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DAC8811: 信号输出不对

Part Number: DAC8811
Other Parts Discussed in Thread: OPA277

使用TI的DAC8811 做DA 用,下图为电路图(C19换成了0欧姆),但是DA出来的信号完全不对 (U8为OPA277)

我看了一下信号,下面几个图分别为CS -- CLK  ,  CS-- SDI,  CS--Iout,  CS -u8 -6PIN的示波器观测结果(黄色为CS),感觉完全不对,我VDD加的是3.3V,  Vref为5V,请问是是哪里用的不对么,