JAJSGG2C October 2018 – June 2019 ADS125H02
To user calibrate, apply the calibration voltage, acquire conversion data, and compute the calibration value. Write the computed value to the corresponding calibration registers. Before starting calibration, preset the offset and full-scale registers to 000000h and 400000h, respectively.
To offset calibrate, short the inputs to the system and average n number of the conversion data. Averaging conversion data reduces noise to increase calibration accuracy. Write the average value of the conversion data to the offset registers.
To gain calibrate using a full-scale calibration signal, temporarily reduce the full-scale register by 95% to avoid any output clipped codes (set FSCAL[2:0] to 3CCCCCh). Acquire n number of conversions and average the conversions to increase calibration accuracy. Compute the full-scale calibration value as shown in Equation 7: