ITT IDEAL COLOR 3794 HIFI CHASSIS COMPACT CHASSIS 80 DST 5861 70 22 UNITS VIEW.

-




















Video Luminance + Chrominance with TDA3561A :44 08 08/d
TDA3561A (PHILIPS)

Luminance+Chrominance+RGB MATRIX

PAL decoder TDA3561A

GENERAL DESCRIPTION



The TDA3561A is a decoder for the PAL colour television standard. It combines all functions required for the identification
and demodulation of PAL signals.

Furthermore it contains a luminance amplifier, an RGB-matrix and amplifier. These
amplifiers supply output signals up to 5 V peak-to-peak (picture information) enabling direct drive of the discrete output
stages.
The circuit also contains separate inputs for data insertion, analogue as well as digital, which can be used for text display systems (e.g. (Teletext/broadcast antiope), channel number display, etc. Additional to the TDA3560, the
circuit includes the following features:

· The peak white limiter is only active during the time that the 9,3 V level at the output is exceeded.
The start of the
limiting function is delayed by one line period. This avoids peak white limiting by test patterns which have abrupt transitions from colour to white signals.

· The brightness control is obtained by inserting a variable pulse in the luminance channel. Therefore the ratio of brightness variation and signal amplitude at the three outputs will be identical and independent of the difference in gain of the three channels. Thus discolouring due to adjustment of contrast and brightness is avoided.

· Improved suppression of the internal RGB signals when the device is switched to external signals, and vice versa.

· Non-synchronized external RGB signals do not disturb the black level of the internal signals.

· Improved suppression of the residual 4,4 MHz signal in the RGB output stages.

· Cascoded stages in the demodulators and burst phase detector minimize the radiation of the colour demodulator
inputs.

· High current capability of the RGB outputs and the chrominance output.


- FRAME Deflection output with TDA2653A (PHILIPS)

- Synchronization with TDA1940F (ITT)


- Sound Unit and Audio Features Unit :45 08 45 - 9

- Tuner Unit + IF HF-Modul OS. FS. Paral : 5828 04 26 with TDA4442 (TELEFUNKEN) + TDA4445 (TELEFUNKEN) + SL1430 (PRESCALER)


TDA4445 SOUND IF AMPLIFIER
DESCRIPTION
TDA4445A:
Sound IF amplifier, with FM processing for quasi
parallel sound system.
TDA4445B:
Sound IF amplifier, with FM processing and AM
demodulator, for multi-standard sound TV appliances.
TDA4445Badditionnal :
Bistandard applications (B/G and L)
No adjustment of the AM demodulator
Low AMdistortion

QUADRATURE INTERCARRIER DEMODULATOR
.VERY HIGH INPUT SENSITIVITY
.GOODSIGNALTO NOISE RATIO
.FAST AVERAGINGAGC
.IF AMPLIFIER CAN BE SWITCHED OFF FOR VTR MODE
.GOOD AM SUPPRESSION .OUTPUT SIGNAL STABILIZED AGAINST
SUPPLY VOLTAGE VARIATIONS
.VERY FEW EXTERNAL COMPONENTS


GENERAL DESCRIPTION
This circuit includes the following functions :
.Three symmetrical and gain controlled wide
band amplifier stages, which are extremely stable
by quasiDC coupling without feedback.
.Averaging AGC with discharge control circuit
.AGC voltage generator
Quasi parallel sound operation :
.High phase accuracy of the carrier signal processing,
independentfrom
Linear quadrature demodulator
.Sound-IF-amplifier stage with impedance converter
AM-Demodulation (only TDA4445B) :
Carrier controlled demodulator .Audio frequency stage with impedance converter
.Averaging low passAGC


TDA4442 VIDEO IF AMPLIFIER
DESCRIPTION
The TDA4442 is a Video IF amplifier with standard
switch for multistandard colour or monochromeTV
sets, and VTR’s.

GENERAL DESCRIPTION
This video IF processing circuit integrates the following
functional blocks :
.Three symmetrical, very stable, gain controlled
wideband amplifier stages - without feedback
by a quasi-galvanic coupling.
.Demodulator controlled by the picture carrier
.Video output amplifier with high supply voltage
rejection
.Polarity switch for the video output signal
.AGC on peak white level
.GatedAGC
.Discharge control
.Delayed tuner AGC .At VTR Reading mode the video output signal
is at ultra white level