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为什么DAC8562的Vrefin/Vrefout脚输出电压为0

Other Parts Discussed in Thread: DAC8562

使用DAC8562的内部参考电压,Vrefin/Vrefout脚直接连接一个104的瓷片电容到底,为什么Vrefin/Vrefout脚的输出电压是0啊,正常应该是2.5V吧?为什么呢?