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Help sought regarding EVAL-AD7746EBZ

Question asked by vamsi on Feb 26, 2013
Latest reply on Mar 11, 2013 by seanbrown

Hi,

  I'm trying to prototype a level sensor. It has base capacitance of 24pF. Dynamic range is roughly 24pF - 96pF. In addition to this I will use 30-50cm shielded cables to connect electrode. This is a floating capacitor.

I understand I need to extend the range. I would like to use EVAL-AD7746EBZ for prototyping.

 

Is there provision on this evaluation board to extend the range using range extension circuit?

Do I need to add parasitic capacitance due to cables to base capacitance while calculating range extension circuit parameters?

Please suggest.

Thanks in advance,

Vamsi

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