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Purpose of REF pin on INA215 and reccomendation for similar device

David Sandler
Intellectual 1910 points
Other Parts Discussed in Thread: INA215

Hello,

I am looking looking at the TI high side current sense opamp, ina215:

http://www.ti.com/lit/ds/symlink/ina215.pdf

 

I don't really understand the purpose of the REF pin, could you please give me an explination of what its purpose is in detail?

 

 

Also, we were really happy with the INA216A3,  great price ($0.35ish), BUT it could not handle a common mode voltage of 9-10 volts which our application has.

The INA215 can do this but is $0.65.  Are there any cheaper, or in the words of my customer "better" options?

 

We are looking for a device with a gain in the region of x75-x100 with the current flowing in a unidirectional fashion.

 

Thanks!

David

  • 0
    TI__Genius 14825 points
    David,

    The Reference pin on the INA215 series is used to adjust the output voltage up or down to accommodate bi-directional currents. The front page of the data sheet directly below the simplified schematic table shows the equation for Vout, which incorporates the Vref voltage. The applications section of the data sheet, section 9.2.2, gives an example circuit with a birectional input and makes use of the Vref pin to create an appropriate output swing.

    The INA199A2 looks like it might meet the customer's requirements - $0.50/1ku and Vcm <=26V. You should check the rest of the specs for compliance but this could be an option.

    Best regards,
    Jason Bridgmon