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LF398-N: Leaving offset pin floating and adding a MUX stage

Amr Wael
Intellectual 340 points
Part Number: LF398-N

Hello i have few questions regarding LF398AN/NOPB ,

1) If I am not planning to use the offset trimming feature can I leave it floating or should it be tied somewhere?

2) I am planning to use an analog multiplexer before the LF398AN/NOPB in order to multiplex 2 analog input signals. Is it ok to directly cascade the multiplexer to the IC or does it require a voltage follower (Buffer) stage between them?

Thank you very much in advance.

Amr

  • +1
    TI__Guru* 93105 points

    Hi Amr,

    1) If I am not planning to use the offset trimming feature can I leave it floating or should it be tied somewhere?

    Just let the offset pin float.

    2) I am planning to use an analog multiplexer before the LF398AN/NOPB in order to multiplex 2 analog input signals. Is it ok to directly cascade the multiplexer to the IC or does it require a voltage follower (Buffer) stage between them?

    The LF398AN input impedance is on the order of 10 Gigaohms so it should not be necessary to use a buffer between the multiplexer output and S/H input.

    Regards, Thomas

    Precision Amplifiers Applications Engineering