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LMV762MM

R11
Expert 1485 points
Other Parts Discussed in Thread: LMV762

For the LMV762MM on page 2 of the datasheet, the differential Input voltage is Supply voltage. If supply voltage is 3.3Vdc and differential voltage is applying 5Vdc would this cause any damage to the part?  Any concerns?

  • 0
    TI__Guru 51646 points

    Hello Rustin,

    Yes. A differential voltage of 5V would mean that you are exceeding 3.3V in some way.

    There are diode clamps from the inputs to the supplies  - so the inputs cannot go more than a diode drop (0.7V) above or below the supplies. These diodes have a maximum rating of ~20mA.

    If the source is powerful enough, the input can actually "lift" the power supply line (most regulators cannot sink current).

    IF you need to go above the supply, you should add an external clamping diode to the supply AND a series current limiting resistor (~10K is good). Note that the LMV762 is NOT a rail-to-rail input, so you would also be violating the common mode input range spec.

    Ideally, you should attenuate the signal down before applying to the comparator inputs so that they are in the legal input common mode voltage range.

    Regards,

  • 0 in reply to Paul Grohe
    Expert 1485 points

    Great!  Thank you.