INA190: Sensitivity of the current sensor

Rajesh Pushparaj

Part Number: INA190

Hi, we are using INA190A1 to sense load current in my circuit.

My doubt is how much a small change can the INA190 sensor can sense.

example:

Min current it can measure is 1uA, it outputs 31mV if the current is 1uA. What is the change in current it can measure from 1uA?

Is it 1.1uA or even less?

Thanks in Advance.

Regards,

Rajesh

over 5 years ago

0 Guang Zhou over 5 years ago

TI__Mastermind 34830 points

Hi Rajesh,

INA190 output is continuous with a continuous input. The concept of step size is not applicable. In other words, it will respond to any infinitesimal increment in its input.

Of course measuring a small change in output voltage is challenging, but that is a different question.

Regards, Guang

0 Rajesh Pushparaj over 5 years ago in reply to Guang Zhou

Prodigy 170 points

Hi Guang Zhou,

Thanks for the reply,

Regarding measuring a small change in the output voltage, is there any application notes for reference?

Thanks,

Rajesh

0 Guang Zhou over 5 years ago in reply to Rajesh Pushparaj

TI__Mastermind 34830 points

Hi Rajesh,

This app note summarizes some of the popular techniques used by test and measurement professionals.

Although it is geared toward low level signals, the ideas are applicable to any precision measurement. You could check it out and these techniques should be helpful in your future endeavors.

Regards, Guang

0 Rajesh Pushparaj over 5 years ago in reply to Guang Zhou

Prodigy 170 points

Hi Guang,

Thanks for your reply, app note is informative. Thanks again

regards,

Rajesh

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INA190: Sensitivity of the current sensor