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AD5700_13

更新时间： 2024-11-05 12:29:07
品牌 Logo 应用领域
亚德诺 - ADI 调制解调器
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24页 564K
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Low Power HART Modem

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AD5700_13 数据手册

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Low Power HART Modem  
AD5700/AD5700-1  
Data Sheet  
FEATURES  
GENERAL DESCRIPTION  
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  
1.71 V to 5.5 V power supply  
1.71 V to 5.5 V interface  
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 applica-  
tions. 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.  
−40°C to +125°C operation  
4 mm × 4 mm LFCSP package  
HART physical layer compliant  
UART interface  
Table 1. Related Products  
Part No.  
Description  
AD5755-1  
Quad-channel, 16-bit, serial input, 4 mA to 20 mA and  
voltage output DAC, dynamic power control, HART  
connectivity  
APPLICATIONS  
Field transmitters  
AD5421  
16-bit, serial input, loop powered, 4 mA to 20 mA DAC  
AD5410/  
AD5420  
AD5412/  
AD5422  
Single-channel, 12-bit/16-bit, serial input, 4 mA to 20 mA  
current source DACs  
Single-channel, 12-bit/16-bit, serial input, current  
source and voltage output DACs  
HART multiplexers  
PLC and DCS analog I/O modules  
HART network connectivity  
FUNCTIONAL BLOCK DIAGRAM  
CLKOUT XTAL1 XTAL2 XTAL_EN  
V
REG_CAP  
CC  
IOV  
CC  
OSC  
AD5700/AD5700-1  
DUPLEX  
CD  
BUFFER  
FSK  
DAC  
HART_OUT  
MODULATOR  
RXD  
TXD  
RTS  
ADC_IP  
BAND-PASS  
FILTER AND  
BIASING  
FSK  
DEMODULATOR  
ADC  
HART_IN  
CLK_CFG0  
CLK_CFG1  
VOLTAGE  
REFERENCE  
RESET  
DGND  
REF REF_EN  
AGND  
FILTER_SEL  
Figure 1.  
Rev. D  
Document Feedback  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2012–2013 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
 
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