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DAC7718输出值和输入对应不上

Other Parts Discussed in Thread: DAC7718

使用DAC7718,VREF值为5V,GAIN值设定为6,OFFSETDAC_CODE值为0,正负15V电源供电,按照下面的公式INPUT_CODE值为2048时输出值为15V,

我现在INPUT_CODE值为256时输出值就是15V。

调整VREF调整为4V时,INPUT_CODE值为1279时输出值就是15V。

请问这是什么原因