文章介紹了基于USB接口芯片的數(shù)據(jù)采集和控制卡的設(shè)計(jì)，整個(gè)系統(tǒng)主要由六個(gè)部分組成：USB接口芯片、本地端控制器、A/D、D/A、計(jì)數(shù)器以及DIO口，通過主機(jī)應(yīng)用軟件來控制USB口的讀寫、數(shù)據(jù)采集、D/A控制以及數(shù)據(jù)傳輸。文中詳細(xì)介紹了USB接口芯片CH371的工作原理及應(yīng)用、數(shù)據(jù)采集器件ADS7825的工作原理及應(yīng)用和DAC器件LTC1450的應(yīng)用等，并利用MFC進(jìn)行主機(jī)應(yīng)用軟件的設(shè)計(jì)。
關(guān)鍵字：USB接口芯片；數(shù)據(jù)采集；CH371；ADS7825；LTC1450
Abstract：The paper introduces a design of data acquisition and control card based on USB interface. The entire system is mostly composed of six parts: USB interface chip ，MCU，A/D，D/A，counter and DIO. The host computer can control the read or write of the USB interface，data acquisition， D/A and data transmission, et al. In this paper, the principle and application of USB interface chip CH371， ADS7825 and LTC1450 are presented in detail. The host computer software is designed in MFC.
Keywords：USB；data acquisition；CH371；ADS7825；LTC1450