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INA240: How to calculate accuracy of INA series

Eason Tian
Prodigy 530 points
Part Number: INA240

Hi Expert,

For current sensing, customer usually give a target current accuracy, for example 0.01%. If I only use ADC,  the accuracy should be 1/2LSB(~14Bit ADC for 0.01%).

I want to know, when I use a INA240+14Bit ADC, how to calculate the accuracy? 

Thank you.

Eason

  • 0
    Guru 140200 points

    Hi Eason,

    this is explained in detail in section 8.4.4 of datasheet.

    Kai

  • +1
    TI__Mastermind 26475 points

    Hello Eason,

    I agree with Kia and that is the most complete way to calculate as it also Reference Error.  We do have some calculators.  On the INA240 product page you can scroll down and see a calculator.  Keep in mind that the largest source of error could be your Rshunt.  

    Also there are other calculator you could use seen here.

    CALCULATION TOOL

    CS-AMPLIFIER-ERROR-TOOL Current sense amplifier comparison and error tool

    This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
    Download
  • 0 in reply to Javier Contreras4
    TI__Prodigy 530 points

    Thanks Javier and Kai!