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ADM2481:  2.5 kV Signal Isolated, 500 kbps, Half Duplex RS-485 Transceiver

Product Details

Product Status:Recommended for New Designs

The ADM2481 differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on balanced, multipoint bus transmission lines. It complies with ANSI EIA/TIA-485-A and ISO 8482: 1987(E). Using iCoupler® technology from Analog Devices, Inc., the ADM2481 combines 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 3 V supply, and the bus side uses a 5 V supply only.

The ADM2481 is slew-limited to reduce reflections with improperly terminated transmission lines. The controlled slew rate limits the data rate to 500 kbps. The input impedance of the device is 96 kΩ, allowing up to 256 transceivers on the bus. Its driver has an active-high enable feature. 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 V, this imposes minimal loading on the bus. An active-high receiver disable feature, which causes the receiver 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 of −40°C to +85°C and is available in a 16-lead, wide body SOIC package.

Applications
  • Low power RS-485/RS-422 networks
  • Isolated interfaces
  • Building control networks
  • Multipoint data transmission systems
  • FEATURES and BENEFITS

    • RS-485 transceiver with electrical data isolation
    • Complies with ANSI TIA/EIA-485-A and ISO 8482: 1987(E)
    • 500 kbps data rate
    • Slew rate-limited driver outputs
    • Low power operation: 2.5 mA maximum
    • Suitable for 5 V or 3.3 V operations (VDD1)
    • High common-mode transient immunity: >25 kV/μs
    • See data sheet for additional features

    Functional Block Diagram for ADM2481

    Documentation

    Title Content Type File Type
    ADM2481: Half-Duplex, iCouplerIsolated RS-485 Transceiver (Rev A, 06/2012) (pdf, 275 kB) Data Sheets PDF
    AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format  (pdf, 671 kB) Application Notes PDF
    AN-960: RS-485/RS-422 Circuit Implementation Guide  (pdf, 245 kB) Application Notes PDF
    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.
    Webcasts WEBCAST
    UG-316: Evaluation Board for the ADM2481 2.5 kV Signal Isolated, 500 kbps, Half-Duplex RS-485 Transceiver  (pdf, 358 kB) User Guides PDF
    High-Performance Multichannel Power-Line Monitoring with Simultaneous-Sampling ADCs
    By Colm Slattery, Analog Devices, Inc. (Analog Dialogue, Vol. 41, January 2007)
    Analog Dialogue HTML
    MS-2127: Designing with iCoupler Digital Isolators in Solar PV Inverters  (pdf, 141 kB) Technical Articles PDF
    Brochure: Motor and Power Control Solutions  (pdf) Overview PDF
    Industrial Automation Solutions  (pdf, 6110 kB) Overview PDF
    Emerging Energy Applications Solutions Bulletin, Volume 10, Issue 4  (pdf, 1496 kB) Solutions Bulletins PDF
    Test & Instrumentation Solutions Bulletin, Volume 10, Issue 3  (pdf, 1334 kB) Solutions Bulletins PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    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.

    SampleSample & Buy

    Price, packaging, availability

    ADM2481 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    ADM2481BRWZ Status: Production 18 ld SOIC - Wide 16 Ind Tube, 47 $3.34 $3.04 Y  Material Info PCN Purchase Sample
    ADM2481BRWZ-RL7 Status: Production 18 ld SOIC - Wide 16 Ind Reel, 400 $3.34 $3.04 Y  Material Info PCN Purchase
    Price Table Help

    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.

    ezLINX™ iCoupler® Isolated Interface Development Environment
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EZLINX-IIIDE-EBZ Status: Production iCoupler® Isolated Interface Development Environment Evaluation Board $149.00 Yes -
    ADM2481 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-ADM2481EBZ Status: Production Evaluation Board $75.00 Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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