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OPA2388: Capacitive load

ttd
Mastermind 7920 points
Part Number: OPA2388
Other Parts Discussed in Thread: OPA2328, OPA2325, , OPA2994

Tool/software:

Dear Technical Support Team,

I'm looking for alternative  amp of AD8616.

I selected OPA2388, OPA2328 and OPA2325, however AD8616 datasheet says "up to 500 pF without oscillating".

I'd like to use DAC buffer with G=1 and connect several sensor(include capacitance).

Do you have any other recommend amp for high capacitive load?


Best Regards,

ttd

  • +1
    TI__Mastermind 19157 points

    TTD, 

    Almost all amplifiers will have stability issues driving capacitive loads and capacitance on the amplifier's inverting input.  Precision Labs - Amplifier Series stability section covers why this problem occurs and how to solve the issue with external components.  A common way to solve stability issues is to add an "isolation resistance" at the output of the amplifier.  Different amplifiers have different levels of sensitivity to capacitive load.  The OPA2994 for example, is specifically designed to drive a wide range of capacitance without issue.  If you only care about driving capacitive loads than OPA2994 is a good choice.  If this device doesn't meet some of your specification requirements, than you should choose the amplifier according to your requirements, and include the appropriate isolation resistances to make the amplifier stable. 

    I hope this helps!  Best regards, Art