Fluctuating ADC results - is it normal and characterized in a datasheet?
Yes, the ADC lists those parameters under &quot;DC Accuracy&quot;, meaning even if these DC parameters are non-ideal, it should give same value when sampling an ideal noise-free DC voltage source, assuming it is connected to ideal noise-free DC power supply. Some other additional assumptions may apply as well.
So, in light of this, under non-ideal conditions, fluctuating results due to external sources of fluctuations is normal, but they can't be characterized in the datasheet, because the datasheet won't know what signal you are measuring, how noisy the ADC power supply, and how the signal or supplies fluctuate.