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ADM2486BRWZ Datasheet(PDF) 1 Page - Analog Devices |
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ADM2486BRWZ Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page High Speed, Half-Duplex iCoupler® Isolated RS-485 Transceiver ADM2486 Rev. C 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 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. FEATURES Half-duplex, isolated RS-485 transceiver PROFIBUS®-compliant ANSI EIA/TIA 485-A and ISO 8482: 1987(E) compliant 20 Mbps data rate 5 V or 3 V operation (VDD1) High common-mode transient immunity: >25 kV/μs Isolated DE status output Receiver open-circuit, fail-safe design Thermal shutdown protection 50 nodes on bus Safety and regulatory approvals UL recognition—2500 Vrms for 1 minute per UL 1577 CSA Component Acceptance Notice #5A VDE Certificate of Conformity DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01 DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000 VIORM = 560 V peak Operating temperature range: −40°C to +85°C Wide body, 16-lead SOIC package APPLICATIONS Isolated RS-485/RS-422 interfaces PROFIBUS networks Industrial field networks Multipoint data transmission systems GENERAL DESCRIPTION The ADM2486 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines. It is designed for balanced transmission lines and complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E). FUNCTIONAL BLOCK DIAGRAM RTS VDD1 DE GND1 A B VDD2 GND2 TxD RxD RE PV ADM2486 Figure 1. The device employs Analog Devices’ iCoupler technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. The logic side of the device is powered with either a 5 V or a 3 V supply, and the bus side uses an isolated 5 V supply. The ADM2486 driver has an active-high enable feature. The driver differential outputs and the receiver differential inputs are connected internally to form a differential input/output port that imposes minimal loading on the bus when the driver is disabled or when VDD1 or VDD2 = 0 V. Also provided is an active- high receiver disable feature that causes the receive output to enter a high impedance state. The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention might cause excessive power dissipation. The part is fully specified over the industrial temperature range and is available in a 16-lead, wide body SOIC package. |
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