Tda 4470-Multistandard Video-If And Quasi Parallel Sound Processor; Description; Features; Pinning - Daewoo CP-885 Service Manual

Service manual WP 895/895F, CP885/885F
Pin No. Pin Name
59 ANA_IN1-
60 NC
61 TESTEN
62 XTAL_IN
63 XTAL_OUT
64 NC

4-3 TDA 4470-Multistandard Video-IF and Quasi Parallel Sound Processor

4-3-1- Description

The TDA 4470 is an integrated bipolar circuit for multi-standard 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.

4-3-2- Features

- 5V supply voltage ; low power consumption.
- Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation.
- Very linear video demodulation, good pulse response and excellent intermodulation figures.
- Alignment-free AFC without external reference circuit, polarity of the AFC curve is switchable.
- VIF-AGC for negative modulated signals (peak sync. detection) and for positive modulation
(peak white/black level detector).
- Tuner AGC with adjustable take over point.
- Alignment-free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals.
- Intercarrier output signal is gain controlled (necessary for digital sound processing).
- Complete alignment-free AM demodulator with gain controlled AF output.
- Separate SIF-AGC with average detection
- Two independent SIF inputs
- Parallel operation of the AM demodulator and QPS mixer (for NICAM-L stereo sound).

4-3-3- Pinning

Pin
1,2
3
4,9,16
5
6,7
8
10
11
12
13
14
15
17
18
Type Short description
In IF common
Not Connected
In Test pin
In Crystal oscillator
Out Crystal oscillator
Test pin
Symbol
V SIF1 input ( symmetrical)
i,SIF1
V Input selector switch
SW
GND Ground
V SIF-AGC (time constant)
AGC
V VIF input (symmetrical)
i,VIF
C VIF-AGC (time constant)
AGC
R Take Over Point, tuner AGC
TOP
I Tuner AGC output current
tun
V Video output
O,VID
V Standard switch
SW
V L'switch
SW
C Black level capacitor
bl
C Internal reference voltage
ref
LF Loop Filter
Function
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