The labels "analog ground" and "digital ground" on these pins refer to the parts of the converter to which the pins are connected, and not to the system grounds to which they must go.
引脚标记说明该引脚已连接到芯片内部的哪个部分，并非要把该引脚连接到电路的哪个参考点。
Three dimensional ground model and three dimensional road model are established on the basis of digital to analog.
以数模为基础建立三维地面模型和三维道路模型。
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