AD9716 Full-scale Current Accuracy

Hello team;

We are setting AD9716 Full-scale Current as following: enable the internal on-chip 16k ohm Rset; Vref=1V; by which we can get a full-scale current=32* Vref/ Rset=2mA. While by test we found the current is only 1.6mA instead of 2mA. Is this error caused by the big tolerance of internal 16k ohm Rset? How accurate is this Rset and how accurate current we can get by this way?