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I don't see why any PIC should be used here anyway :o

i'm not sue if i follow you malc :o ... not sure you follow us too :o no pun intended ;)

You take the output and plug it directly to the PIC... straight, not much. Sugarless, fat-free, not...

The pot is there for calibration purpose only. inject 10V at the input, then adjust the pot to reach 5v... a bit useless in most case ;)

Oh well, there's some voltage divider and ohm law that i'm not going to explain on a friday ;)

But to me, when at all possible, i try to avoid any kind of trim pot, software calibration is...

Nope... range of 0-2.5 volts only... because this extra 10K in parallel with your POT.

2x1% 10K in serie, your ADC in the middle... a 0.1uF cap and that's it.

If the source handle this load,...

Nah, sorry, not POT for me to measure an external voltage source. ADCIN (or home made ADC conversion routine) would be my suggestion.

Maybe POT/RCTIME would be a last resort when your PIC don't...

you can still use your opamp directly.. the problem here is that your gain will never be 0.5 but 1.5.

This bring at least few solutions. Forget the opamp, and use a simple voltage divider with...