Customer is asking what consequences would be if the EP were connected to AGND.
The data sheet is clear on how the EP should be connected - will connecting to AGND create problems?
The substrate of the AD5754 needs to remain reverse biased with respect to all the N-wells sitting in the substrate. To do this, the substrate should be maintained at the lowest potential which is AVSS. If this is the case there will be no diodes forward biasing into the substrate. If e-pad is not at the lowest (most negative) potential the part operation will not be correct.
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