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FDC2214: Vsensor Setting

hideyuki sakai
Mastermind 6250 points
Part Number: FDC2214

Dear, Sir.

My customer is cosidering to apply FDC2214 for thier system.

They are asking following question about Vsensor setting.

Please give your advice.

1. Vsensor range from 1.2V to 1.8V is defined on the datasheet. Also lower

    amplitude affect to lower SNR. Does it mean higher amplitude as 1.8V would be

    better than looer amplitude?

2. Just focusing the higher amplitude & conversion result, the conversion result will

    become stable(smaller value shfting) because of the noise influence reduction by

    higher amplitude. Correct?

3. If the amplitude was over 1.8V too much, What kind of side-effect is cencerned?

Please give your advice.

Best Regards,

H. Sakai

  • 0
    TI__Genius 17440 points

    Hello H. Sakai,

    Above 1.8V, the internal ESD clamping circuit can turn on and interfere with the measurements. It's best for the oscillation amplitude to remain between 1.2V - 1.8V for the whole range of target motion, but if this is not possible, it's better to have an oscillation amplitude that is slightly too low. 

    I suggest setting the oscillation amplitude close to 1.8V when the target is either not present or is at its maximum distance. Then the target interaction will reduce the sensor oscillation amplitude. 

    The noise floor should be fairly similar across the 1.2V to 1.8V range, though there may be slight improvements at the upper end of the range.

    Best Regards,