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ADM3251EARWZ-REEL Datenblatt(PDF) 1 Page - Analog Devices |
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ADM3251EARWZ-REEL Datenblatt(HTML) 1 Page - Analog Devices |
1 / 16 page Isolated, Single-Channel RS-232 Line Driver/Receiver ADM3251E Rev. 0 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 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 (pending) UL recognition 2500 V rms for 1 minute per UL 1577 VDE Certificate of Conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 VIORM = 560 V peak 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 *5kΩ 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 integrated dc-to-dc converter. The result is a total isolation solution. 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. |
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