AnsweredAssumed Answered

AD5791 linearity

Question asked by Hanes on Apr 11, 2013
Latest reply on Jun 10, 2014 by msamera

Hello,

 

I have some problem and i need help.

I can control AD5791 and DAC works correctly. If I set bit word on output i can see voltage, but if I measure linearity over all bit range i can see voltage difference. See on Tab1 in attachment.

As reference I used LTZ1000 and in tab1 column is called Urefp(5) and there is not problem. Reference span is 0 to 10V, check in schematic which is in attachment.

I can't find roughly 10mV difference on output.

Can anyone help me or give me some advice?

 

My dac uses offset binary coding and RBUF is set to 1.

PCB is my own. Grounds are connected into one node.

 

Thanks a lot for your replies.

   

    Hanes

 

ps: I apologize for my english.

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