Hi Cynthia, There was a small amount of noise on the 2V5A reference rail with the 330pF capacitor on its output, and there is some jitter when a sample is taken. I added a 1uF capacitor onto the output of the reference, which caused it to oscillate for some reason. This made the missing code issue in the recorded data worse, which seems to confirm your idea. I will try to improve the reference quality and see what happens. It shouldn't behave like this. The other board I mentioned uses an ADC which is not pin-compatible with this ADC. Furthermore, it uses VA as a reference directly instead of a dedicated reference component. So I can't test this ADC on that board, unfortunately. Can you help me understand why a noisy reference would cause missing codes instead of noisy recorded data? Thank you, Matt
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