Hello, It sounds like the source of the issue is likely the reference. The reference input is compared to the input signal within the device to measure the output signal. If there is drift or oscillation in the reference input, then this will reflect at the output. You mentioned that there is another board with a different ADC, to eliminate the device as the source of the error, would it be possible to test the ADS7953 on the other board? Regards Cynthia
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