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(ADuM3190)About "1% accuracy"

Question asked by donadona999s on May 10, 2018
Latest reply on May 16, 2018 by donadona999s

Hi!

 

I have a question about ADuM3190.

At this thread, What does the 1% accuracy of the ADuM3190/4190 include? it says

"The 1% accuracy specification includes the use of the ADuM3190/4190 in an 
isolated feedback loop and includes drift over temperature from -40˚C to 125˚C.".

 

At your datasheet, 1% accuracy was measured by Figure 27 circuit.

I thought -IN pin voltage will be REF±Input offset = 1.225±5mV.

EAOUT will be same voltage with -IN pin.

So the accuracy should be 5mV/1.225 * 100 = 0.4%.

But datasheet says it is 1%.

Why the value is different?

 

Best regards

Kawa

 

 

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