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DAC7731转换不正确,内部参考电压输出8.7V

Other Parts Discussed in Thread: DAC7731, MAX232

 使用DAC7731的过程中,总是输出不正确,输入0x8000,输出0.7V,2脚输出电压是8.7V,不是10V,两个模拟电压VCC和VSS是使用MAX232串口芯片生成的,分别是-9V和+9.4V,我想做成输出+-5V或者是正负10V的范围,不知,是否可行?谢谢