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ads1222 使用问题

Other Parts Discussed in Thread: ADS1222

我使用贵公司的ADS1222IPWT,按照其使用手册连线,在面包板上测试时成功;但再重新做了PCB板后,却出了问题:+5V供电,+2.5V参考电压,关TEMPEN,关BUFEN,CLK为2M,SCLK正常,DOUT频率与MUX相同,也就是说无数据输出.AINP2上如连信号-4.5V时,电流增大250mA,但在AINP1上有-4.8V信号,电流却正常.

请帮我分析一下