Could you tell me if the PIC16f877 input to the a/d converter work on voltage or current, or do both. For example if I had 5volt input to the a/d converter would the digital represntation for an 8bit converter be 256 and for 2.5volt be approx 128.

Dean Matthews
Reliability Engineering
Ford Engine Plant Bridgend
South Wales, U.K
Tel No:(01656)672597
Fax No:(01656)672558
Email: dmatth14@ford.com
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-----Original Message-----
From: Peter L. Peres [mailto:plp@ACTCOM.CO.IL]
Sent: 26 August 2001 21:49
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: High impedance inputr to PIC A/D


Spehro, look for this document on the National website. I have it here but
I do not know the URL. It contains spice models for a couple of opamps.
The internal schematics are very much like our pnp/npn buffer. Of course
it does not replace a real opamp ;-).

It is called OA-18.pdf or something such. I do not know how relevant this
is to the original question.

Peter

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