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OPA191: I have some question about Absolute Maximum Ratings

Jimmy WANG
Genius 4085 points
Part Number: OPA191

Hi team,

As datasheet Absolute Maximum Rating description.Signal input pins (Differential ) is (V+) – (V–) + 0.2 V.

If the V+,V-  supply are +-3.3V. when input signal is IN+ is -5V, IN- is 0V. this situation will damage the device? or any impact?

when this condition and just limit input current  <10mA. Is ok or not? thanks

  • 0
    Guru 140200 points

    Hi Jimmy,

    maximum differential input voltage would be 3.3V - (-3.3V) + 0.2V = 6.8V. So your 5V differential input voltage would not be a problem. But -5V is exceeding -3.3V by more than -0.5V. So the common mode input voltage would violate the absolute maximum ratings.

    Limiting the input current below 10mA (better below 1mA) will make the OPA191 survive this torture. But dynamic performance may suffer.

    Kai

  • 0
    TI__Guru* 93105 points

    Hi Jimmy,

    Do you have a particular amplifier circuit in mind in which you would apply the OPA191 under the said conditions? Sometimes the amplifier circuit design itself with its gain or input divider resistors provide sufficient current limiting, and then nothing more needs to be added.

    Regards, Thomas

    Precision Amplifiers Applications Engineering