Part Number: ADS5296A
after init: some fix chan has digital noise: the analog input is zero, but the adc output has some bit has err '1'.
power on the system 6 times, get 1 err init result probably。
the top channel is ok, but the below channel has some err. the analog input is same. when i switch to the test sync pattern or deskew pattern, the result is ok,
like the picture below.
below is my design:
In reply to Xiaochen (Sean)Xu:
I only find one board like this, other boards don't have this problem. so I think the hardware around the adc affect the adc, when I init the adc and sample the analog signal.
I will have ten boards with smt, after some days, I will check the problem then.
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I may try that diode.
After some days, we will have some more boards, I will statistic then.
In reply to jie zhu60:
we will wait for your results from more boards. you can also leave your email and we can have more specific discussion off line. Thanks!
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