论文部分内容阅读
ADC0809是8位逐次逼近型模/数转换器集成电路芯片,由于它具有转换速度快,价格低廉及与微型计算机接口简便等一系列优点,在微型机控制的生产过程参数检测和实时控制系统中得到广泛应用。但该器件是按对单(正)极性模似量进行转换设计制造的,不能直接对双(正、负)极性模拟电压进行转换。为此,本文介绍两种将该器件应用于双极性数据转换的方法。一、用偏移二进制码法进行双极性数据转换应用这种方法的原理接线如图1所示。在ADC之前,采用了两级运放,第一级运
ADC0809 is an 8-bit successive approximation analog-digital converter integrated circuit chip, due to its conversion speed, low cost and easy interface with the microcomputer and a series of advantages in the production process of microcomputer-controlled parameter detection and real-time control system Be widely used. However, the device is based on the single (positive) polarity of the analog design and manufacture of conversion, not directly on the double (positive and negative) polarity analog voltage conversion. For this reason, this article describes two ways to apply the device to bipolar data conversion. First, the use of offset binary code bipolar data conversion The principle of application of this method of wiring shown in Figure 1. Before the ADC, using two op amps, the first level of transport