Konka lc-tm2008 LCD color TV video decoding circuit diagram

　　n301 (saa7114h) is a pal/ntsc/secam three-standard video signal decoder (a digital Decoder), its internal block composition is shown in the figure.

　　As can be seen from the internal block diagram in the figure, it is different from the common decoding ICs in the past. Input tv/av video signals from pins (20), (18), (16), and (14). First, analog-to-digital conversion is performed, and after it becomes a digital signal, it enters the adaptive comb filter, and then performs digital decoding and dedicated vbl data current limiting and line and field processing. Its (31) and (32) pins are the i2c bus Serial clock/serial data input, ⑦ and ⑥ pins are connected to an external crystal (z301) 24.576mhz and the internal clock generator circuit to form the reference clock.