I am attempting to measure this differential signal using the differential ADC mode on the Arduino Mega 2560. One end of the differential signal has a common mode DC voltage of 1.2V and the other end is a DC signal at 1.2V.
However, when I hook the signal up to the Arduino ADC pins, I don't get the full signal swing in both directions. I've also attempted to use a differential amplifier to convert the differential signal to single ended before inputting to the ADC, but it is also the same result:
Is there a reason why the Arduino op amp is not outputting full swing?
This was cross-posted from: (adc - Inaccurate differential signal measurement on Arduino Mega 2560 - Arduino Stack Exchange)