TA8783N视频-色度-行场扫描-小信号处理集成电路（国外英文资料）.docVIP

TA8783N视频-色度-行场扫描-小信号处理集成电路（国外英文资料） TA8783N video/color/line scan small signal processing integrated circuit First, function TA8783N is a large-screen multi-color television special integrated circuit made by Toshiba of Japan. The working state of the integrated circuit is controlled by the I C bus data signal. Under the control of the bus data signal output from the microprocessor (CPU), the TA8783N mainly completes the processing and formation of the row field excitation pulse signals for the video/color signal. The main models include C2518, C2919PV, C3418PN, etc. Related circuit principles and maintenance points The chromaticity signal processing circuit The chromaticity signal processing circuit is composed of the components and the integrated blocks inside the unit (s) (1) ~ (30) foot, (64) foot external circuit and the integrated unit. The main task of the circuit is to extract the r-y, b-y signal from the chromaticity signal. Integrated block (15) ~ (30) foot external components and integrated block internal related circuit make up the color subcarrier recovery of chrominance signal demodulation circuit, chroma signal amplification, automatic identification of chrominance signal system circuit. The integrated block (15) foot is the control signal output for the control signal, and the output control voltage is derived from the color automatic recognition circuit within the integrated circuit. The (15) foot voltage varies between 0V and 7.4 V when the TV is not input. When the TV receives the PAL signal, (15) the foot voltage is 0V; When the TV receives the NTSC signal, (15) the feet output the high level 7.4 V. (15) feet output control voltage is only in the TV signal input and color subcarrier recovery, chroma signal amplification and chrominance signal system under normal operation of automatic identification circuit work can be fixed on the specific voltage ( 0 V or 7.4 V ). On TV, when there is no color breakdown if the measured voltage (15) feet in betw