本文介绍一种基于AD1674设计的接口电路,该电路具有查询、中断和DMA三种数据传输功能,同时采用8253定时脉冲或端口写两种A/D启动方式。其中DMA方式实现了数据的快速传输,而两种A/D启动方式将会使采样率的设定更加灵活。应用本文原理设计的可插入通用PC机的数据采集板已用于我们的高频多谱勒和到达角探测分析系统中,取得了满意的效果。这些设计方法和原理在其它实际数据采集系统的设计过程中,也会具有重要的参考价值。

-This paper describes a design based on the AD1674 interface circuit, the circuit has a query, three types of interrupt and DMA data transfer function, while by 8253 the port was timed pulse or two A/D start mode. In which DMA was achieved by the rapid transmission of data, while the two A/D start mode will set the sample rate more flexible. Application of this principle of universal design can be inserted into PC-data acquisition board has been used in our high-frequency Doppler, and angle of arrival detection analysis system with satisfactory results. These design methods and principles in other practical data acquisition system design process, will be an important reference value.