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ADM3483

3.3 V Slew Rate Limited, Half- and Full-Duplex, RS-485/RS-422 Transceivers

Analog Devices 

Data Sheet

3.3 V Slew Rate Limited, Half- and

Full-Duplex, RS-485/RS-422 Transceivers

ADM3483/ADM3485/ADM3488/ADM3490/ADM3491

FEATURES

Operate with 3.3 V supply

Interoperable with 5 V logic

EIA RS-422 and RS-485 compliant over full

common-mode range

Data rate options

ADM3483/ADM3488: 250 kbps

ADM3485/ADM3490/ADM3491: 10 Mbps

Half- and full-duplex options

Reduced slew rates for low EMI (ADM3483 and ADM3488)

2 nA supply current in shutdown mode

(ADM3483/ADM3485/ADM3491)

Up to 32 transceivers on the bus

−7 V to +12 V bus common-mode range

Specified over the –40°C to +85°C temperature range

8 ns skew (ADM3485/ADM3490/ADM3491)

8-lead SOIC and 14-lead SOIC (ADM3491 only) packages

APPLICATIONS

Low power RS-485/RS-422 applications

Telecom

Industrial process control

HVAC

GENERAL DESCRIPTION

The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are

low power, differential line transceivers designed to operate using a

single 3.3 V power supply. Low power consumption, coupled with a

shutdown mode, makes the ADM3483/ADM3485/ADM3488/

ADM3490/ADM3491 ideal for power-sensitive applications.

The ADM3488/ADM3490/ADM3491 feature full-duplex com-

munication, while the ADM3483/ADM3485 are designed for

half-duplex communication.

The ADM3483/ADM3488 feature slew rate limited drivers that

minimize EMI and reduce reflections caused by improperly ter-

minated cables, allowing error-free data transmission at data rates

up to 250 kbps.

The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps.

The receiver input impedance is 12 kΩ, allowing up to 32 trans-

ceivers to be connected on the bus. A thermal shutdown circuit

prevents excessive power dissipation caused by bus contention or

by output shorting. If a significant temperature increase is detected

FUNCTIONAL BLOCK DIAGRAMS

VCC

ADM3483/

ADM3485

RO

R

RE

A

DE

B

DI

D

GND

Figure 1.

VCC

A

RO

R

B

ADM3488/

ADM3490

Z

DI

D

Y

GND

Figure 2.

ADM3491

A

RO

R

RE

B

DE

Z

DI

D

Y

Figure 3.

in the internal driver circuitry during fault conditions, then the

thermal shutdown circuit forces the driver output into a high

impedance state. If the inputs are unconnected (floating), the

receiver contains a fail-safe feature that results in a logic high

output state. The parts are fully specified over the commercial

and industrial temperature ranges. The ADM3483/ADM3485/

ADM3488/ADM3490 are available in 8-lead SOIC_N; the

ADM3491 is available in a 14-lead SOIC_N.

Rev. E

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.

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Tel: 781.329.4700

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Fax: 781.461.3113 ©2005-2011 Analog Devices, Inc. All rights reserved.

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