这是一款在数模转换的时候会用到的一款四独立的模拟开关的技术手册，尤其是在做电子大赛不让用D/A转换芯片的时候可以派上用场-This is a digital-analog conversion at the time will be used in a four independent analog switches of the technical manuals, especially in the electronic competition not to use D/A converte