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本文介绍了逐次比较法A/D变换原理,阐述了用微型计算机实现A/D变换的系统接口及控制的软件程序,并对变换时间精度及其应用价值进行了讨论。试用微型计算机实现A/D变换既经济而又方便可行。实行A/D变换主要有三种方式:并行输出法、逐次比较法、双斜坡法,其中逐次比较法在A/D变换中速度较快,应用面较广,本文主要论述逐次比较法。
In this paper, the principle of successive comparison A / D conversion is introduced. The system interface and the software program for controlling the A / D conversion by using microcomputer are described. The transformation time precision and its application value are also discussed. Try micro-computer to achieve A / D conversion is economical and convenient. There are mainly three ways to implement A / D conversion: parallel output method, successive comparison method and double slope method. Among them, sequential comparison method is faster and more widely used in A / D conversion. This article mainly discusses successive comparison method.