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ads1220 IDAC

Other Parts Discussed in Thread: ADS1220

目前有这样一个问题,我制作的ADS1220测温设备,一共10台,冷端用PT100,两线制,长度约2厘米,每台冷端测量一致性很好,但是每台和每台之间测量有0.5度左右的误差,REFT用的3.24K  精度0.1%。这是什么原因呀?我猜测是不是每个ADS1220  的IDAC产生的电流源有误差呀?咱们的每个ADS1220 电流源误差有多大呀,AIN0输出250ua,AIN1也输出250ua,目前用的这种模式,请TI技术人员看看,谢谢