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DAC8581输出异常

Other Parts Discussed in Thread: DAC8581

你好,在做DAC8581时遇到一个奇怪问题:

我的参考电压Vref为2.5V。以下电压均可正常输出:

  +Vref ,-Vref /2, 0,-Vref/2 ,-Vref/2(即是2.5v,1.25v,0v,-1.25v,-2.5v)。

   但是,除了以上电压,均不能正常输出(也就是说,我想输出其它电压,SPI发送完成后,DA输出电压不变)。

  示波器测得时序及信号均没问题。恳请专家帮我分析分析,谢谢。