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AD6645-80 Error in ADC Codes


we have designed a digitizer board with 3 ADCs. Two of them are pin compatible adcs from another vendor and one is the AD6645ASVZ-80. We have some problems with this AD data converter!

1. Example: Sampling Frequency 40MHz, Input Sine 10k

The source of this bit toggling is the AD6645. I can measure this also with an analog scope. The fpga works correct.

2. I observed different patterns of error codes. It depends on the sampling frequency. Here's another example

Sampling Freq: 80MSPS, 1k Sine

I think this IC is defective. What should i do?

Best regards,


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