GENERAL DESCRIPTION

The various versions of theTDA935X/6X/8X PS/N2 series

combine the functions of a TV signal processor together

with a m-Controller and US Closed Caption decoder. Most

versions have a Teletext decoder on board. The Teletext

decoder has an internal RAM memory for 1or 10 page text.

The ICs are intended to be used in economy television

receivers with 90° and 110° picture tubes.

The ICs have supply voltages of 8 V and 3.3 V and they

are mounted in S-DIP envelope with 64 pins.

The features are given in the following feature list. The

differences between the various ICs are given in the table

on page 4.

FEATURES

TV-signal processor

· Multi-standard vision IF circuit with alignment-free PLL

demodulator

· Internal (switchable) time-constant for the IF-AGC circuit

· A choice can be made between versions with mono

intercarrier sound FM demodulator and versions with

QSS IF amplifier.

· The mono intercarrier sound versions have a selective

FM-PLL demodulator which can be switched to the

different FM sound frequencies (4.5/5.5/6.0/6.5 MHz).

The quality of this system is such that the external

band-pass filters can be omitted.

· Source selection between ‘internal’ CVBS and external

CVBS or Y/C signals

· Integrated chrominance trap circuit

· Integrated luminance delay line with adjustable delay

time

· Picture improvement features with peaking (with

variable centre frequency and positive/negative

overshoot ratio) and black stretching

· Integrated chroma band-pass filter with switchable

centre frequency

· Only one reference (12 MHz) crystal required for the

m-Controller, Teletext- and the colour decoder

· PAL/NTSC or multi-standard colour decoder with

automatic search system

· Internal base-band delay line

· RGB control circuit with ‘Continuous Cathode

Calibration’, white point and black level offset

adjustment so that the colour temperature of the dark

and the light parts of the screen can be chosen

independently.

· Linear RGB or YUV input with fast blanking for external

RGB/YUV sources. The Text/OSD signals are internally

supplied from the m-Controller/Teletext decoder

· Contrast reduction possibility during mixed-mode of

OSD and Text signals

· Horizontal synchronization with two control loops and

alignment-free horizontal oscillator

· Vertical count-down circuit

· Vertical driver optimized for DC-coupled vertical output

stages

· Horizontal and vertical geometry processing

· Horizontal and vertical zoom function for 16 : 9

applications

· Horizontal parallelogram and bow correction for large

screen picture tubes

· Low-power start-up of the horizontal drive circuit