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INA1620EVM: Maximum input voltage for the analog inputs

Mike Davis
Prodigy 230 points
Part Number: INA1620EVM
Other Parts Discussed in Thread: INA1620

Hello,

Just wondering what the maximum analog input voltage is for the INA1620EVM?

  • 0
    TI__Genius 10850 points

    Hi Mike,

    This will depend on the input voltage range of the INA1620 and your supplies (V- and V+):

    -Tamara Alani

  • 0 in reply to Tamara M Alani
    Prodigy 230 points

    Thank you. However I'm a bit confused because this is what it says under absolute maximums:

    And this is of the raw chip, not the EVM board. So I was wondering if there was a resistor on the EVM board that allowed higher input voltage. My intention is to drive it with a DAC that puts out 2v RMS. 

    Thanks,

    Mike

  • 0 in reply to Mike Davis
    TI__Genius 10850 points

    Hi Mike,

    It is not suggested that you operate based on the maximum ratings. Stresses at or beyond these ratings for an extended length of time may cause permanent damage to the device and affect device reliability. These ratings are "stress" ratings and do not imply functional operation of the device. 

    We offer recommended operating conditions and that is what I shared initially with you. 

    -Tamara Alani

  • 0 in reply to Tamara M Alani
    Prodigy 230 points

    Hi Tamara,

    Sorry I’m still a bit confused. The maximum input voltage is rated at +-0.5v, and you're telling me that it's okay to operate at 3x the maximum rated input voltage. Can you see how this may be an issue? Please let me know the actual maximum input voltage that I can drive into the analog inputs of the INA1620EVM using a +-15v supply to power the board. 

    Thanks,

    Mike

  • 0 in reply to Mike Davis
    TI__Genius 10850 points

    Hi Mike,

    The input voltage range is with respect to the supplies. The absolute maximum ratings say you can swing really close to the rails (within 0.5V) but this is not recommended for an extended length of time. The recommended operating condition is to allow more headroom.

    On a +/-15V supplies, we recommend that your input voltage range stays within -13.5V < Vin < 14V:

    (V-) + 1.5 = -15V + 1.5V = -13.5V

    (V+) - 1 = +15V - 1V = 14V

    Does this answer your question?

    -Tamara

  • 0 in reply to Tamara M Alani
    Prodigy 230 points

    Hi Tamara,

    Thank you I understand now.

    Thanks,

    Mike