U4479B

Preliminary Information

TELEFUNKEN Semiconductors

Rev. A2, 14-Jan-98

1 (11)

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 Active carrier generation by FPLL principle

(frequency-phase-locked-loop) for true synchronous

demodulation in the “analog mode”

D Switchable VCO frequency (33.4/38.9/43.0 MHz)

D Very linear video demodulation, good pulse response

and excellent intermodulation figures

D Bandwidth of the output signal 10 MHz (–1 dB) in

DVB mode

D Alignment-free AFC

D AGC for negative modulation signals (peak sync

detection) and for positive modulation (peak white/

black level detector)

D AGC with average detection for the QAM modulated

DVB signal, reference level is adjustable

D Tuner AGC with adjustable take over point

D Alignment-free quasi parallel sound (QPS) mixer for

FM/NICAM sound IF signals

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 Two IF inputs for DVB-/Analog Video IF

D One sound IF input

Ordering Information

Extended Type Number

Package

Remarks

U4479B-MFLG3

SO28

Taped and reeled