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DAC7728: DAC7728双电源供电不能对称输出

Part Number: DAC7728

在双电源供电情况下,offset为默认值,值配置了一个config寄存器为12'h818,配置为放大倍数为4,校正系统关闭,输入从0一直加到4095,为什么我的输出不是对称的,并且A通道的输出偏置还和B通道不一样

下图为B通道的一个Vout输出,offset寄存器为默认值

并且上电复位的值也和数据手册理论值不一致