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ADS1256负压采集不正常问题

Other Parts Discussed in Thread: ADS1256

您好,我在用ads1256进行数据采集,采用差分的方式。AIN0作为正端,AIN1作为负端,采取的量程范围是-2.5V~2.5V,实际读取的时候发现输入电压为正的时候采集的AD值是对的,输入电压为负的时候采集值是错的。测量过基准电压,基准电压在采集过程中保持不变,输入电压的范围在量程内。请问,这可能是什么原因导致的呢?谢谢!