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INA240 Reference divider accuracy

Toshio Ushikubo
Mastermind 9620 points

Other Parts Discussed in Thread: INA240

Hello,

 

INA240 datasheet page 5 has “Reference divider accuracy: 0.02% typ, 0.2% max”.

 

Please advise how to calculate error voltage that should be add to offset error when VREF1=GND and VREF2=VS like Figure 28.

For example, error voltage max = VS x 0.2% or (VS/2) x 0.2%.

 

Best Regards.

  • 0
    Prodigy 70 points
    As far as I understand the datasheet, the percentage refers to the divider ratio. I.e. the ideal ratio is 0.5. With max tolerance of 0.1% (according to revised datasheet october '16) you get between 0.4995 and 0.5005. I.e. with a 5V supply, the offset is between 2.4975V and 2.5025V. Thus, the output error is +/- 2.5mV
  • 0 in reply to nphansen
    TI__Mastermind 36740 points

    Hi Toshio-san,

     

    It would be latter, (Vs/2)X0.1%, the max spec is 0.1% instead of 0.2%. The equation is in the spec table on the same line you quoted.

     

    Above, Nphansen’s explanation is another way of looking at it.

     

    Regards,

    Guang-Apps CS Products