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DP83822HF: How adc works for this IC?

Part Number: DP83822HF

We met some noise problem that is crc error usually reported and even disconnect when servo motor current becomes big.no isolation between dc bus bar ground and DP83822HF ground.

so i doubt that adc sampling may has wrong sampling for nosie disturbing and i am curious about how adc works for this ic,where power supply is from for adc,is there any filter for adc?

do you have comments for other cause of this issue?