Hi John, As Mr. Domanski noted in the original post, the internal sample cap does not automatically discharge in the ADC128S102 between samples. If you are having similar problems to those expressed by Mr. Song, you can follow the same advice provided in the original post. There are also a series of TI Precision Labs dedicated to ADC's which you might find useful. One in particular is SAR ADC Input Driver Design which goes through the basics of the sampling mechanism of a successive approximation register ADC.
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