onit

AD5422 accuracy out of specification

Discussion created by onit on Apr 8, 2016
Latest reply on Apr 22, 2016 by onit

Dear community,

 

I use the 4-20mA current output and cannot achieve the specified accuracy.

Example at 20°C: set value 20mA, measured value 19.9772mA which gives an error of -0.114% FSR.

Such a high deviation is not expected at a constant temperature since the TUE is +/-0.15% FSR over the full temperature range!

 

Several configurations (internal/external reference, Rset, boost etc.) were tested without success. Schematic and measurement results are attached.

Please consider and give a hint. Thank you very much!

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