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TDA956X Fiches technique(PDF) 2 Page - NXP Semiconductors |
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TDA956X Fiches technique(HTML) 2 Page - NXP Semiconductors |
2 / 125 page 2000 Jun 22 2 Philips Semiconductors Tentative Device Specification TV signal processor-Teletext decoder with embedded µ-Controller TDA955X/6X/8X PS/N1 series GENERAL DESCRIPTION The various versions of the TDA955X/6X/8X PS/N1 series combine the functions of a video processor together with a µ-Controller and US Closed Caption decoder. Several 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 an S-DIP 64 envelope. 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. In the QSS versions without East-West output an AM/FM mode can be activated. In that case both the QSS amplifier (for AM demodulation) and the FM demodulator are available. • The mono intercarrier sound circuit has 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. • The FM-PLL demodulator can be set to centre frequencies of 4.74/5.74 MHz so that a second sound channel can be demodulated. In such an application it is necessary that an external bandpass filter is inserted. • The QSS amplifier and mono intercarrier sound circuit of some versions can be used for the demodulation of FM radio signals • Source selection between the ‘internal’ CVBS and one external CVBS or Y/C signal • Integrated chrominance trap circuit • Integrated luminance delay line with adjustable delay time • Picture improvement features with peaking (with switchable centre frequency, depeaking, variable positive/negative overshoot ratio and video dependent coring) and blue- and black stretching • 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 • Indication of the Signal-to-Noise ratio of the incoming CVBS signal • 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. • A linear RGB/YUV/YPBPR input with fast blanking for external RGB/YUV sources. The synchronisation circuit can be connected to the incoming Y signal. The Text/OSD signals are internally supplied from the µ-Controller/Teletext decoder. • Contrast reduction possibility during mixed-mode of OSD and Text signals • Adjustable ‘wide blanking’ of the RGB outputs • 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 |
Numéro de pièce similaire - TDA956X |
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Description similaire - TDA956X |
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