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ADM2486BRW

High Speed, Half-Duplex iCoupler Isolated RS-485 Transceiver

Analog Devices 

FEATURES

Half-duplex, isolated RS-485 transceiver

PROFIBUS®-compliant

ANSI EIA/TIA 485-A and ISO 8482: 1987(E) compliant

20 Mbps data rate

5 V or 3 V operation (VDD1)

High common-mode transient immunity: >25 kV/μs

Isolated DE status output

Receiver open-circuit, fail-safe design

Thermal shutdown protection

50 nodes on bus

Safety and regulatory approvals

UL recognition—2500 Vrms for 1 minute per UL 1577

CSA Component Acceptance Notice #5A

VDE Certificate of Conformity

DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01

DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000

VIORM = 560 V peak

Operating temperature range: −40°C to +85°C

Wide body, 16-lead SOIC package

APPLICATIONS

Isolated RS-485/RS-422 interfaces

PROFIBUS networks

Industrial field networks

Multipoint data transmission systems

GENERAL DESCRIPTION

The ADM2486 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 EIA/TIA-485-A and ISO 8482: 1987(E).

High Speed, Half-Duplex iCoupler®

Isolated RS-485 Transceiver

ADM2486

FUNCTIONAL BLOCK DIAGRAM

VDD1

VDD2

ADM2486

RTS

DE

TxD

PV

A

RxD

B

RE

GND1

GND2

Figure 1.

The device employs Analog Devices’ 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 V supply, and the bus side uses an isolated 5 V supply.

The ADM2486 driver has an active-high enable feature. 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 feature 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.

Rev. C

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved.

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