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IVC102 with large external capacitors

Mikael Evander
Prodigy 10 points
Other Parts Discussed in Thread: IVC102

I'm looking at using an IVC102 amplifier for integrating a current from a PMT. The expected range is within 1 nA - 5 µA and the requested integration times are in the second range. To not saturate the sensor (if I've understood things correctly) I would need to use a large external capacitor to do this (µF). 

Would this be expected to work, considering that my capacitor would be several orders of magnitude larger than the internal ones?

Many thanks and best regards

Mikael

  • 0
    TI__Guru* 93105 points

    Hello Mikael,

    The fundamental operation of the IVC102 should be maintained depsite the long integration time and large integrator capacitor proposed. 

    The main concern will be the quality of the integrator capacitor. Capacitor related leakage current could be an issue if it is significant relative the current level being inetegrated. The second paragraph, under the Choosing CINT section of data sheet page 8, discusses the types of capacitors best suited for the ecternal CINT. A large external capacitor will swamp the much smaller internal capacitance and will dictate the capacitor's contibution to the circuit's behavior.

    Regards, Thomas

    PA - Linear Applications Engineering