ADM383 데이터 시트보기 (PDF) - Analog Devices

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ADM383

5 V Low Power, Slew-Rate Limited RS-485/RS-422 Transceiver

Analog Devices 

FEATURES

EIA RS-485/RS-422-compliant

Data rates up to 250 kbps

Slew-rate limited for low EMI

100 nA supply current in shutdown mode

Low power consumption (120 µA)

Up to 32 transceivers on one bus

Outputs high-z when disabled or powered off

–7 V to +12 V bus common-mode range

Thermal shutdown and short-circuit protection

Pin-compatible with MAX483

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

Available in 8-lead SOIC package

APPLICATIONS

Low power RS-485 applications

EMI sensitive systems

DTE-DCE interfaces

Industrial control

Packet switching

Local area networks

Level translators

5 V Low Power, Slew-Rate Limited

RS-485/RS-422 Transceiver

ADM483

FUNCTIONAL BLOCK DIAGRAM

VCC

ADM483

RO

R

A

RE

DE

B

DI

D

GND

Figure 1.

GENERAL DESCRIPTION

The ADM483 is a low power differential line transceiver suitable

for half-duplex data communication on multipoint bus trans-

mission lines. It is designed for balanced data transmission, and

complies with EIA Standards RS-485 and RS-422.The part

contains a differential line driver and a differential line receiver.

Both share the same differential pins, with either the driver or

the receiver being enabled at any given time.

The device has an input impedance of 12 kΩ, allowing up to

32 transceivers on one bus. Since only one driver should be

enabled at any time, the output of a disabled or powered-down

driver is three-stated to avoid overloading the bus. This high

impedance driver output is maintained over the entire

common-mode voltage range from –7 V to +12 V.

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

high output state if the inputs are unconnected (floating).

The driver outputs are slew-rate limited to reduce EMI and data

errors caused by reflections from improperly terminated buses.

Excessive power dissipation caused by bus contention or by

output shorting is prevented by a thermal shutdown circuit.

The part is fully specified over the industrial temperature range,

and is available in an 8-lead SOIC package.

Rev. 0

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: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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