SBAS925A August 2018 – November 2018 ADS1119
The ADS1119 does not offer any self-calibration options. However the internal multiplexer offers the option to short both inputs (AINP and AINN) to mid-supply AVDD / 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. Take multiple readings with the inputs shorted and average the result to reduce the effect of noise.