摘要
文中主要介绍了高性能数模转换器AD421的工作原理及其在智能变送器的设计中的应用。设计方案利用低功耗的16位单片机MSP430作为核心控制器，选用低功耗的外围扩展元器件，设计了具有4-20mA两线制电流输出和RS-232串口数字信号输出，以及带有校准和参数设置功能的智能变送器。经实践证明，具有低功耗、高精度以及工作稳定可靠等特点。
The priniciple of high precision digital to analog converter AD421 and its application in the design of the smart transmitter were introduced in the article. The design scheme uses ultralow-power 16 bit single-chip MPS430 as the central controller and chooses the other ultralow-power external chips, which has designed the smart transmitter which include the 4 - 20 mA two-wire current output, RS - 232 digital output and the function of calibration and the parameters＇ settings. The application shows that it has some traits such as ultralowpower, high precision and working stability.
出处
《仪表技术与传感器》
CSCD
北大核心
2006年第3期49-51,共3页
Instrument Technique and Sensor
