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Wide range capacitance to Digital converter

Question asked by Allen_9 on Oct 2, 2015
Latest reply on Oct 2, 2015 by EricC

Hello guys,

 

I'm looking for a capacitance to Digital converter for capacitive MEMS accelerometer with the following specs:

 

1- input range (changing): -+ 300 pF.

2- resolution in the range of few aF

3- parasitic capacitance 150 pF

 

I looked to AD converters and I see AD7746 might be the closet converter to the above requirements but it needs to be upgraded.

 

Could please let me know if the AD7746 is a possible choice, or if it needs to be extended or you suggest another converter. Could also suggest an evaluation board that fits this converter.

 

 

You support is highly appreciated.

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