ADuC847的一类高精度I/F转换器的设计  

A Class of High-precision I/F Converter Based on ADuC847

作　　者：于镭[1] 王衍平[1] 

机构地区：[1]青岛科技大学自动化与电子工程学院,青岛266042

出　　处：《单片机与嵌入式系统应用》2013年第3期53-55,共3页Microcontrollers & Embedded Systems

摘　　要：设计了基于ADuC847的一类高精度、高输出的I/F转换器。首先,将双极性电流信号转换为双极性差分电压信号;然后ADuC847对该双极性差分电压信号进行A/D采样,通过对采样信号进行数字滤波,获得较稳定的A/D值。接着对零点和满量程进行校正;最后通过数字频率合成算法,由PWM0输出频率信号,而频率的双极性则由74LS00实现。A class of high-precision, high-output I/F converter based on ADuC847 is designed by the paper. Firstly, the converter con- verts the bipolar current signal to the bipolar differential voltage signal, and then it runs A/D sampling for bipolar differential voltage signal, through the digital filter for the sampled signal. It can obtain the stable A/D values. And then it calibrates the zero and full scale, and at last the zero and span are calibrated. Finally through the digital frequency synthesis algorithm, PWM0 outputs frequency signal, while the bipolar frequency is implemented by 74LS00~

关 键 词：I F转换器 ADuC847 数字滑动平均滤波 数字频率合成算法 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构] TN911.7[自动化与计算机技术—计算机科学与技术]