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OPA333 input impedance

Longchang Chen
Intellectual 1350 points
Other Parts Discussed in Thread: OPA333

how big is the input impedance of OPA333? it is current FB or voltage FB?

many thanks

  • 0
    TI__Guru 62700 points

    Longchang,

    By definition, the common-mode input impedance of OPA333 is a change of the input bias current, IB, with the change in the input common-mode voltage, Vcm, and may be easily calculated from the graph below:

    Rincm=ΔVcm/ΔIB=~5V/20pA=2.5E+11=~250Gohm