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DAC7731: 负压输出不正常,是怎么回事?

Part Number: DAC7731

使用双极输出-10V to +10V,   外部电源+5V,  +-12V, 正压段输出正常,实测0-9.98V,负压段最低只有-0.7V,输出空载也是如此,问题找了好久,没找到原因,请各位大侠分析一下是怎么回事?谢谢