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ADS1256误差很大

Other Parts Discussed in Thread: ADS1256

我用ADS1256采集0-5V信号,PGA=1 ,关缓冲。参考电压设定为2.5V(精密基准源),采集AIN0的值,当AINP1和AIN1 短接时,输出1.018mV电压,AINP1和AIN1 电压为2.5016V,时输出2.4988V,相差2.8mV,AINP1和AIN1 电压为4.9984V,时输出4.9916V,相差7mV.误差很大,是怎么回事啊?