论文主要介绍了在单片机的应用系统中,被测量对象的有关变量,如温度、压力、流量、速度等非电物理量,须经传感器转换成连续变化的模拟电信号,这些模拟电信号必须转换成数字量后才能在单片机中用软件进行处理。实现模拟量转换成数字量的器件称为A/D转换器。A/D转化技术在如今科技系统迅猛发达的时代中,起到了中流砥柱的作用。这种技术为现代化社会电子产品的诞生奠定了重要的基础。 In the application system of singlechip, the relevant variables of the object to be measured, such as temperature, pressure, flow, speed and other non-electro-physical quantities, must be converted into continuous changing analog electrical signals by sensors. These analog electrical signals must be converted into After the amount of digital microcontroller software can be used to deal with. The realization of analog to digital conversion device called A / D converter. A / D conversion technology in today’s rapid development of science and technology in the era, played the role of the mainstay. This technology has laid an important foundation for the birth of modern social electronic products.