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ADS7841测量范围减为一半。

Other Parts Discussed in Thread: ADS7841

ADS7841,4通道,12bit,VCC与Vref都是+5v,按说0-5v对应输出为0-4095,为啥我测得的是0-2.5v对应的0-4095?2.5v以上又重新开始对应新一轮0-4095?(0-2.5v对应0-4095;2.5v-5v对应0-4095)
并且如果我只用通道0,其他通道悬置,其他通道上也会测得2v左右的电压,这是为什么?
求大神指点!