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REF02提供给AD0809基准电压时,输出电压为何变化

Other Parts Discussed in Thread: REF02

我使用REF02提供+5V基准电压,电路使用芯片说明书中的标准电路,万用表测量6脚output输出是+5V,连接到AD0809的Vref(+)12脚,REF02的4脚GND连接到AD0809的Vref(-)16脚后,测量REF02的6脚output输出是2.25V,不知道这是为什么?