INA185: measure currents in the range of 1uA to 1A with an accuracy of 1uA.

Marvn Arcangel

Genius 11965 points

Part Number: INA185
Other Parts Discussed in Thread: INA210, INA190

Hi Team,

The customer wants to measure currents in the range of 1uA to 1A, with an accuracy of 1uA. Could the INA185 or the INA210 be able to reliably amplify voltages from 1uV to 1V with a resolution of 1uV? Can you share references? If not, can you provide better devices that can satisfy the requirement?

Thanks in advance.

Regards,

Marvin

over 2 years ago

0 Gerhard Kreuzer over 2 years ago

Expert 2600 points

Hi,

..range of 1uA to...accuracy of 1uA => 100% error.

Are you sure?

With best regards

Gerhard

+1 Joseph Scherphorn over 2 years ago

TI__Intellectual 2550 points

Hi Marvin,

Thanks for your question and using the E2E forum.

INA210 has max input bias current of 35uA and INA185 is even larger, this is problematic for your lower end of current measurement range.

INA190 max input bias of 3nA is more feasible for your application but noise may become issue for level of accuracy desired.

Looking into our available instrumentation amplifiers could turn up more capable devices for this application.

Amplifiers

Amplifiers forum

INA185: measure currents in the range of 1uA to 1A with an accuracy of 1uA.