signals
D
Intercarrier output signal is gain controlled
(frequency鈥損hase鈥搇ocked鈥搇oop)
synchronous demodulation
for
true
(necessary for digital sound processing)
D
Complete alignment鈥揻ree 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鈥揂GC with average detection
D
Parallel operation of the AM demodulator and
frequency, the VCO frequency is switchable for
the L鈥?mode
D
Alignment鈥揻ree AFC without external reference
QPS mixer (for NICAM鈥揕 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 switchable
D
VIF鈥揂GC for negative modulated signals
(peak sync detection) and for positive modulation
(peak white/black level detector)
D
Tuner AGC with adjustable take over point
the TDA4471; simplifies the design of an
universal IF module
Package:
30 pin shrink鈥揹ual鈥搃nline鈥損lastic (SDIP30)
Rev. A1: 17.08.1995
Preliminary Information
1 (17)

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