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ADS1247的转化结果不正确,求助

Other Parts Discussed in Thread: ADS1247

花了好多时间终于调通了ADS1247,但是突然发现转化结果不对,在室温下pt100的阻值是112.2欧姆,但是我用读取到的结果转化后只有89欧姆,

我的电流源选取1mA,Rbias=820,则参考电压为1.64V,增益为4,计算公式为Data*1.64/0x7fffff*1000/4,得到的。电路用的是ti官方的电路,求助啊