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ADM3251E 数据表(PDF) 1 Page - Analog Devices |
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ADM3251E 数据表(HTML) 1 Page - Analog Devices |
1 / 16 page Isolated, Single-Channel RS-232 Line Driver/Receiver ADM3251E Rev. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother 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 ©2008–2010 Analog Devices, Inc. All rights reserved. FEATURES 2.5 kV fully isolated (power and data) RS-232 transceiver isoPower integrated, isolated dc-to-dc converter 460 kbps data rate 1 Tx and 1 Rx Meets EIA/TIA-232E specifications ESD protection on RIN and TOUT pins ±8 kV: contact discharge ±15 kV: air gap discharge 0.1 μF charge pump capacitors High common-mode transient immunity: >25 kV/μs Safety and regulatory approvals UL recognition 2500 V rms for 1 minute per UL 1577 VDE Certificate of Conformity DIN EN 60747-5-2 (VDE 0884 Teil 2): 2003-01 CSA Component Acceptance Notice #5A Operating temperature range: −40°C to +85°C Wide body, 20-lead SOIC package APPLICATIONS High noise data communications Industrial communications General-purpose RS-232 data links Industrial/telecommunications diagnostic ports Medical equipment FUNCTIONAL BLOCK DIAGRAM DECODE RECT REG V– C4 0.1µF 16V VOLTAGE DOUBLER C1+ C1– V+ VISO C2+ C2– R T VOLTAGE INVERTER VCC ROUT TIN GND GNDISO RIN* TOUT ADM3251E OSC ENCODE ENCODE DECODE *INTERNAL 5k Ω PULL-DOWN RESISTOR ON THE RS-232 INPUT. 0.1µF C3 0.1µF 10V C2 0.1µF 16V 0.1µF C1 0.1µF 16V Figure 1. GENERAL DESCRIPTION The ADM3251E is a high speed, 2.5 kV fully isolated, single- channel RS-232/V.28 transceiver device that operates from a single 5 V power supply. Due to the high ESD protection on the RIN and TOUT pins, the device is ideally suited for operation in electrically harsh environments or where RS-232 cables are frequently being plugged and unplugged. The ADM3251E incorporates dual-channel digital isolators with isoPower™ integrated, isolated power. There is no requirement to use a separate isolated dc-to-dc converter. Chip-scale trans- former iCoupler® technology from Analog Devices, Inc., is used both for the isolation of the logic signals as well as for the inte- grated dc-to-dc converter. The result is a total isolation solution. The ADM3251E contains isoPower technology that uses high frequency switching elements to transfer power through the transformer. Special care must be taken during printed circuit board (PCB) layout to meet emissions standards. Refer to Application Note AN-0971, Control of Radiated Emissions with isoPower Devices, for details on board layout considerations. The ADM3251E conforms to the EIA/TIA-232E and ITU-T V. 28 specifications and operates at data rates up to 460 kbps. Four external 0.1 μF charge pump capacitors are used for the voltage doubler/inverter, permitting operation from a single 5 V supply. The ADM3251E is available in a 20-lead, wide body SOIC package and is specified over the −40°C to +85°C temperature range. |
类似零件编号 - ADM3251E |
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类似说明 - ADM3251E |
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