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AD5700 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD5700 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page Low Power HART Modem Data Sheet AD5700/AD5700-1 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,nor for anyinfringements ofpatents orother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. FEATURES 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°C to +125°C operation 4 mm × 4 mm LFCSP package HART physical layer compliant UART interface APPLICATIONS Field transmitters HART multiplexers PLC and DCS analog I/O modules HART network connectivity GENERAL DESCRIPTION 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. 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 AD5421 16-bit, serial input, loop powered, 4 mA to 20 mA DAC AD5410/ AD5420 Single-channel, 12-bit/16-bit, serial input, 4 mA to 20 mA current source DACs AD5412/ AD5422 Single-channel, 12-bit/16-bit, serial input, current source and voltage output DACs FUNCTIONAL BLOCK DIAGRAM Figure 1. OSC XTAL1 REF REF_EN AGND DGND FILTER_SEL CLKOUT REG_CAP VCC RESET CD DUPLEX IOVCC HART_OUT ADC_IP HART_IN RXD TXD RTS CLK_CFG0 CLK_CFG1 XTAL_EN AD5700/AD5700-1 XTAL2 FSK MODULATOR VOLTAGE REFERENCE DAC FSK DEMODULATOR BAND-PASS FILTER AND BIASING ADC BUFFER |
Podobny numer części - AD5700 |
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Podobny opis - AD5700 |
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