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OPA1632: Current leakage or drawn from Vocm

TI-CSC
Genius 9540 points
Part Number: OPA1632

Hello E2E Experts,

Good day.

I am designing the voltage reference source for 32 parallel OPA1632DGNR and I would need to know what is the current drawn from the Vocm pin and I can't find it in the datasheet. Would you be able to provide this information? An approximative value could be enough so I can have a rough estimate.

Found this link, however, it does not contain any information on Vocm pin.

https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/359/opa1632-vocm-pin

Thank you in advance for your support.

Regards,

CSC

  • +1
    TI__Expert 3620 points

    Hi CSC,

    The Vocm is implemented as follows:

    So if your absolute worst case is a full 30V across one of those divider resistors, you're looking at 1mA. If you operate vocm at mid-supply, then it is nominally zero. Do you need exact numbers for the vcm error amp input bias currents? That might take me a bit to track down.

    Best,
    Sam