• Datasheet help

    From Cursitor Doom@21:1/5 to All on Sun Dec 1 15:11:00 2024
    Hi all,

    I cannot see any reference to input impedance on this datasheet. I'd have thought it was a key parameter!

    https://disk.yandex.com/i/kWf8paLDWKn5rg

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  • From Jeroen Belleman@21:1/5 to Cursitor Doom on Sun Dec 1 16:46:03 2024
    On 12/1/24 16:11, Cursitor Doom wrote:
    Hi all,

    I cannot see any reference to input impedance on this datasheet. I'd have thought it was a key parameter!

    https://disk.yandex.com/i/kWf8paLDWKn5rg

    (The link shows the LM124/LM324 datasheet. You could have
    told us up front.)

    Not really.

    If it's important to you, choose one that has that spec.

    Jeroen Belleman

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  • From Phil Hobbs@21:1/5 to John R Walliker on Sun Dec 1 19:19:31 2024
    John R Walliker <jrwalliker@gmail.com> wrote:
    On 01/12/2024 15:46, Jeroen Belleman wrote:
    On 12/1/24 16:11, Cursitor Doom wrote:
    Hi all,

    I cannot see any reference to input impedance on this datasheet. I'd have >>> thought it was a key parameter!

    https://disk.yandex.com/i/kWf8paLDWKn5rg

    (The link shows the LM124/LM324 datasheet. You could have
    told us up front.)

    Not really.

    If it's important to you, choose one that has that spec.

    Jeroen Belleman

    The data sheet is from 1995, so whatever you can buy now will be
    slightly different. You do get the input bias current and input
    offset current, so you can derive something useful from that.

    The TI data sheet gives more information for the LM324B:

    ZID Differential 10Mê || 0.1pF
    ZICM Common-mode 4Gê || 1.5p

    John



    The 324B is a somewhat different part.

    Cheers

    Phil Hobbs

    --
    Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics

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