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Datasheet of AD7745

Question asked by nom on May 27, 2014
Latest reply on Jun 2, 2014 by nom

Hi,

 

Now I consider to use AD7745 for capacitance sensor and have a question below about the datasheet.

 

Q.1:About the "ppm of FS/°C" for "Gain Drift vs. Temperature" on page 3, What is the value of F/S, is that 8.192pF or 4.096pF ?

 

Q.2:About the "ppm of FS/°C" for "Drift vs. Temperature" on page 3,

      The value of F/S is setup value of CAPDAC? or full range of CAPDAC which is 21pF?


Q.3:When I compare the maximum value and minimum value of above, the sign is converse like below.

      "Gain Drift vs. Temperature": -28 to -24 ppm of FS/°C

      "Drift vs. Temperature": +24 to +28 ppm of FS/°C

What kind of relation between these parameter?

       Is there any case that if the CAPDAC was setup some value, temperature drift is cancelled ?

 

Best regards,

Nom

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