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ADS7828 Absolute Input Range - Negative Input

Aaron Byman
Prodigy 110 points
Other Parts Discussed in Thread: ADS7828

Hello,

If I configure the ADS7828 CH0 and CH1 as a differential input pair, with CH0 as IN+ and CH1 as IN-. Does the datasheet specified value for "Absolute Input Range - Negative Input : -0.2V - +0.2V mean that CH1 must be keep in this range? My application CH0 and CH1 will range from 0V to 3.3V. Vdd is 3.3V. I must compute the voltage difference between CH0 and CH1. I am currently reading these as single-ended and computing the difference digitally. I would like to move this difference to the analog domain and simply configure the measurement as a diff pair. I am getting stuck though at the above mentioned Absolute Input Range - Negative Input value.

-Aaron