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ADM2485:  2.5 kV Signal Isolated, High Speed (16 Mbps), Half Duplex RS-485 Transceiver w/ Transformer Driver

Product Details

The ADM2485 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/TIA/EIA RS-485-A-98 and ISO 8482:1987(E).

The device employs Analog Devices, Inc., iCoupler ® technology to combine a 3-channel isolator, a three-state differential line driver, and a differential input receiver into a single package. An on-chip oscillator outputs a pair of square waveforms that drive an external transformer to provide isolated power with an external transformer. The logic side of the device can be powered with either a 5 V or a 3.3 V supply, and the bus side is powered with an isolated 5 V supply.

The ADM2485 driver has an active high enable. 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 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.


  • Isolated RS-485/RS-422 interfaces
  • PROFIBUS networks
  • Industrial field networks
  • Multipoint data transmission systems
  • Data Sheet, Rev. A, 12/07


    • Half-duplex, isolated RS-485 transceiver
    • Integrated oscillator driver for external transformer
    • PROFIBUS® compliant
    • Complies with ANSI/TIA/EIA RS-485-A-98 and ISO 8482:1987(E)
    • Data rate: 16 Mbps
    • 5 V or 3.3 V operation (VDD1)
    • High common-mode transient immunity: >25 kV/μs
    • Wide-body, 16-lead SOIC package
    • 50 nodes on bus
    • Isolated DE OUT status output
    • Thermal shutdown protection
    • Safety and regulatory approvals
      UL recognition: 2500 V rms for 1 minute per UL 1577
      VDE Certificate of Conformity
      DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
      Reinforced insulation, VIORM = 560 V peak
    • Operating temperature range: –40°C to +85°C

    Functional Block Diagram for ADM2485

    Enter values and click on PowerMe to find power solutions for this IC. PowerMe launch of ADIsimPower Voltage Regulator Design Tool
    (Nominal) For IC being powered
    Available System Voltage V Operating Voltage Rail V Load Current A


    Title Content Type File Type
    ADM2485: High Speed, Isolated RS-485 Transceiver with Integrated Transformer Driver Data Sheet (Rev A, 12/2007) (pdf, 580 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
    AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices  (pdf, 406 kB) Application Notes PDF
    AN-913: Isolating I2C Interfaces  (pdf, 280 kB) Application Notes PDF
    AN-793: ESD/Latch-Up Considerations with iCoupler® Isolation Products  (pdf, 246 kB) Application Notes PDF
    AN-825: Power Supply Considerations in iCoupler Isolation Products  (pdf, 181 kB) Application Notes PDF
    CN-0031: Half-Duplex, Isolated RS-485 Interface  (pdf, 88 kB) Circuit Note PDF
    Solving Isolation Challenges in Power Conversion Applications
    This webcast will present solutions to isolation challenges in power conversion applications. Among the topics to be discussed are the limitations of traditional methods of isolation (such as utilization of optocouplers and pulse transformers) vs. more efficient and cost effective solutions that utilize digital isolators. If you are currently using optocouplers and pulse transformers, this is a webcast you should attend.
    Webcasts WEBCAST
    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-213: Evaluation Board for the ADM2485 Half-Duplex, Isolated RS-485 Transceiver with Transformer Driver  (pdf, 293 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-2155: Options and Solutions for Partitioning Isolated Power in Isolated RS-485 Nodes  (pdf, 290 kB) Technical Articles PDF
    MS-2127: Designing with iCoupler Digital Isolators in Solar PV Inverters  (pdf, 141 kB) Technical Articles PDF
    Inside iCoupler® Technology:ADuM347x PWM Controller and Transformer Driver with Quad-Channel Isolators Design Summary  (pdf, 291 kB)
    By Flow Zhao, Design Engineer
    Technical Articles PDF
    NAppkin Note: Lowering the Power of the ADuM524x  (pdf, 223 kB)
    By Mark Cantrell, Senior Applications Engineer
    Technical Articles PDF
    Digital Isolator Product Selection and Resource Guide  (pdf, 640 kB) Product Selection Guide PDF
    Analog Devices Achieves Major Milestone by Shipping 1 Billionth Channel of iCoupler Digital Isolation (19 Sep 2013) Press Releases HTML
    Brochure: Motor and Power Control Solutions  (pdf) Overview PDF
    2008 Medical Solution Profile  (pdf, 126 kB)
    High Performance ICs for Medical Imaging, Patient Monitoring, and Instrumentation
    Overview PDF
    Industrial Automation Solutions  (pdf, 6110 kB) Overview PDF
    iCoupler Digital Isolators Qualified for Automotive Applications Overview HTML
    isoPower® - Isolated dc-to-dc Power in the smallest Package Overview HTML
    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
    How do I learn about new iCoupler products? FAQs/RAQs HTML
    Are iCoupler products Pb-free? FAQs/RAQs HTML
    Can I replace an optocoupler with an iCoupler product in an existing design? FAQs/RAQs HTML
    What are some of the distinguishing features of the iCoupler products? FAQs/RAQs HTML
    What communications protocols are supported by iCoupler products? FAQs/RAQs HTML
    What are the different types of iCoupler products? FAQs/RAQs HTML
    Do iCoupler products have VDE certification for reinforced insulation? FAQs/RAQs HTML
    With which regulatory standards do iCoupler products comply? FAQs/RAQs HTML
    How much isolation can iCoupler products provide? FAQs/RAQs HTML
    What are the benefits of iCoupler technology? FAQs/RAQs HTML
    What is iCoupler technology? FAQs/RAQs HTML
    What types of technologies have been used to provide isolation? FAQs/RAQs HTML
    What are optocouplers? What is optical isolation? FAQs/RAQs HTML
    What is capacitive isolation? FAQs/RAQs HTML
    What regulatory standards address isolation products? FAQs/RAQs HTML
    What is isolation? Why is it needed? FAQs/RAQs HTML
    What are common applications that use isolation? FAQs/RAQs HTML
    How is isolation specified? FAQs/RAQs HTML
    What is isolation rating? FAQs/RAQs HTML
    What is the relationship between working voltage and isolation rating? FAQs/RAQs HTML
    What is the difference between basic and double (or reinforced) insulation levels? FAQs/RAQs HTML
    What are transient immunity and common-mode rejection? FAQs/RAQs HTML
    What other parameters are important when considering an isolation device? FAQs/RAQs HTML
    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.

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    Price, packaging, availability

    ADM2485 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    ADM2485BRWZ Status: Production 16 ld SOIC - Wide 16 Ind Tube, 47 $4.83 $4.20 Y  Material Info PCN Purchase Sample
    ADM2485BRWZ-REEL7 Status: Production 16 ld SOIC - Wide 16 Ind Reel, 400 - $4.20 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/
    EZLINX-IIIDE-EBZ Status: Production iCoupler® Isolated Interface Development Environment Evaluation Board $149.00 Yes -
    ADM2485 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    EVAL-ADM2485EB3Z Status: Production Evaluation Board $75.00 Yes -
    EVAL-ADM2485EB5Z 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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