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DAC7811负压电路输出正压

Other Parts Discussed in Thread: DAC7811

下图为具体电路:

DAC7811由FPGA控制,运放U69将DAC电流输出转变为电压,根据手册描述,Vout=-Vref*code/4096,Vref=2.5V,输出应该只可能是负压,系统在某错误状态下,输出如下:

通道3(蓝色),为DAC输出经运放转变后的电压,可看出为+1.5V,通道1通道2(黄色、绿色)为后级差分运放输出;

DAC7811在哪种错误状态下,或者错误的控制下会输出正压吗?