> -----Original Message-----
> From: Alan Shinn [SMTP:alshinn@MINDSPRING.COM]
> Sent: Thursday, July 04, 2002 9:41 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: Precision 0.5V reference for AD
>
> Why not just use 2 precision resistors to make a voltage divider off of
> your 4.5 volts. If that's not close enough, just trim it in with your
> voltmeter and 1 more small resistor in series with the appropriate
> resitor (or a large value in parallel)
> Or do you want to manufacture these circuits?
>
>
The reference inputs on the PIC A/D can take up to 1mA during the aquisition
phase, so you'd want as low source impedance as possible if accuracy is
important.

Regards

Mike

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body