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ADIAD5700HART調制解調器評估方案

2012-03-09
作者:ADI公司

ADI公司的AD5700/AD5700-1是HART FSK半雙工調制解調器單片解決方案,和HART物理層的需求兼容,集成了所有需要的濾波,信號調理,調制和解調,信號產生功能,外接元件很少,2V-5.5V電源,接口電平1.71V-5.5V,主要用在場發送器,HART復接器,HART網絡連接,PLCDCS模擬I/O模塊。本文介紹了AD5700主要特性,方框圖,連接圖,回路供電的發送器框圖,HART智能發送器參考電路圖以及AD5700/AD5700-1 HART調制解調器評估板主要特性,電路圖,材料清單和PCB元件布局圖。

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

1200 Hz and 2200 Hz sinusoidal shift frequencies

115 μA maximum supply current in receive mode

Suitable for intrinsically safe applications

Integrated receive band-pass filter

Minimal external components required

Clocking optimized for various system configurations

Ultralow power crystal oscillator (60 μA maximum)

External CMOS clock source

Precision internal oscillator (AD5700-1 only)

Buffered HART output—extra drive capability

8 kV HBM ESD rating

2 V to 5.5 V power supply

1.71 V to 5.5 V interface

−40℃ to +125℃ operation

4 mm × 4 mm LFCSP package

HART physical layer compliant UART interface

AD5700應用:

Field transmitters

HART multiplexers

PLC and DCS analog I/O modules

HART network connectivity

圖1。AD5700方框圖

圖2。AD5700/01外接和內部濾波器選擇的連接圖

圖3。AD5700回路供電的發送器框圖

圖4。AD5700 HART智能發送器參考電路圖

AD5700/AD5700-1 HART調制解調器評估板

This user guide describes the evaluation board for the AD5700/ AD5700-1 Highway Addressable Remote Transducer (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 data sheet available from Analog Devices, Inc., which should be consulted in conjunction with this user guide when using the evaluation board.

HART調制解調器評估板主要特性:

Convenient connections for power through screw

Terminal block

Use of on-chip RC oscillator or an external crystal

Various link options

EQUIPMENT NEEDED

Host controller with UART interface

圖5。HART調制解調器評估板外形圖

圖6。HART調制解調器評估板電路圖
HART調制解調器評估板材料清單(BOM):


圖7。HART調制解調器評估板元件布局圖
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/AD5700_5700-1.pdf

http://www.analog.com/static/imported-files/user_guides/UG-382.pdf



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