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U4479B Datasheet

  • U4479B

  • DVB-Cable IF Converter and Full Multi-Standard Video-/Sound ...

  • 249.12KB

  • 11頁

  • TEMIC

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U4479B
DVB-Cable IF Converter and
Full Multi-Standard Video-/Sound IF Processing
Description
The U4479B is a bipolar circuit for the processing of
cable DVB IF (Digital
Video Broadcasting)
and multi-
standard analog TV IF signals. The combi circuit
processes QAM modulated IF signals, all TV video IF
with negative/ positive modulation and the FM/ NICAM,
AM sound IF signals. With 5 V supply voltage the IC is
suitable for cable DVB receiver (set top boxes).
Features
D
5 V supply voltage; low power consumption
D
DVB signal processing with a converter for the 2nd IF;
VCO is controlled by an external PLL
D
AGC with average detection for the QAM modulated
DVB signal, reference level is adjustable
D
Active carrier generation by FPLL principle
(frequency-phase-locked-loop) for true synchronous
demodulation in the 鈥渁nalog mode鈥?/div>
D
Tuner AGC with adjustable take over point
D
Alignment-free quasi parallel sound (QPS) mixer for
FM/NICAM sound IF signals
D
Switchable VCO frequency (33.4/38.9/43.0 MHz)
D
Very linear video demodulation, good pulse response
and excellent intermodulation figures
D
Complete alignment-free AM demodulator with gain
controlled AF output
D
Bandwidth of the output signal 10 MHz (鈥? dB) in
DVB mode
D
Separate SIF-AGC with average detection
D
Parallel operation of the AM demodulator and QPS
mixer (for NICAM-L stereo sound)
D
Alignment-free AFC
D
AGC for negative modulation signals (peak sync
detection) and for positive modulation (peak white/
black level detector)
D
Two IF inputs for DVB-/Analog Video IF
D
One sound IF input
Ordering Information
Extended Type Number
U4479B-MFLG3
Package
SO28
Remarks
Taped and reeled
TELEFUNKEN Semiconductors
Rev. A2, 14-Jan-98
1 (11)
Preliminary Information

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