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INA199: Zero-Current Condition (compared to INA181)

Brian Angiel
Expert 4170 points
Part Number: INA199
Other Parts Discussed in Thread: INA181,

I initially specified INA181 current sense amplifier for current measurement in one of my designs. However, the datasheet seems to indicate that a zero-current condition would yield an offset voltage on the output because of the non-zero common-mode voltage on the input of the amplifier.

 

From my understanding, the INA199 does not have this problem and would yield the same output regardless of the common-mode voltage.

 

Would you be able to confirm this? Thanks!

Thanks,

Brian Angiel

  • 0
    TI__Mastermind 32700 points

    Brian,

    Both the INA181 and the INA199 will have an offset.  You can calculate the worst case if you know the other parameters in your system.  Such as the common mode voltage of your system.  The INA181 was a VOS specified at 12V VCM and 0V VCM.  While the INA199 has the VOS specifed at 12V VCM.  Please also be aware if you are connecting the Reference pin to GND you need to be aware of the swing to GND is limited on each of these devices.