Hello Bob, Apologies for the ambiguity, and thank you for taking the troubles. Both AVDD and DVDD are driven at stable 3V3. There is no relationship between VSS and IVSS. They are completely isolated and denote two different systems which, although present on the same PCB, have no relationship with, and no electrical connection between each other. I shared that part of the schematic only to prevent any confusions while reviewing the Gerbers. You are perfectly right about EN2. It is pulled low by default in order to ensure that the Voltage Regulator (U2) is disabled until it is intentionally enabled through J4. Yes, EN2, as well as the outputs of U2 (AVDD and DVDD), are decently stable, both during ON as well as OFF states. I would like to emphasize again that both the AVDD and DVDD lines are decently stable. Yes, I understand that the ADS122U04 is not fully-duplex, and have taken appropriate measures to take care of the communication with it. However, the major point of concern, here, is not just the miscommunication with ADS122U04 , but the strange behaviour of the ~RESET pin, which is the root cause of all the symptoms we have discussed so far. Looking forward to your reviews on the Gerbers. Thanking you, and awaiting your response, Abbas.
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