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ADS805电路是参照数据手册Fig5和Fig7设计的
采集电压范围0-5V，内部参考电压，采样频率20MHz
为测试电路的正确性，将Signal串1k电阻接GND，单片机采集的电压为0.3V
用万用表测各引脚的电压为：VCC=5.1V，Signal=0.3V，VREF=2.48V，REFT=3.72V，REFB=1.24V，CM=2.28V
请问，为什么会出现0.3V的偏差？
IN 是单纯的模拟输入口, 如果输入的是工作范围內的信号, 就不应该有偏置电压出现呢
