> Hmm so you mean that I should build this up with a 12M7 and a 100K +- > 10K fixes resistor trim pot combination, write the simpler sampling > routine, and finally correct the 1V linearity error by changing the > divider's ratio with the trim pot? > > Jens > Yep, that should do the trick. Try to make it a multiturn trimpot, and pick a good one. Cheapies might have too much temperature drift. (Carbon ~500ppm/C - yuck, Cermet ~100ppm/C - okay, wirewound ~50ppm/C - if you can find one at that resistance).
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