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Originally Posted by Groth
They don't give an input impedance because it doesn't have one in the traditional sense. It periodically charges a sample-and-hold capacitor:
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Ah. Thank you Groth, an long unused section of my brain suddenly kicked back to life. I think it would probably be safer to use a voltage follower. My intention is to only sample at 1s but that might increase later. It'd let me not worry about the thermistor current. Although low component count is a priority, accuracy is more important.