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ADS1220

Other Parts Discussed in Thread: TIDA-01526, ADS122U04, ADS1220

请教:我用的TIDA-01526开发板采集温度,

现在我的电路板工作正常。ads122u04的寄存器设置如下:

寄存器0 (63h)寄存器1 (0Ah)寄存器2 (04h)寄存器3 (A1h)

现在我短路一个电阻输入端,另一个输入是由电阻箱输出的1000欧姆电阻。我的Rref是用万用表测得的3892欧姆,得到的adccode值被转换成电阻Rrtd=(m*Rref/增益*2^24)*adccode=976.46欧姆。短路输入端测量信号转化为电阻值约为0.05欧姆,此时我测得Rref两端电压为0.984v,与1000欧姆电阻相连的输入端两端电压为0.253v,这与我选择的IDAC电流值的理论计算值不同。理论上应该是VREF=0.25*3.9=0.975v,vrtd=0.25*1=0.25V,请帮我分析一下误差的原因?

十分感谢!