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FDC2214: Capacitive measurement

Cedrick
Expert 8270 points
Part Number: FDC2214
Other Parts Discussed in Thread: FDC1004

Hi,

Good day.

Our customer is in need of making capacitive measurements with a range around 0fF to 10pF with a resolution of ideally 10aF. Would FDC2214 the correct IC for this case or would you recommend another IC?

Thank you for your help.


Regards,

Cedrick

  • 0
    TI__Mastermind 18545 points

    Hello Cedrick, 

    The FDC2214 is designed around sensing the change in capacitance rather than measuring capacitance directly and has a noise floor of 0.3fF. It would be a tough challenge to get the desired resolution using this part. 

    Our other capacitive sensing part FDC1004, has active shielding which helps in high resolution applications, but has a measurement resolution of 0.5fF. Getting the 10aF resolution is not something that our FDC lineup can support at this time. 

    Best Regards, 

    Justin Beigel