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DAC121S101接到恒流源输入端后满幅输出异常

Other Parts Discussed in Thread: DAC121S101

原理图如下。做出的板子,DAC121S101正常情况下满幅度输出有4.97V。万用表测出来的。接到恒流源输入端后输出就只有4.77V,

模拟示波器测都少了一小截。 想向论坛里的求助一下这是啥原因引起的。