GENERAL DESCRIPTION
The various versions of theTDA935X/6X/8X series combine the functions of a TV signal processor together with a µ-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
• Asymmetrical ‘delay line type’ peaking in the luminance channel
• Black stretching for non-standard luminance signals
• Integrated chroma band-pass filter with switchable centre frequency
• Only one reference (12 MHz) crystal required for the µ-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 off set 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 µ-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

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