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ADM2483BRW-REEL Folha de dados(PDF) 1 Page - Analog Devices |
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ADM2483BRW-REEL Folha de dados(HTML) 1 Page - Analog Devices |
1 / 20 page Half-Duplex iCoupler ® Isolated RS-485 Transceiver ADM2483 Rev. 0 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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. FEATURES RS-485 transceiver with electrical data isolation Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482:1987(E) 500 kbps data rate Slew rate–limited driver outputs Low power operation: 2.5 mA max Suitable for 5 V or 3 V operation (VDD1) High common-mode transient immunity: >25 kV/μs True fail-safe receiver inputs Glitch-free power-up/-down protection 256 nodes on bus Thermal shutdown protection 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 Rev. 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 APPLICATIONS Low power RS-485/RS-422 networks Isolated interfaces Building control networks Multipoint data transmission systems FUNCTIONAL BLOCK DIAGRAM DE VDD1 GND1 GND2 VDD2 TxD POWER_VALID RxD RE A B ADM2483 Figure 1. GENERAL DESCRIPTION The ADM2483 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on balanced, multipoint bus transmission lines. It complies with ANSI TIA/EIA RS-485-A and ISO 8482:1987(E). Using Analog Devices’ iCoupler ® technology, the ADM2483 combines a 3-channel isolator, a 3-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 3 V supply, while the bus side uses a 5 V supply only. The ADM2483 is slew-limited to reduce reflections with improperly terminated transmission lines. The controlled slew rate limits the data rate to 500 kbps. The device’s input impedance is 96 kΩ, allowing up to 256 transceivers on the bus. Its driver has an active-high enable. The driver differential outputs and receiver differential inputs are connected internally to form a differential I/O port. When the driver is disabled or when VDD1 or VDD2 = 0, this imposes minimal loading on the bus. An active-high receiver disable, which causes the receive output to enter a high impedance state, is provided as well. The receiver inputs have a true fail-safe feature that ensures a logic-high receiver output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and at the point when communication ends. Current limiting and thermal shutdown features protect against output short circuits and bus contention situations that 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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