Hello!
I was wonder if it's OK to input voltages above the ADC Reference (0,6 V) to the SAR Core, while keeping within AIN pins well within 0 V and VDD.
We're measuring AC voltage over shunt resistor and the initial idea was to keep the Internal Gain at maximum value and adjust it smaller if we get close to ADC saturation. This would allow good resolution even at smaller resolutions. This would mean that from time to time the result from gain will most likely exceed the 0,6 V reference voltage.
(In scenarios below voltages to AIN pins would always be above 0 V and below VDD)
For example, if we're designing for a maximum shunt voltage of +- 0,6, with a bias voltage of +1,8 V, and initial gain of 4, the result will indeed be saturated but shouldn't damage anything, right?
Additionally, if the GAIN is trying to output a value above VDD or below VSS, will it simply saturate and not damage the chip or do we need to have additional protection?
I couldn't find a reason not to do this from the datasheet, so is it safe to try?
