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AD9888 vertical noise - left/right pixel alternating

Question asked by cottrela on May 22, 2015
Latest reply on Jun 1, 2015 by GuenterL

Hi,

 

We have two products that use the AD9888 as an analogue front end. We use the AD9888 to sample odd & even pixels which then get combined inside our FPGA.

 

On both our products we see vertical noise on the left-hand pixel, which differs in magnitude to the vertical noise on the right-hand pixel. There is approximately 12-pixel colour difference between the left and right pixels.

 

We can tune the video with perfectly well, however but no matter how we adjust the phase the vertical noise does not go away. We can see this issue at all resolutions we have tested.

 

In addition, our problem seems to have been reported previously on at least one thread:-

> https://ez.analog.com/message/64742#64742

 

Please can you summarise the conclusions that have been reached so that we can find a solution to this issue?

 

Best Regards,

Adam

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