High Speed, ESD-Protected, Full-Duplex, iCoupler Isolated RS-485 Transceiver ADM2490E FEATURES FUNCTIONAL BLOCK DIAGRAM V V DD2 DD1 Isolated, full-duplex RS-485/RS-422 transceiver 8 kV ESD protection on RS-485 input/output pins ADM2490E 16 Mbps data rate Complies with ANSI TIA/EIA-485-A-1998 and Y ISO 8482: 1987(E) TxD Z Suitable for 5 V or 3 V operation (V ) DD1 High common-mode transient immunity: >25 kV/s Receiver has open-circuit, fail-safe design A 32 nodes on the bus RxD B Thermal shutdown protection Safety and regulatory approvals UL recognition: 5000 V rms isolation voltage GND GND 1 2 for 1 minute per UL 1577 Figure 1. VDE certificate of conformity DIN EN 60747-5-2 (VDE 0884-10 Part 2): 2003-01 DIN EN 60950 (VDE 0805): 2001-12 EN 60950: 2000 V = 848 V peak IORM Operating temperature range: 40C to +105C Wide body, 16-lead SOIC package APPLICATIONS Isolated RS-485/RS-422 interfaces Industrial field networks INTERBUS Multipoint data transmission systems GENERAL DESCRIPTION The ADM2490E is an isolated data transceiver with 8 kV ESD using the human body model (HBM). The logic side of the device protection that is suitable for high speed, full-duplex communi- can be powered with either a 5 V or a 3 V supply, whereas the cation on multipoint transmission lines. It is designed for balanced bus side requires an isolated 5 V supply. transmission lines and complies with ANSI TIA/EIA-485-A-1998 The device has current-limiting and thermal shutdown features and ISO 8482: 1987(E). The device employs Analog Devices, Inc., to protect against output short circuits and situations where bus iCoupler technology to combine a 2-channel isolator, a three- contention could cause excessive power dissipation. state differential line driver, and a differential input receiver into The ADM2490E is available in a wide body, 16-lead SOIC package a single package. and operates over the 40C to +105C temperature range. The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to 8 kV Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20062008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. GALVANIC ISOLATION 05889-001ADM2490E TABLE OF CONTENTS Features .............................................................................................. 1 Switching Characteristics .................................................................9 Applications ....................................................................................... 1 Typical Performance Characteristics ........................................... 10 Functional Block Diagram .............................................................. 1 Circuit Description......................................................................... 12 General Description ......................................................................... 1 Electrical Isolation ...................................................................... 12 Revision History ............................................................................... 2 Truth Tables................................................................................. 12 Specif icat ions ..................................................................................... 3 Thermal Shutdown .................................................................... 13 Timing Specifications .................................................................. 4 Fail-Safe Receiver Inputs ........................................................... 13 Package Characteristics ............................................................... 4 Magnetic Field Immunity .......................................................... 13 Regulatory Information ............................................................... 5 Applications Information .............................................................. 14 Insulation and Safety-Related Specifications ............................ 5 Isolated Power Supply Circuit .................................................. 14 VDE 0884-10 Insulation Characteristics ................................... 5 PCB Layout ................................................................................. 14 Absolute Maximum Ratings ............................................................ 6 Typical Applications ................................................................... 15 ESD Caution .................................................................................. 6 Outline Dimensions ....................................................................... 16 Pin Configuration and Function Descriptions ............................. 7 Ordering Guide .......................................................................... 16 Test Circuits ....................................................................................... 8 REVISION HISTORY 8/08Rev. 0 to Rev. A Changes to Regulatory Approval Status Throughout .................. 1 Changed VDE 0884 to VDE 0884-10 Throughout ...................... 1 Changes to Table 5 ............................................................................ 5 Changes to Table 8 ............................................................................ 6 Changes to Figure 9 .......................................................................... 9 Changes to iCoupler Technology Section ................................... 12 Changes to Magnetic Field Immunity Section ........................... 13 Changes to Isolated Power Supply Circuit Section .................... 14 Changes to Figure 25 ...................................................................... 14 Added Typical Applications Section ............................................ 15 Updated Outline Dimensions ....................................................... 16 Changes to Ordering Guide .......................................................... 16 10/06Revision 0: Initial Version Rev. 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