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ADI AD5700 HART调制解调器评估方案

关键词:工业控制 HART复接器 HART网络连接 PLC DCS

时间:2012-03-08 10:48:56       作者:ADI       来源:AD5700

ADI公司的AD5700/AD5700-1是HART FSK半双工调制解调器单片解决方案,和HART物理层的需求兼容,集成了所有需要的滤波,信号调理,调制和解调,信号产生功能,外接元件很少,2V-5.5V电源,接口电平1.71V-5.5V,主要用在场发送器,HART复接器,HART网络连接,PLC和DCS模拟I/O模块。本文介绍了AD5700主要特性,方框图,连接图,回路供电的发送器框图,HART智能发送器参考电路图以及AD5700/AD5700-1 HART调制解调器评估板主要特性,电路图,材料清单和PCB元件布局图。

The AD5700/AD5700-1 are single-chip solutions, designed and specified to operate as a HART® FSK half-duplex modem, complying with the HART physical layer requirements. The AD5700/AD5700-1 integrate all of the necessary filtering, signal detection, modulating, demodulating and signal generation functions, thus requiring few external components. The 0.5% precision internal oscillator on the AD5700-1 greatly reduces the board space requirements, making it ideal for line-powered applications in both master and slave configurations. The maxi- mum supply current consumption is 115 μA, making the AD5700/ AD5700-1 an optimal choice for low power loop-powered applications. Transmit waveforms are phase continuous 1200 Hz and 2200 Hz sinusoids. The AD5700/AD5700-1 contain accurate carrier detect circuitry and use a standard UART interface.

AD5700主要特性:

HART-compliant fully integrated FSK modem
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