MAX7491芯片及其在信号采集系统中的应用  

MAX7491 and its applications in signal acquisition system

作　　者：陈红钊 方前程 

机构地区：[1]湖南省煤炭科学研究院,湖南长沙410004

出　　处：《电子设计工程》2015年第11期125-127,共3页Electronic Design Engineering

基　　金：湖南省科技厅资助项目(2012SK2011)

摘　　要：MAX7491是一款新型的开关电容滤波器芯片,基于对其进行更有效的应用,文中首先介绍了该芯片的结构、特点、工作原理及其常用场合;在此基础上,依据技术手册和应用环境,用MAX7491设计了四阶带通滤波器和四阶带阻滤波器,并将该设计应用到地下磁流体探测仪的信号采集系统,用于前置滤波处理;在仪器完成实地数据采集后,用labview对所测数据进行分析并对滤波效果进行评价;通过将滤波前后的信号频谱进行对比,可以看出应用MAX7491取得了较好的滤波效果。MAX7491 is kind of switched-capacitor filter.In order to make an effective application of this integrated circuit,it introduced the internal strncture,the features,the working principle and the applications of MAX7491 firstly. Then Designed a kind of 4-order bandpass filter and a kind of 4-order notch filter using the MAX7491 according to the datasheetand then Took these filters used in processing the front-end signal in the signal acquisition system of the underground magneto fluid detector.After sampling a certain amount of data using the device,it used labview to analyze and estimate the result. Comparing the frequency spectrum of the signal between the before and after filtering, it found out that the result is good with using the MAX7491.

关 键 词：MAX7491 开关电容滤波器 带通滤波 带阻滤波 地下磁流体探测仪 信号采集系统 

分 类 号：TN409[电子电信—微电子学与固体电子学]