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AN-0970 voltage reference

Question asked by fuchsd on Mar 17, 2013
Latest reply on Mar 18, 2013 by MMA



why is the internal votage reference used in AN-0970 source code?  The AN says, that the ADC result is independent of excitation current changes, because the ratio of Vin/Vref ist measured. But in source code the internal reference is used:

ADC0CON = BIT0 + BIT2 + BIT4                // Gain = 32, Unipolar, enable ADC0, Int Reference (clear BIT0 for Gain = 16)

            + BIT10 + BIT15;

Is there any reason?