• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 49 subscribers
  • Views 261 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LMV393: Operation outside the Input Common-mode Voltage Range

Shinichi Inoue
Guru 19671 points
Part Number: LMV393

Dear Specialists,

My customer is considering LMV393 and has a question.

I would be grateful if you could advise.

---

Could you please see attached file（competitor's application note).

According to the application note, 

Even if it exceeds the common mode input voltage range only on one side of the input, it is described that it will output correctly as a comparator.

Does this also apply to TI's LMV393?

---

I appreciate your great help in advance.

Best regards,

Shinichi

gpl_cmp_cmir-e.pdf

  • 0
    Guru 140200 points
    Hi Sinichi,

    have you read section 9.2.2.1 of datasheet of LMV393? Everything is explained there.

    By the way, it's not recommended to exceed the common mode input voltage range, because this can slow down the comparator and erode the timing specifications. It's always better to have the input voltages within in the common mode input voltage range. You could use a simple resistive voltage divider at the inputs to accomplish this.

    Kai
  • 0 in reply to kai klaas69
    Guru 19671 points

    Hi Kai,

    Thank you for your reply.

    Yes, I had already read the datasheet, due to the customer request I posted.

    I understand it has a possibility to slow down when the device exceed the common mode input range.

    I'll share this information with the customer and use within the common mode input range.

    If he has an additional question, I consult you again.

    I appreciate your great help.

    Best regards,

    Shinichi