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DAC7614 vss电压工作异常

Other Parts Discussed in Thread: DAC7614, LM2776

    最近在使用DAC7614时发现如下现象:
     供给IC的-5V VSS电压会变成 -1.8V
请问这个现象正常么?如果不正常一般是由哪些原因引起的呢?-5V由LM2776提供.