SBAS683B August 2014 – May 2020 ADS1120-Q1
PRODUCTION DATA.
The internal multiplexer offers the option to short both PGA inputs (AINP and AINN) to mid-supply (AVDD + AVSS) / 2. This option can be used to measure and calibrate the device offset voltage by storing the result of the shorted input voltage reading in a microcontroller and consequently subtracting the result from each following reading. TI recommends taking multiple readings with the inputs shorted and averaging the result to reduce the effect of noise.