This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LMV7219: Comparator Hysteresis

Part Number: LMV7219

Hi Ti Community

This is a general question on any comparator with internal hysteresis although I am using LMV7219 in my design.

Assume a comparator has a built in internal hysteresis of X mV.

If an external feedback network  is used to implement an additional hysteresis of say Y mV.

Then does the final comparator has a total hysteresis of (X+Y)mV.

Thanks

Diva

  • Hello Diva,

    Yes. The internal hysteresis will add to the external hysteresis.

    So if you have a +1mV internal offset votlage (Vos) and "7.5 mv" internal hysteresis, the trip points at the comparator inputs will be:

    Vos + Vhyst/2 = VthHI
    Vos - Vhyst/2 = VthLOW

    1mV + 3.75mV = +4.75mV
    1mV - 3.75mV = -2.75mV

    Remember that these shifts occur internally to the comparator, so you may not be able to measure/simuate these numbers at the inputs with a DMM. But you will see the effects when actually measure from the output transitions.
  • Hi Paul

    Sorry for my late reply.

    Thanks for clarifying the hysteresis issue.

    Regards

    Diva