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INA169, Basic Current Shunt Monitor

Two Few
Prodigy 10 points
Other Parts Discussed in Thread: INA169

I am using the INA169 to monitor current flow in a test & measurement application. When, for example, 10mV is read across the shunt resister, and the gain is set for x100, then I should expect the device to produce a 1V output. Is this correct?

 

  • 0
    Guru 21975 points

    Two Few,

    Ideally, you are correct. Since 10mV is a relatively low voltage, offset errors of the INA169 will contribute to the offset at the output. The 1mV input offset voltage (max rating) would potentially contribute a 100mV offset at the output. So just looking at the offset errors, a 10mV input could give you a 0.9V to 1.1V output. It would be more correct to say that a 10mV change in the shunt voltage would produce a 1V change in the output voltage (now ignoring the possible gain errors).  To minimize the effect of offset errors, use a larger full-scale shunt voltage.

    Regards, Bruce.