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就是对各种常用的电平的电压参数，波形等进行介绍的，麻烦发个链接吧
这篇应用手册是针对不同电平之间是如何连接的，个人认为非常好的一篇应用手册，推荐给您，希望对您有所帮助：
http://www.ti.com/lit/an/slla120/slla120.pdf
