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AD5700/AD5700-1 Input Z to HART_IN Pin?

Question asked by Phil-C. on Jul 30, 2013
Latest reply on Jul 31, 2013 by tjohnson

I'm not finding any input specification (or application examples) for the HART_IN pin that implies its input z and/or bias current requirements.  Specifically, I'm wanting to use the part's internal filter option and am undecided how to apply protection without knowing the latitude I have to add external series limiting.  My supply rail will be 3.3V when powered-up or 0V when powered off (hence my question re. Rx/Tx loading when the part is not powered).  Suggestions?

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