Hi Ed, Welcome to the TI E2E Forums! Do you happen to have a schematic of the ADS1263 in your problematic circuit that you could share? I am currently wondering how you have the ADC grounds connected...Do AVSS and DGND connect together when you supply the analog supply on the ADS1263 from 5V? If there is ground bounce on the CLKIN pin it might be able to trigger the external clock detect circuit. However, what doesn't make sense to me is how the ADC would continue to function if no external clock was being provided. So another question, is it possible that the 0x64 byte is actually a part of the data, and not the STATUS byte value? Best regards, Chris
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