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problem of ADV7842 Analog input with water ripple interfere

Question asked by huakaimanlin on Feb 26, 2016
Latest reply on Feb 26, 2016 by GuenterL

hi, all

     I am working with ADV7842 video capture,the PCB is our own, when configure ADV7842 with analog input(YPbPr、CVBS、VGA), the output has some interfere looks like water ripple, it's not static, like a moving wave. could anyone give me some advice.

 

     http://www.analog.com/en/products/audio-video/analoghdmidvi-interfaces/analog-hdmidvi-display-interfaces/adv7842.html#pr…

     our PCB and configuration both refer to link above, and the format output from ADV7842 is correct, so I think the configuration is correct. my question is :

     1. does any one deal with this issue? is that the PCB board interference?

     1. Does there has some configuration register of ADV7842 can make it better?

 

here is ADV7842 output effect:

     wave.jpg

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