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ADM2484EBRWZ

500 kbps, ESD Protected, Half-/Full-Duplex, iC oupler, Isolated RS-485 Transceiver

Analog Devices 

500 kbps, ESD Protected, Half-/Full-Duplex,

iCoupler, Isolated RS-485 Transceiver

ADM2484E

FEATURES

Isolated, RS-485/RS-422 transceiver, configurable as half- or

full-duplex

±15 kV ESD protection on RS-485 input/output pins

500 kbps 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 (VDD1)

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

True fail-safe receiver inputs

256 nodes on the bus

Thermal shutdown protection

Safety and regulatory approvals

UL recognition

5000 V rms isolation voltage for 1 minute per UL1577

VDE certificate of conformity

DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12

Reinforced insulation, VIORM = 848 V peak

CSA Component Acceptance Notice #5A

IEC 60950-1: 380 V rms (reinforced)

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

Wide body, 16-lead SOIC package

APPLICATIONS

Isolated RS-485/RS-422 interfaces

Industrial field networks

INTERBUS

Multipoint data transmission systems

GENERAL DESCRIPTION

The ADM2484E is an isolated data transceiver with ±15 kV

ESD protection suitable for high speed, half- or full-duplex

communication on multipoint transmission lines. For half-

duplex operation, the transmitter outputs and receiver inputs

share the same transmission line. Transmitter Output Pin Y

links externally to Receiver Input Pin A, and Transmitter

Output Pin Z links externally to Receiver Input Pin B.

Designed for balanced transmission lines, the ADM2484E

complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482:

1987(E). The device employs Analog Devices, Inc., iCoupler®

FUNCTIONAL BLOCK DIAGRAM

VDD1

VDD2

ADM2484E

DE

Y

TxD

Z

A

RxD

B

RE

GND1

Figure 1.

GND2

technology to combine a 3-channel isolator, a three-state

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 up to

±15 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 3.3 V supply.

The device has current-limiting and thermal shutdown features

to protect against output short circuits and situations where bus

contention causes excessive power dissipation.

Rev. C

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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.

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Tel: 781.329.4700

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Fax: 781.461.3113 ©2008–2010 Analog Devices, Inc. All rights reserved.

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