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LF411: BAL pins unconnected

Didier Negretto
Prodigy 10 points
Part Number: LF411

Hi all,

I need to use the LF411 amplifier for a project (i.e. replacing it is not possible). I could not find much information about the balance pins (i.e. pins 1 and 5).

If it is not necessary to trim the input offset voltage, is it possible to leave the balance pin unconnected ?

If the balance pins are left unconnected, what input offset voltage should be expected ?

Best,

Didier Negretto

  • 0
    TI__Mastermind 20402 points

    Hello Didier, 

    Welcome to e2e :) 

    Leave them unconnected and do not connect anything to the pads. These pins can inject noise into the input stage, so keep "noisy" devices or signals away from pins 1 and 5 so they do not couple in.

    All the best,
    Carolina 

  • 0
    Guru 140200 points

    Hi Didier,

    Didier Negretto said:
    I could not find much information about the balance pins (i.e. pins 1 and 5).

    You may want to have a look into the original datasheet from National Semiconductor:

    lf411_original_ns.PDF

    Didier Negretto said:
    If the balance pins are left unconnected, what input offset voltage should be expected ?

    You will see the input offset voltage as specified in the datasheet.

    Kai