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电路图如下，不知为何，总不能输出负电压，当输入为7FFF时，电压为9.97V，当为4000时，电压为7.46V，当为0000时，电压为4.96V，只有为8000H时，电压才为零，这是为什么啊
输出负电压的话，你的C46不是就接反了吗？不过这个影响不大，你用示波器看一下输入的数据序列对不对
