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ADM4851:  5 V, ⅛ Load, Slew-Rate Limited, RS-485/RS-422 Transceiver (Half Duplex, 500 kbps)

Product Details


The ADM4850-ADM4857 are differential line transceivers suitable for high speed full and half duplex data communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with EIA Standards RS-485 and RS-422. The ADM4850-ADM4853 are half duplex transceivers which share differential lines and have separate enable inputs for the driver and receiver. The full duplex ADM4854-ADM4857 transceivers have dedicated differential line driver outputs and receiver inputs.

The devices have a 1/8-unit-load receiver input impedance which allows up to 256 transceivers on a bus. Since only one driver should be enabled at any time, the output of a disabled or powered down driver is three-stated to avoid overloading the bus.

The receiver inputs have a true failsafe feature which ensures a logic high output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state before communication begins and when communication ceases.

The driver outputs are slew rate limited in order to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit.

The parts are fully specified over the commercial and industrial temperature ranges and are available in 8-lead SOIC, LFCSP (ADM4850/ADM4851/ADM4852/ADM4853), and MSOP (ADM4850 only) packages.


Applications
  • Low power RS-485 applications
  • EMI-sensitive systems
  • DTE-DCE interfaces
  • Industrial control
  • Packet switching
  • Local area networks
  • Level translators
  • FEATURES and BENEFITS

    • EIA RS-485/RS-422 Compliant
    • Data rate options:
      ADM4851/ ADM4855: 500 kbps
    • Half- and full-duplex options
    • Reduced slew rates for low EMI
    • True fail-safe receiver inputs
    • 5 μA (maximum) supply current in shutdown mode
    • Up to 256 transceivers on one bus
    • Outputs high-Z when disabled or powered off
    • −7 V to +12 V bus common-mode range
    • Thermal shutdown and short-circuit protection
    • See data sheet for additional features

    Functional Block Diagram for ADM4851

    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

    Documentation

    Title Content Type File Type
    ADM4850-ADM4857: 5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers Data Sheet (Rev D, 01/2012) (pdf, 453 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
    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

    ADM4851 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    ADM4851ACP-REEL7 Status: Obsolete 8 ld LFCSP (3x3mm) 8 Ind Reel, 1500 - - N  Material Info PDN Contact ADI
    ADM4851AR Status: Obsolete 8 ld SOIC 8 Ind Tube, 98 - - N  Material Info PDN Contact ADI
    ADM4851AR-REEL7 Status: Obsolete 8 ld SOIC 8 Ind Reel, 1000 - - N  Material Info PDN Contact ADI
    ADM4851ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $0.81 $0.71 Y  Material Info Notify Me Purchase Sample
    ADM4851ARZ-REEL7 Status: Production 8 ld SOIC 8 Ind Reel, 1000 - $0.71 Y  Material Info Notify Me 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.

    Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-RS485HDEBZ Status: Production Standard Half-Duplex RS-485 Evaluation Board $30.00 Yes -
    ADM1485ARZ Status: Production 5V, 30 Mbps, 32 nodes, -40C to +85C $3.10 Yes -
    ADM1485JRZ Status: Production 5V, 30 Mbps, 32 nodes, 0C to +70C $2.33 Yes -
    ADM1486AR Status: Production 5V, 30 Mbps, 50 nodes, Profibus-compliant, -40C to +85C, Not ROHS Compliant $3.03 No -
    ADM1486ARZ Status: Production 5V, 30 Mbps, 50 nodes, Profibus-compliant, -40C to +85C $2.63 Yes -
    ADM1487EARZ Status: Production 5V, Enhanced ESD, 2.5 Mbps, 128 nodes, -40C to +85C $1.59 Yes -
    ADM3072EARZ Status: Production 3.3V, Enhanced ESD, 250 kbps, 256 nodes, -40C to +85C $1.84 Yes -
    ADM3072EYRZ Status: Production 3.3V, Enhanced ESD, 250 kbps, 256 nodes, -40C to +125C $2.02 Yes -
    ADM3075EARZ Status: Production 3.3V, Enhanced ESD, 500 kbps, 256 nodes, -40C to +85C $1.84 Yes -
    ADM3075EWYRZ Status: Production 3.3V, Enhanced ESD, 500 kbps, 256 nodes, -40C to +125C, Automotive - Yes -
    ADM3075EYRZ Status: Production 3.3V, Enhanced ESD, 500 kbps, 256 nodes, -40C to +125C $2.02 Yes -
    ADM3078EARZ Status: Production 3.3V, Enhanced ESD, 16 Mbps, 256 nodes, -40C to +85C $1.87 Yes -
    ADM3078EYRZ Status: Production 3.3V, Enhanced ESD, 16 Mbps, 256 nodes, -40C to +125C $2.05 Yes -
    ADM3483ARZ Status: Production 3.3V, 250 kbps, 32 nodes, -40C to +85C $1.21 Yes -
    ADM3483EARZ Status: Production 3.3V, Enhanced ESD, 250 kbps, 32 nodes, -40C to +85C $1.59 Yes -
    ADM3485ARZ Status: Production 3.3V, 10 Mbps, 32 nodes, -40C to +85C $1.42 Yes -
    ADM3485EAR Status: Production 3.3V, Enhanced ESD, 12 Mbps, 32 nodes, -40C to +85C, Not ROHS Compliant $3.51 No -
    ADM3485EARZ Status: Production 3.3V, Enhanced ESD, 12 Mbps, 32 nodes, -40C to +85C $3.04 Yes -
    ADM3486EARZ Status: Production 3.3V, Enhanced ESD, 2.5 Mbps, 32 nodes, -40C to +85C $1.59 Yes -
    ADM3493ARZ Status: Production 3.3V, 250 kbps, 256 nodes, -40C to +85C $1.32 Yes -
    ADM483ARZ Status: Production 5V, 250 kbps, 32 nodes, -40C to +85C $0.76 Yes -
    ADM483EARZ Status: Production 5V, Enhanced ESD, 250 kbps, 32 nodes, -40C to +85C $1.68 Yes -
    ADM4850ARZ Status: Production 5V, 115 kbps, 256 nodes, -40 to +85C $0.91 Yes -
    ADM4851ARZ Status: Production 5V, 500 kbps, 256 nodes, -40 to +85C $0.91 Yes -
    ADM4852ARZ Status: Production 5V, 2.5 Mbps, 256 nodes, -40 to +85C $0.91 Yes -
    ADM4853ARZ Status: Production 5V, 10 Mbps, 256 nodes, -40 to +85C $0.91 Yes -
    ADM4853WARZ-RL7 Status: Production 5V, 10 Mbps, 256 nodes, -40 to +85C, Automotive - Yes -
    ADM485AR Status: Production 5V, 5 Mbps, 32 nodes, -40 to +85C, Not ROHS Compliant $2.85 No -
    ADM485ARZ Status: Production 5V, 5 Mbps, 32 nodes, -40 to +85C $2.47 Yes -
    ADM485EARZ Status: Production 5V, Enhanced ESD, 2.5 Mbps, 32 nodes, -40 to +85C $1.59 Yes -
    ADM485JRZ Status: Production 5V, 5 Mbps, 32 nodes, 0 to +70C $1.86 Yes -
    ADM487EARZ Status: Production 5V, Enhanced ESD, 2.5 Mbps, 32 nodes, -40 to +85C $1.59 Yes -
    ADM487EWARZ Status: Production 5V, Enhanced ESD, 2.5 Mbps, 32 nodes, -40 to +85C, Automotive $3.18 Yes -
    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 -

    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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