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Noise on analog VGA signals with ADV7604

Question asked by cdb on Jun 24, 2011
Latest reply on Aug 3, 2011 by cdb

I'm having a problem with noisy analog VGA signals with the ADV7604.  Originally I thought it was a layout issue, but I made significant changes to how the analog video was routed to the ADV7604 as well as improving bypass capacitor layout and ground and power planes and it made no difference.  I've tried to follow the recommended layout guidelines in your manuals as well as filtering all power to the ADV7604 with ferrite beads and the recommended bypass caps.  I used the evaluation board's layout as a guide.

 

Does anybody have any recommendations?  I'm using AIN7, 8, and 9 for one set of VGA input signals and AIN1, 2, and 3 for a second set.

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