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LM211-EP: Parameter shifts at Hot/Cold conditions

Marshall Hammond
Prodigy 60 points
Part Number: LM211-EP

Is input offset voltage expected to shift with temperature?  Is the direction of shift expected to trend with temperature (ex: shift up with high temperature, and shift down with low temperature or the reverse)?

Is voltage output low expected to shift with temperature?  Is the direction of shift expected to trend with temperature (ex: shift up with high temperature, and shift down with low temperature or the reverse)?

  • 0
    TI__Guru 53946 points

    Hello Marshall,

    Offset voltage is random - as it is dominated by the miss-match of the input transistor pair. So it could be a positive offset or a negative offset - depending on which transistor is bigger or smaller. Remember that the Offset Voltage number in the table is a ± number (±3mV).

    So we can't really say that colder or hotter makes it drift one way or the other. It's random on which way it will go.

    The offset will tend to drift in the direction of the current offset. A positive offset will tend to drift more positive, or a negative offset can drift more negative. Offsets can also cross through zero and change signs as they drift if they are close enough to zero.

    Bipolars get worse with heat. So the output "low" voltage would slightly rise with temperature. Unfortunately, there are not any graphs over temperature, but the output low maximum is 400mV at 8mA according to the table.

    See the following TI Labs

     https://www.ti.com/video/series/precision-labs/ti-precision-labs-op-amps.html

    See the "Input Offset Voltage" and "Input and output limitations" sections for more information.