The ADM3485E is a 3.3 V, low power data transceiver with ±15 kV ESD protection, suitable for half-duplex communication on multipoint bus transmission lines. The ADM3485E is designed for balanced data transmission and complies with TIA/EIA standards RS485 and RS-422. The ADM3485E is a half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and the receiver.
The devices have a 12 kΩ receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus.
The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit.
The part is fully specified over the industrial temperature range and is available in an 8-lead narrow SOIC package.APPLICATIONS
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|ADM3485E: 15 kV ESD-Protected, 3.3 V,12 Mbps, EIA RS-485/RS-422 Transceiver Data Sheet (Rev D, 08/2010) (pdf, 445 kB)||Data Sheets|
|AN-1161: EMC-Compliant RS-485 Communication Networks (pdf, 226 kB)||Application Notes|
|AN-960: RS-485/RS-422 Circuit Implementation Guide (pdf, 245 kB)||Application Notes|
Solving Isolation Challenges in Industrial Automation
This webcast will discuss the role isolation plays in providing protection and reducing the system bit-error-rate, using the specific design challenges of an RS-485 network. Topics to be covered in this presentation will include: Why and when one should isolate, Types of isolation and their advantages, Design Considerations for an RS-485 node (and how this translates to design considerations for signal isolation) as well as many other topics.
EMC, CE Mark, IEC801... What's it all about?
... New devices to ease the job.
(Analog Dialogue, Vol. 30, No. 4)
|Safeguard Your RS485 Communication Networks from Harmful EMC Events (pdf, 347 kB)||Technical Articles|
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|Brochure: Motor and Power Control Solutions (pdf)||Overview|
|Industrial Automation Solutions (pdf, 6110 kB)||Overview|
|Emerging Energy Applications Solutions Bulletin, Volume 10, Issue 4 (pdf, 1496 kB)||Solutions Bulletins|
|Test & Instrumentation Solutions Bulletin, Volume 10, Issue 3 (pdf, 1334 kB)||Solutions Bulletins|
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|Glossary of EE Terms||Glossary||HTML|
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|ADM3485E IBIS Model||IBIS Models||HTML|
Evaluation board for evaluating the RS485
The ezLINX™ iCoupler® Isolated Interface Development Environment provides developers with a cost-effective, plug and play method for evaluation eight physical layer, digitally-isolated communication standards.
Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.