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LMP90098两个恒流源偏差均在17%以上,不知何故

VA和VIO为3.3V供电,vref=2.5v,datasheet上是+-7%的误差,但是我的电流为:100uA时测出的电流为82.3uA,300uA时测出的电流为243.9uA,不知何故,望解答。谢谢