Calibration of the FLEXADC channels can be accomplished by using an external precision calibration source to compute the offset and gain calibration coefficients.

When sampling the calibration value, the user should use a lower rate (for example 10 Hz) to obtain the highest precision and stability. The calibration value can be rechecked periodically to obtain excellent accuracy over temperature changes. Finally, when sampling the calibration data, several readings (recommended 64 to 128) should be taken and averaged to lower as much as possible the measurement uncertainty.