基于LabWindows/CVI高速并行数据采集系统USB4814的设计

摘要

基于LabWindows/CVI软件开发平台，利用USB4814数据采集卡设计了高精度并行数据采集系统。该系统的特点是选用高采样率高精度的14位A/D转换芯片进行A/D转换电路设计，并行采集卡每一路都应用独立的A/D转换器。采用同步并行设计，通道间串扰极小，无相位差，具有极高的测量精度和相位一致性。系统运用USB 3.0传输接口技术，发挥了USB 3.0接口的优势，提高了数据传输速度，满足了高数据吞吐量要求。对系统的设计可达到高性价比、多功能、低功耗等特点的数据采集的目的。%A high⁃speed parallel data acquisition system was designed on LabWindows/CVI software development platform by using the USB4814 data acquisition card. As for the characteristic of this system,14⁃bit A/D conversion chip with sampling rate and high accuracy was selected in A/D converter circuit design. An independent A/D converter is used in each channel of the parallel acquisition card. Since the synchronous parallel design is adopted,the crosstalk between the channels is very weak and there is no phase difference. It has a very high accuracy and consistency phase. The system uses USB3.0 transmission inter⁃face technology,and takes advantage of USB3.0 interface. It improved data transfer speed,and met the high data throughput re⁃quirement. The design of this system has characteristics of high performance⁃price ratio,multi⁃function and low⁃power consumption.