Hi Yf, Thanks for your post! As per table 9, 7FFFFFh is the max code while 800000h is the minimum code. Is 2500000 in decimal? Are you using the internal test signal to generate this value as your registers indicate, open input as your post title indicates, or applying an external signal? To get the full scale reading you will have to apply a signal that reaches the full scale input of the ADC. Section 9.3.1.3.2 of the datasheet covers this. A couple of notes from your register settings: Internal test signal 1x-(Vrefp-Vrefn)/2400 Bias buffer powered down Every ch enabled to bias every ch lead off enabled, lead off comparator disabled, config4
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