I don't see any reason to have the op amp between the divider and the ADC.
If the 0-10V source can drive a 20k load, I'd just have your 10k/10k
voltage divider directly drive the PIC input pin. I'd use resistor
networks for the resistors to try to get the temperature coefficients to
match and the temperatures to match. Most PIC ADCs can take a 5k source
impedance with full accuracy (your 10k/10k voltage divider would have a 5k
Thevenin resistance (assuming a 0 ohm resistance for the 0-10V source).

If you're measuring a bunch of pots, it'd be nice to drive the pots with
the same 5V source as the ADC reference. Then you don't have errors from
the voltage divider or mismatch between the pot voltage source and the ADC
reference.

Good luck!


Harold
(The ideal design has zero parts).


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