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ADM485:  5 V, Low Power, 5 Mbps, Half Duplex EIA RS-485 Transceiver

Product Details


The ADM485 is a differential line transceiver suitable for high speed bidirectional data communication on multipoint bus transmission lines. It is designed for balanced data transmission and complies with both EIA Standards RS-485 and RS-422. The part contains a differential line driver and a differential line receiver. Both the driver and the receiver may be enabled independently. When disabled, the outputs are tristated.

The ADM485 operates from a single +5 V power supply. Excessive power dissipation caused by bus contention or by output shorting is prevented by a thermal shutdown circuit. This feature forces the driver output into a high impedance state if during fault conditions a significant temperature increase is detected in the internal driver circuitry.

Up to 32 transceivers may be connected simultaneously on a bus, but only one driver should be enabled at any time. It is important, therefore, that the remaining disabled drivers do not load the bus. To ensure this, the ADM485 driver features high output impedance when disabled and also when powered down.

This minimizes the loading effect when the transceiver is not being utilized. The high impedance driver output is maintained over the entire common-mode voltage range form -7V to +12 V.

The receiver contains a fail safe feature which results in a logic high output state if the inputs are unconnected (floating).

The ADM485 is fabricated on BiCMOS, an advanced mixed technology process combining low power CMOS with fast switching bipolar technology. All inputs and outputs contain protection against EDS; all diver outputs feature high source and sink current capability. An epitaxial layer is used to guard against latch-up.

The ADM485 features extremely fast switching speeds. Minimal driver propagation delays permit transmission at data rates up to 5 Mbits/s while low skew minimizes EMI interference.

The part is fully specified over the commercial and industrial temperature range and is available in an 8-pin DIL/SOIC packages.

FEATURES and BENEFITS

  • Meets EIA RS-485 Standard
  • 5 Mbps Data Rate
  • Single 5 V Supply
  • –7 V to +12 V Bus Common-Mode Range
  • High Speed, Low Power BiCMOS
  • Thermal Shutdown Protection
  • Short-Circuit Protection
  • Driver Propagation Delay: 10 ns
  • Receiver Propagation Delay: 15 ns
  • High Z Outputs with Power Off
  • Superior Upgrade for LTC485

Functional Block Diagram for ADM485

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
ADM485: 5 V Low Power EIA RS-485 Transceiver Data Sheet  (Rev F, 04/2008) (pdf, 254 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
EMC, CE Mark, IEC801... What's it all about?
... New devices to ease the job.
(Analog Dialogue, Vol. 30, No. 4)
Analog Dialogue HTML
Interface Parametric Search Product Selection Guide HTML
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

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADM485 IBIS Model IBIS Models 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

ADM485 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM485AN Status: Production 8 ld PDIP 8 Ind Tube, 50 $2.24 $2.01 N  Material Info PCN Purchase
ADM485ANZ Status: Production 8 ld PDIP 8 Ind Tube, 50 $1.93 $1.74 Y  Material Info PCN Purchase
ADM485AR Status: Production 8 ld SOIC 8 Ind Tube, 98 $2.24 $2.01 N  Material Info PCN Purchase
ADM485AR-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $2.01 N  Material Info PCN Purchase
ADM485ARM Status: Obsolete 8 ld MSOP 8 Ind Tube, 50 - - N  Material Info PCN/PDN Contact ADI
ADM485ARM-REEL Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 3000 - - N  Material Info PCN/PDN Contact ADI
ADM485ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $2.01 $1.82 Y  Material Info PCN Purchase Sample
ADM485ARMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $1.82 Y  Material Info PCN Purchase
ADM485ARMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $1.82 Y  Material Info PCN Purchase
ADM485ARZ Status: Production 8 ld SOIC 8 Ind Tube, 98 $1.93 $1.74 Y  Material Info PCN Purchase Sample
ADM485ARZ-REEL Status: Production 8 ld SOIC 8 Ind Reel, 2500 - $1.74 Y  Material Info PCN Purchase
ADM485JN Status: Last Time Buy 8 ld PDIP 8 Comm. Tube, 50 $1.68 $1.51 N  Material Info PCN/PDN Purchase
ADM485JNZ Status: Production 8 ld PDIP 8 Comm. Tube, 50 $1.61 $1.44 Y  Material Info PCN Purchase
ADM485JR Status: Obsolete 8 ld SOIC 8 Comm. Tube, 98 - - N  Material Info PCN/PDN Contact ADI
ADM485JR-REEL Status: Obsolete 8 ld SOIC 8 Comm. Reel, 2500 - - N  Material Info PCN/PDN Contact ADI
ADM485JR-REEL7 Status: Obsolete 8 ld SOIC 8 Comm. Reel, 1000 - - N  Material Info PCN/PDN Contact ADI
ADM485JRZ Status: Production 8 ld SOIC 8 Comm. Tube, 98 $1.46 $1.31 Y  Material Info PCN Purchase Sample
ADM485JRZ-REEL Status: Production 8 ld SOIC 8 Comm. Reel, 2500 - $1.31 Y  Material Info PCN Purchase
ADM485JRZ-REEL7 Status: Production 8 ld SOIC 8 Comm. Reel, 1000 - $1.31 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.

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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