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LMC6772: Input Impedance

Ozer Serif
Prodigy 10 points

Part Number: LMC6772

What is the input impedance for the LMC6772 (or similar products)?  If it is a range, how does the input impedance vary (with voltage and/or frequency)?

Thank you

  • 0
    TI__Mastermind 26730 points
    Ozer
    The input impedance is extremely high Giga ohms
    You can get a feel by looking at input bias current vs input common mode voltage to see how it changes with input voltage. Curves 3 & 4 in the datasheet.
    With respect to frequency, the input capacitance for cmos comparators is generally less than 10pF. So 1/2piFC to get a feel.
    Chuck