ADIAD5700HART调制解调器评估方案

1、ADI AD5700 HART调制解调器评估方案关键字：工业控制,HART复接器,HART网络连接,PLC,DCSADI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

2、性，电路图，材料清单和PCB元件布局图。ADIThe 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 s

3、ignal 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

4、115 A, 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 integra

5、ted FSK modem1200 Hz and 2200 Hz sinusoidal shift frequencies115 A maximum supply current in receive modeSuitable for intrinsically safe applicationsIntegrated receive band-pass filterMinimal external components requiredClocking optimized for various system configurationsUltralow power crystal oscil

6、lator (60 A maximum)External CMOS clock sourcePrecision internal oscillator (AD5700-1 only)Buffered HART outputextra drive capability8 kV HBM ESD rating2 V to 5.5 V power supply1.71 V to 5.5 V interface40 to +125 operation4 mm 4 mm LFCSP packageHART physical layer compliant UART interfaceAD5700应用：Fi

7、eld transmittersHART multiplexersPLC and DCS analog I/O modulesHART network connectivity图1。AD5700方框图图2。AD5700/01外接和内部滤波器选择的连接图图3。AD5700回路供电的发送器框图图4。AD5700 HART智能发送器参考电路图AD5700/AD5700-1 HART调制解调器评估板This user guide describes the evaluation board for the AD5700/ AD5700-1 Highway Addressable Remote Tran

8、sducer (HART) modem. This board can be used to evaluate either the AD5700 or the AD5700-1 part. Both can operate from a single 2 V to 5.5 V supply, with the AD5700-1 having the added feature of an integrated oscillator. Complete specifications for both products can be found in the AD5700/AD5700-1 da

9、ta sheet available from Analog Devices, Inc., which should be consulted in conjunction with this user guide when using the evaluation board.HART调制解调器评估板主要特性：Convenient connections for power through screwTerminal blockUse of on-chip RC oscillator or an external crystalVarious link optionsEQUIPMENT NEEDEDHost controller with UART interface图5。