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MSP430F235: ADC12 accuracy and calibration

Part Number: MSP430F235


In our design based on the MSP430F235, we use the ADC12 (Vref = AVCC=3.3V and ADC12OSC is used as ADC source clock).

We notice that the values in ADC12 registers are higher than expected (let's say about +10).

I was wondering if i have to use the CAL_ADC_OFFSET and CAL_ADC_GAIN_FACTOR values available in the TLV.

If yes, where could i find source code examples to use these values ?

If no what could be the root cause of our problem ?