配置成buffer关,PGA=1,差分输入,采样率2K,在输入1.5V(使用干电池)条件下测得噪声为13uVrms,将电池1.5V通过电阻分压得到6.5mV再输入时测得噪声为4.9uVrms,这个才比较接近手册上的4.025uVrms。之后还拿4V的锂电池接进去测得噪声为33uVrms,感觉像是噪声随输入直流电平的增大而增大啊,不知道是这个芯片本身的特性就是如此还是使用上出了问题?
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