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AD9783 - "seek" register unstable

Question asked by 李清灵 on Jun 6, 2016
Latest reply on Jun 11, 2016 by 李清灵

I have changed different delays including sample, set and hold registers, but "seek" triggers all the time with one given condition.I checked both I and Q output, they cross signals periodically at few kHz and the cross time is about few [us].

I guessed it was the DA sample-clock jitter that cause the problem, so I changed crystal from 125MHz to 200MHz for less time jitter on the same board but the problem still exist. What can I do next?