Keith L. Kovala wrote:
> While on the topic of jittery A/D conversion, will the use of an
> external osc provide better stability in the A/D conversion as well?

I doubt it.  The important thing is that the minimum Tad time requirement is
met.  As long as you set up the divider so that Tad is met with a
comfortable margin, but not way too long, I don't see how the clock speed
makes a difference.

By the way, I've found the PIC A/Ds to be very stable.  If youre readings
are jittery, then there is noise coming in from somewhere.  Is the input
signal properly filtered, of low enough impedence?  Have you given attention
to ground return currents of other parts of the circuit to make sure they
don't cause a measurement offset?

In any case, it's a good idea to read the A/D as often as you can manage,
then low pass filter in software for the final answer.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads