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DAC7568 使用过程中默认的Digital Gain改变了?请问是什么原因?

Other Parts Discussed in Thread: DAC7568

芯片: DAC7568A , VDD =3.3 V , Ext Ref=2.5V  默认的 Digital Gain=1;

使用过程中,Vout范围为0-2.5V, 但是有时候,Vout变成了0-3.3V , 输入同样的码值,发现Vout 存在2倍的关系,查看手册里面有写到A,B grade的Gain=1;

C/D grade的Gain=2; 怀疑Gain发生变化了,但是Gain没有通讯指令设置,请问会是什么原因造成的?