> IIRC, you control the time the sample and hold has to sample the input.
>  If you had an opamp which could charge the hold cap very quickly, then
> you can make that window very small.  But it will always take a finite
> amount of time to sample the input.
>
> They gave us the ability to control the size of this window so we could
> have high impedance inputs (less than 10k) feeding into it and still get
> good readings.

There seems to be a misconception here.  There is no sample and hold except
for the brief time that a conversion is in progress.  The PIC by itself can
not capture an analog value and then convert it some time later.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.