应用Intel8279芯片实现多路D/A转换  

Multi-Channel D/A Conversion with the Intel 8279 Chip

作　　者：张富有[1] 黄辉[1] 陈绿深[1] 刘忠新 

机构地区：[1]北京理工大学自动控制系,北京100081

出　　处：《北京理工大学学报》1993年第3期443-446,共4页Transactions of Beijing Institute of Technology

摘　　要：一种多路D/A转换器,它主要由Intel 8279芯片、一路基本D/A转换电路、一个模拟开关和相应的采样保持器组成,与其它的多路D/A电路相比,其不同之处在于它用8279中的显示RAM和扫描线实现转换数据的存放和对各路D/A的循环扫描,从而减轻了CPU的负担,而且电路简单,成本低.经过研究表明,这种电路不仅能实现8路8位的D/A转换,而且还能实现16路8位和8路16位的多路D/A转换。Introduces a new multi-channel D/A conversion circuit, consisting of an Intel 8279 chip, a basic D/A conversion circuit, an analog-switch and devices for sampling and hold. In comparison with other D/A conversion circuits, it makes use of the display-RAM and scanning rays of the Intel 8279 chip to store the conversion data and to scan through D/A channel one by one, thus the CPU can be freed from heavy burdens. The circuit used is simple and low in its cost. Further, this circuit can not only complete 8 channel, 8 bit D/A conversion, but also 16 channel, 8 bit or 8 channel, 16 bit D/A conversion.

关 键 词：数-模转换器 采样保持电路 芯片 

分 类 号：TP335.4[自动化与计算机技术—计算机系统结构]