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两片AD1274级联,第二片零点偏移严重

Other Parts Discussed in Thread: ADS1274

两片AD1274级联,第二片零点偏移严重,

使用的是F28335的 MCBSP模式,已将两块芯片同步;

第一片采集所有信号正常,第二片零点偏移-0.6V左右,几个通道都是一样的偏移0.6V左右,其他采集信号幅度、信号噪声情况一致,没有问题,可能是什么原因?