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AD7656/AD7656-1 - problems even after RESET

Q: I have given the AD7656/AD7565-1 a RESET and a valid CONVST signal but I periodically get strange and repeatable data. I have factored out noise from input and timing issue during my debug. What else could I be missing?

A: Ensure a stable reference (if external is used) and proper decoupling. Avoid running digital lines under the devices because doing so couples noise onto the die.