Hi Umut Kilci, The design of the internal reference is based on a connection to AVSS and if connected to some other point (such as DGND using bipolar supplies) the REFOUT could oscillate and not be stable. So you should modify your board to connect both REFCOM and AVSS-SW to DGND. It is possible that this miswiring is causing the issue you are seeing Are you generating higher voltage bipolar supplies and then using LDOs to regulate them? Or some other supply configuration? -Bryan
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