High Speed, ESD-Protected, Full-Duplex,

iCoupler

ADM2490E

Rev. 0

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FEATURES

Isolated, full-duplex RS-485/RS-422 transceiver

±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)

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 pending

UL recognition: 5000 V rms isolation voltage

for 1 minute per UL 1577

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

Operating temperature range: −40°C to +105°C

Wide-body, 16-lead SOIC package

APPLICATIONS

Isolated RS-485/RS-422 interfaces

Industrial field networks

INTERBUS

Multipoint data transmission systems

FUNCTIONAL BLOCK DIAGRAM

A

B

Y

Z

TxD

RxD

ADM2490E

Figure 1.

GENERAL DESCRIPTION

The ADM2490E is an isolated data transceiver with ±8 kV ESD

protection and is suitable for high speed, full-duplex

communication on multipoint transmission lines. It 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 2-channel isolator, a 3-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 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 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.