• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 46 subscribers
  • Views 90 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

INA241A: INA241A: INA241A2 vs INA4241A3

ENRIQUE VARGAS
Prodigy 20 points
Part Number: INA241A

Tool/software:

Dear Support, 

I'm using the INA241A2 (gain 20) with a shunt BVR-Z-R0005-1.0 to measure the triangular waveform of a bidirectional current of +-50A. 

Mi output after the INA241A2 is a differential output where Vrif=2.5V and the output changes from 1V (-120A) to 4V (120A F.S.)

I was considering to use a shunt with less resistance value, the BVR-Z-R0003-1 but changing the INA241 with more gain INA4241A3 (gain 50)

In this case the differential output is Vrif=2.5V and the output changes from 1V (-100A) to 4V (100A F.S.).

In terms of accuracy and noise what INA should have the best performance? (my circuit have offset and gain calibration)

Thank you 

Enrique

  • +1
    TI__Mastermind 34060 points

    Hi Enrique,

    When output level is equal, the A2 option will have better accuracy than A3. Thanks to calibration, the difference due to offset and gain will be zero in theory.

    But A3 option will still have higher noise. You can reduce noise by averaging multiple measurements though.

    Regards

    Guang

  • 0 in reply to Guang Zhou
    Prodigy 20 points

    Thank you so much for your answer.

    The output is not exactly equal because, in the second option, We reduce the Full Scale of the circuit (From 150A to 100A)

    Using  BVR-Z-R0005-1.0+ INA241A2 means that in the -+50A range my span is from 2V to 3V (1V of span: 33mV/A).

    On the other hand, using BVR-Z-R0003-1 + INA4241A3 should have an span from 1.75V to 3.25v (1.5V of span: 50mV/A).

    Although We have more span with A3 , Is it a better option A2?

    Thank you.