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TLV9301: What are the input impedance and output impedance of TLV9301 and TLV9351

Part Number: TLV9301
Other Parts Discussed in Thread: TLV9351,

Hi team,

May I know that what are the input impedance and output impedance of TLV9301 and TLV9351?

Thank you.

Best Regards,

Cindy

  • Hi Cindy,

    the input impedance is give in the datasheets. Look under "Input Capacitance" in section 6.7.

    The "Open-loop output impedance" is also given in section 6.7. See also figure 25 and 26.

    The "Closed-loop output impedance" is not given in the datasheet because it heavily depends on the set gain ("closed-loop gain") and by this on the feedback factor ("loop gain") of OPAmp circuit:

    "Closed-loop output impedance" = "Open-loop output impedance" / (1 + "Loop Gain").

    With

    "Loop Gain" = "Open-loop gain" / "Closed-loop gain"

    Keep in mind that the "Open-loop gain" is heavily frequency dependent. The "Open-loop gain" plots can also be seen in the datasheets. See figure 7 and 10.

    Kai

  • Hi Cindy,

    In addition to Kai's reply, please see this forum post for an explanation on how to calculate the input impedance of an op amp.

    Hi Kai,

    Thank you for the help!

    -Tim Claycomb