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ADS1158数据采集错误

Other Parts Discussed in Thread: ADS1158

我使用ADS1158去读取直流信号。在自动模式下,单端输入,chop=0,bypass=0,当输入电压为0.5v时,读取数据为0.489v,当输入电压为1.5v时,读取数据为1.46v,当输入电压为3.3v时,读取数据只有3.05v。而读取供电电压和参考电压数据偏差便很小。为什么输入电压越大,读取数据偏差越大?