ADM2491E

RECOMMENDED FOR NEW DESIGNS

5 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver

Data Sheet (Rev. C) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.35

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Overview

Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex
±8 kV ESD protection on RS-485 input/output pins
16 Mbps data rate
Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E)
Suitable for 5 V or 3.3 V operation (V_DD1)
High common-mode transient immunity: >25 kV/µs
Receiver has open-circuit, fail-safe design
32 nodes on the bus
Thermal shutdown protection
Safety and regulatory approvals
- UL recognition: 5000 V rms isolation voltage for 1 minute, per UL 1577
- VDE certificate of conformity
  - DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
  - Reinforced insulation, V_IORM = 849 V peak
See data sheet for additional features

The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half-duplex operation, the transmitter outputs and the receiver inputs share the same transmission line. Transmitter output Pin Y is linked externally to receiver input Pin A, and transmitter output Pin Z to receiver input Pin B.

The ADM2491E is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler^® technology to combine a 3-channel isolator, a threestate differential line driver, and a differential input receiver into a single package

The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 5 V supply.

The device has current-limiting and thermal shutdown features to protect against output short circuits and situations where bus contention could cause excessive power dissipation.

The ADM2491E is available in a wide body, 16-lead SOIC package and operates over the −40°C to +85°C temperature range.

Applications

Isolated RS-485/RS-422 interfaces
Industrial field networks
INTERBUS
Multipoint data transmission systems

Part Models: 2
1ku List Price: Starting From $3.35

Documentation

Frequently Asked Question 1

FAQ 05/17/2017

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
ADM2491EBRWZ	16-Lead SOIC Wide	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADM2491EBRWZ-REEL7	16-Lead SOIC Wide	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 13, 2024 - 23_0069 Qualification Notification of Alternate Wafer Fab Site at ADI Limerick for Select Isolator Products
		PCN23_0069_Form Material_Report Qualification Results Summary Delta Qualification Matrix Qualification Results Summary
ADM2491EBRWZ	PRODUCTION
ADM2491EBRWZ-REEL7	PRODUCTION
Sep 22, 2015 - 15_0135 Alternate Assembly Site of Select Isolator Products in 8L/16L SOIC_N, 16L/20L SOIC_W and 16L/20L SOIC_IC at ASE Chungli
		PCN15_0135_Form Material_Report Detailed Change Description Qualification Results Summary
ADM2491EBRWZ	PRODUCTION
ADM2491EBRWZ-REEL7	PRODUCTION
Feb 19, 2015 - 15_0032 Isolator die for RS-485 and CAN Transceiver Products Alternate Fabrication Foundry at ADI, Limerick, Ireland
		PCN15_0032_Form Material_Report Qualification Results Summary Detailed Change Description
ADM2491EBRWZ	PRODUCTION
ADM2491EBRWZ-REEL7	PRODUCTION
Feb 27, 2012 - 11_0066 Qualification of Alternate Fab Foundry Gold Plating Process Site for Isolation Products at ADI Limerick.
		PCN11_0066_Form Material_Report Qualification Plan Summary Flow Chart
ADM2491EBRWZ	PRODUCTION
ADM2491EBRWZ-REEL7	PRODUCTION
Aug 4, 2010 - 10_0117 Halogen Free Material Change for SOIC_W Products at Carsem
		PCN10_0117_Form Material_Report Reliability Report
ADM2491EBRWZ	PRODUCTION
ADM2491EBRWZ-REEL7	PRODUCTION

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

Evaluation Kits

ADM2491E Evaluation Board

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Features and Benefits

Configurable as half/full duplex, isolated RS-485/RS-422 transceivers
Suitable for 5 V or 3.3 V operation on VDD1
Suitable for 5 V operation on VDD2
16 Mbps data rate
32 nodes on bus

Product Details

The EVAL-ADM2491EEBZ allows the isolated ADM2491E RS-485 transceiver to be easily and quickly evaluated. The evaluation board allows all of the input and output functions to be exercised without the need for external components.

The ADM2491E differential bus transceiver is an integrated, galvanically isolated component designed for bidirectional data communication on multipoint bus transmission lines.

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. The logic side of the device is powered with either a 5 V or a 3.3 V supply, and the bus side uses an isolated 5 V supply.

Resources

UG-302: Evaluation Board for the ADM2491E ±8 kV Signal Isolated, High Speed (16 Mbps), ESD Protected, Full/Half Duplex RS-485 Transceiver
8/17/2011

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ADM2491E

Overview

Documentation

Data Sheet 1

User Guide 1

Application Note 3

Technical Articles 2

Safety and Regulatory Compliance 1