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ADS4449输出不对

Other Parts Discussed in Thread: ADS4449

板子上使用了两片ADS4449,模拟电1.9V,数字电1.8V,采样率200MSPS。无论是硬件复位还是软件复位data[2:0]只有两路输出3‘b010,其它六路都输出3’b110,两片ADC的VCM输出分别为0.948V和0.963V,文档上VCM是1.15V。设置14位使能后,在test pattern 模式下,data[2:0]全为0,data[13:3]数据都正常。将寄存器值读出后,都是正确的,alway write 1都对。不知道到底哪有问题。