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INA220 common mode range

Tony Jay
Prodigy 105 points
Other Parts Discussed in Thread: INA220, LMP92064

Dear Community

I want to use the INA220 to measure a low side Rsence where the common mode would go 60mV below the devices GND reference.

Is this possible... I cannot see any information on the common mode range regarding the current sense inputs.

I do see that the absolute maximum limits are -0.3 to +26V but will the device work at below GND without any linearity or other issues?

Many thanks in advance

Tony Jay

  • 0
    TI__Genius 14825 points

    Tony,

    You are correct that there is no information in the data sheet about the performance of the device with Vcm below 0V.  The -0.3V is the tolerance of the silicon process and is the limit to avoid damage, but TI cannot guarantee any specification with Vcm < 0V.

    The is another device that accepts Vcm down to -0.2V and is digital output, the LMP92064.  Could this work in your application?

    If you are open to the idea of an analog output and an ADC, then perhaps the INA210B will work.  It has a Vcm from -0.3V to 26V.

    I hope this helps!

    Jason Bridgmon