Date:          Mon, 1 Jun 1998 07:51:55 -0400
Reply-to:      mjb@hazmat.com
From:          Matt Bennett <mjb@SCDH-99.UMD.EDU>
Subject:       Re: 16c74A incorrect ADC result (long)
To:            PICLIST@MITVMA.MIT.EDU

PIC development writes:
>
> Has anyone who has used the example code for the A/D convertor
> on the 16c74A noticed "leakage" between channels?
>
> I don't know if it's because I'm not waiting long enough
> for the internal capacitor to settle or what, but I seem
> to get slightly different values read from AN2, depending
> on the voltage on AN1.

Yes, I have seen the same effect - it seems to occur especially if
AN2 is being driven from a (too) high impedance source (100 kOhm pot
to save on power usage, for example).  Besides providing a lower
impedance source, increasing the sampling time should help.

Hope that works..

Cheers
  Roland
should help