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DAC1282模式输出问题

Other Parts Discussed in Thread: DAC1282

目前使用的DAC1282,电路使用典型电路,如下图

AVDD=2.5V,AVSS=-2.5V,Vref=5V

上电复位后.VOUTP,VOUTN, 以及相连的SWINP,SWINN输出1.25V左右的电压.

读写各寄存器通迅正常,写入与读出验证没问题.

设置完成相应寄存器后:如SINE模式,GAIN=0;freq=50Hz,

REG(0x00)=0x00;

REG(0x01)=0x00;

REG(0x02)=0x00;

REG(0x03)=0x04;

VOUTP,VOUTN, 以及相连的SWINP,SWINN,一直输出1.25V左右的电压.并无相应的变化.

请问这是何故?是否需要设置其它?

谢谢,