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ADS1258: 在采样单端信号时,如果是走内部多路器数据是对的;如果是走外部ADC输入,数据读出来就是不对

Part Number: ADS1258


参考电压是2.5V,ADC供电是0-4.5V,单端采集的电压为0.671V,如果切换到外部ADC输入(外部PGA设置的是2倍),电压读数就是0.44V,不知道是哪里出了问题