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AD5755-1 Iout accuracy issue

Question asked by Verti on Feb 28, 2017
Latest reply on Mar 14, 2017 by rrosario

Dear Specialists,

         We are using AD5755-1 and now meet Iout accuracy issue. We design to get 4-20mA Iout.

Based on the datasheet, the Maximum Iout error should be 0.05%.We follow the reference design and use external Rset for better accuracy.

       We test the Iout with one series digital multimeter (keithley2000) ,

        Now if input data "0" , we get 3.99740mA output. If input"65535", we get 20.2269mA

        Does any problems exist with our test method? I also tie the schematic  FYR~

 

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