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AD7745 with Multiplexer

Question asked by JaDa on Nov 25, 2015
Latest reply on Dec 1, 2015 by JaDa

Hey Guys,

 

i am working on development of a pressure sensor with a matrix-like arrangement of the electrodes.

So i have columns and rows and would like to measure the floating capacities.

The area consists of 25 measuring points and now i consider to place an external analog multiplexer

in front of each Input (CIN , EXC).

Is this possible or does it maybe produce too high additional capacitances, that it exceed the input range of the AD7745?

What do you think?

Does anyone have some experience with this kind of application?

 

Kind regards,

 

Jakob

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