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Thread: Potentiometer on ADC
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face BY : David VanHorn email (remove spam text)



At 03:13 PM 11/24/01 -0500, Josh Koffman wrote:
>Or how about a 250K pot? Would it really make a difference seeing as I'm
>measuring the relationship between vref and the the analog input?

There's no difference, provided that the chip's input impedance is
infinite, and there's no interfering EMI.
Otherwise, you can calculate the effect of non-infinite input impedance.
EMI is harder to predict, but generally, keeping your source impedance low
keeps this from becoming much of a problem.

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