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ADS1281编码转换问题

Other Parts Discussed in Thread: ADS1281

设置条件:

ADS1281设置为 REGISTER MODE, SINC

输出为continues-sync mode,  32bit, 基准电压为+/- 2.5V

问题:

VIN=1V时,得到的32bit数据为: 429496729。

这个数据计算公式应该为:=1*(2^30-1)/2.5

然而根据DATASHEET 24页所描述,LSB为冗余位,所以计算公式应该为 1*(2^31-1)/2.5 =429496729*2

我试了很多其它输入电压,都是这种情况