Bremen- I haven't done any comparison studies (with or w/o a precision voltage source) but I figured: i) it would help the ADC get accurate readings, b) these ICs are available for under 10USD and c) I needed to adjust the logic voltage anyway, it wouldn't hurt to have one. I also cannot speak to the internal vs an external clock, over what the DataSheet notes. Can Musach/ anyone at AD guide on the relative merits of external clock and/or precision voltage on impedance measurement accuracy with AD5933?
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