ADM483

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5 V, Slew-Rate Limited, Low Power, 250 kbps, Half Duplex RS-485/RS-422 Transceiver

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $0.81

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Overview

EIA RS-485/RS-422-compliant
Data Rates up to 250 kbps
Slew-rate Limited for Low EMI
100 nA Supply Current in Shutdown Mode
Low Power Consumption (120 µA)
Up to 32 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
Pin-compatible with MAX483
Specified over –40°C to +85°C Temperature Range
Available in 8-lead SOIC Package

The ADM483 is a low power differential line transceiver suitable for half-duplex data communication on multipoint bus trans-mission lines. It is designed for balanced data transmission, and complies with EIA Standards RS-485 and RS-422.The part contains a differential line driver and a differential line receiver. Both share the same differential pins, with either the driver or the receiver being enabled at any given time.

The device has an input impedance of 12 kΩ, allowing up to 32 transceivers on one 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. This high impedance driver output is maintained over the entire common-mode voltage range from –7 V to +12 V.

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

The driver outputs are slew-rate limited 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 by a thermal shutdown circuit.

The part is fully specified over the industrial temperature range, and is available in an 8-lead SOIC package.

Part Models: 2
1ku List Price: Starting From $0.81

Documentation

Data Sheet 1

ADM483: 5 V Low Power, Slew-Rate Limited RS-485/RS-422 Transceiver Data Sheet (Rev.0) 10/01/2004

Application Note 2

AN-1176: Component Footprints and Symbols in the Binary .Bxl File Format 02/07/2014

AN-960: RS-485/RS-422 Circuit Implementation Guide 07/09/2020

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADM483ARZ	8-Lead SOIC	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADM483JRZ	8-Lead SOIC	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Evaluation Kits

Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ

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Product Details

The EVAL-RS485HDEBZ allows quick and easy evaluation of half-duplex RS-485 transceivers with standard 8-lead SOIC footprints. The evaluation board allows interfacing via screw terminal block to digital I/O for driver input (DI), receiver output (RO), driver enable (DE) and receiver output (RO). Bus signals A and B (half-duplex bus) can be connected to a bus screw terminal block. One or two termination resistors can be connected to A and B via jumper settings, in order to evaluation the half-duplex RS-485 driver and receiver. Footprints are provided for pull-up and pull-down (biasing resistors) on the bus.

Devices for evaluation on the board must be ordered separately.

Resources

UG-543:Evaluation Boards for Full-Duplex and Half-Duplex RS-485 Transceivers (Rev.A)
4/19/2013

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