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.
出处
《北京理工大学学报》
EI
CAS
CSCD
1993年第3期443-446,共4页
Transactions of Beijing Institute of Technology
关键词
数-模转换器
采样保持电路
芯片
D/A converters
sampling hold circuits/Intel 8279 chip
circulating scan
