AD7779 pH, EC and temperature


For a PLC like application I have to design a module that measures temperature (PT1000, 2-wire), pH and EC (2 electrode kind).

I'm using CN0398 and CN0359 as reference material.

The pH and temperature conditioning circuits are known to me but an EC measurement is new.

Due to the tight space requirements I would like to use the AD7779.

As I see it this would negate the need for the additional S&H amplifiers as used in CN0359 due to the AD7779' simultaneous sampling.

I'm I correct in this assumption? Do you see some issues with this approach?

The additional 50/ 60Hz filtering can be done in software.


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