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AD723,pdf datasheet (Load Dete

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  • 标      签: 视频编码器 Detect

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The AD723 is a predominantly analog design, with digital logiccontrol of TIming. This TIming logic is driven by an externalfrequency reference at four TImes the color subcarrier frequency,input into the 4FSC pin of the AD723. This frequency shouldbe 14.318 180 MHz for NTSC encoding, and 17.734 475 MHzfor PAL encoding. The 4FSC input accepts standard 3 V CMOSlogic levels. The duty cycle of this input clock is not criTIcal, buta fast-edged clock should be used to prevent excessive jitter inthe timing. 更多视频编码器请查看:http://www.elecfans.com/soft/special/encoders/
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