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Problems with AD9928 and sharp CCD

We met a  problem in using AD9928.We use two AD9928 to drive a sharp CCD,

but the ad9928 output data is very shrange,the difference between two adjacent pixels is large.

For example,the output data maybe 10,70,13,80,10,70.

So the output image looks very strange.

Please kindly help give some suggestions.