Robert Mash wrote :

> This
> would imply that the successive approximation a2d has no
> absolute voltage
> reference, and is dependent on supply voltage.



From the manual (page 41) :

"There are two options for the voltage reference to the
 A/D converter: either VDD is used, or an analog voltage
 applied to VREF is used."

And the reference is always equal to full scale...

Jan-Erik.

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