Hi Vichu, Welcome to TI's e2e Community. There are no internal calibration registers in the ADC128S102 , I do not think the EVM is calibrated. The output codes in decimal are converted to voltage with the following formula: Vin = (ADC Code/4096)*VA. The EVM board sets VA=3.3V by default, You can use an external reference or supply from 2.7V to 5.25V as well. Regards, Keith N. Precision ADC Applications
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