OK then - we have a few videos on the web describing how to drive the input and reference of a SAR converter. Please review these videos and try to verify that there is nothing influencing the reference and/or analog input. https://www.ti.com/video/series/precision-labs/ti-precision-labs-analog-to-digital-converters-adcs.html?keyMatch=Driving%20a%20SAR%20ADC&tisearch=universal_search# From there, expand the SAR ADC input driver (7) and Driving the reference input on a SAR ADC (6) topics., these should give insights on where to do further debugging.
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