What size pot?  You need to meet the impedance requirements.  You also
should have a big cap on it, especially with newer chips I've found.

Andy

At 01:57 AM 12/21/02 -0500, you wrote:
>I have been using PIC chips for a while and it seems that every time I use
>the VRef option when working with AtoD ports on the mid and high end chips I
>cant get the readings to settle down.  I get a rough range of +-5 on my
>readings.   I I tie the Vref to VCC or disable this option it works ok.
>
>
>Is there any hard and fast rules for using this option.
>
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