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LMV339: Output noise of LMV339

Conor
Guru 12655 points
Part Number: LMV339


Tool/software:

Hi,

I have a question about the output noise of the LMV339. I have summarized my inquiry in an Excel sheet, so could you please check it and comment?

TI_LMV339 output noise.xlsx

Thanks,

Conor

  • +1
    TI__Guru 62826 points

    Hello Conor,

    This is normal comparator behavior. When the input voltages are very close, or slow moving, "falsing" or "chattering" on internal (and external) noise can occur.

    But it looks like you have a damped oscillation. Is there a supply bypass capacitor on the supply pins? And also the pull-up voltage, too? That looks like ground bounce.

    Also - you only have hysteresis in one direction due to the diode so only one edge has hysteresis.

    You would have to eliminate the diode, or, place a second resistor in parallel with the resistor and diode to provide somewhat-symmetrical hysteresis.