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Noise in some channels

Category: Hardware
Product Number: AD9279

A few channels have abnormal noise. 

The below raw data has 1 bit noise and is acceptable.

1 bit LSB noise

But a few channels have higher noise as:

4 LSB noise

or like this:

LVDS timing is OK. All test pattern and PN are fine. I have tried changing analog parameters like BIAS_CURRENT, FLEX_GAIN, tgc 0 etc, but noisy channels are always noisy.

What could be the issue?