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LMV841Q Phase Inversion Protection

Nathaniel Wilson
Intellectual 1990 points


Hi,

Will the LMV841Q have an output phase inversion if the non-inverting input is over-driven with 100 uA? Also, is there a current within the specified limit where it might phase invert?

Going over the datasheet there doesn't seem to be anything about potential output phase inversion, just that there was a 10 mA input current limit.

 

Thanks!

  • 0
    TI__Guru 61996 points

    Hello Nathaniel,

    100uA should not be a problem. Most of the current will be conducted through the ESD protection diodes and not the internal stages. The 10mA is the abs maximum continuous current through the ESD diodes.

    Most new designs are designed to avoid inversions. That is one of the things we check for at design time and first silicon evaluation. You would need to go a volt or two past the rails cause inversions in the newer parts, which is prevented by the clamping action of the ESD diodes.

    Just to verify, I checked a simple 841 follower on the bench and did not observe any inversions - even when pumping several mA through the inputs and going 0.5V past the rails. You should not have any problems.

    Regards