At 08:04 PM 2/8/2004 -0700, you wrote:
>I thought I noticed a discussion about minimum +VREF values when USING
>the Mid-Range PIC A/D converter. I using 16F818, but I couldn't locate
>any documentation about such a limit anywhere.
>
>Does anybody know if there is a minimum +VREF voltage and if so, what is it?

It's defined by parameters A21, A22 and A25.

The difference between Vref+ and Vref- must be at least 2.0V (A22)

AND both Vref+ and Vref- must be between AVdd and AVss (or less than 300mV
outside). (A21, A25)

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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