ADM3485_15 datasheet, PDF - EEWORLD Datasheet

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ADM3485_15: DescriptionFull-Duplex, RS-485/RS-422 Transceivers; File Size306KB，20 Pages; ManufacturerADI; Websitehttps://www.analog.com

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ADM3485_15 Overview

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

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3.3 V Slew Rate Limited, Half- and

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

Data Sheet

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

ADM3483/ADM3485/ADM3488/ADM3490/ADM3491

FUNCTIONAL BLOCK DIAGRAMS

ADM3483/

ADM3485

05524-027

GND

Figure 1.

APPLICATIONS

Low power RS-485/RS-422 applications

Telecom

Industrial process control

HVAC

ADM3488/

ADM3490

GND

05524-026

05524-025

Figure 2.

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

ADM3491

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.

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

Tel: 781.329.4700

www.analog.com

ADM3483/ADM3485/ADM3488/ADM3490/ADM3491

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagrams............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 4

Timing Specifications—ADM3485/ADM3490/ADM3491.... 5

Timing Specifications—ADM3483/ADM3488........................ 5

Timing Specifications—

ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 ...... 6

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configurations and Function Descriptions ........................... 8

Typical Performance Characteristics ............................................. 9

Test Circuits..................................................................................... 11

Data Sheet

Switching Characteristics .............................................................. 13

Circuit Description......................................................................... 14

Devices with Receiver/Driver Enables

(ADM3483/ADM3485/ADM3491)......................................... 14

Devices Without Receiver/Driver Enables—

ADM3488/ADM3490................................................................ 14

Reduced EMI and Reflections (ADM3483/ADM3488) ....... 14

Low Power Shutdown Mode

(ADM3483/ADM3485/ADM3491)......................................... 14

Driver Output Protection.......................................................... 14

Propagation Delay ...................................................................... 14

Typical Applications................................................................... 14

Line Length vs. Data Rate ......................................................... 15

Outline Dimensions ....................................................................... 17

Ordering Guide .......................................................................... 18

REVISION HISTORY

11/11—Rev. D to Rev. E

Changes to Digital I/O Voltage (DE, RE, DI) Parameter,

Table 6 ................................................................................................ 7

Moved Typical Performance Characteristics Section .................. 9

Moved Test Circuits Section.......................................................... 11

Moved Switching Characteristics Section ................................... 13

Changes to Note 1, Table 8 ............................................................ 14

Changes to Outline Dimensions................................................... 17

12/10—Rev. C to Rev. D

Changes to Figure 33...................................................................... 15

8/10—Rev. B to Rev. C

Changes to Table 2, Driver Input Logic......................................... 4

10/06—Rev. A to Rev. B

Updated Format..................................................................Universal

Added ADM3491 ...............................................................Universal

Changes to Specifications Section...................................................4

Changes to Typical Applications Section .................................... 14

7/06—Rev. 0 to Rev. A

Changes to Applications ...................................................................1

Changes to General Description .....................................................1

Changes to Figure 19...................................................................... 10

Changes to Typical Applications Section .................................... 13

Changes to Figure 31 and Figure 32............................................. 14

Updated Outline Dimensions....................................................... 15

10/05—Revision 0: Initial Version

Rev. E | Page 2 of 20

ADM3485_15 Related Products

	ADM3485_15	ADM3488_15	ADM3490_15	ADM3491_15	ADM3483_15
Description	Full-Duplex, RS-485/RS-422 Transceivers	Full-Duplex, RS-485/RS-422 Transceivers	Full-Duplex, RS-485/RS-422 Transceivers	Full-Duplex, RS-485/RS-422 Transceivers	Full-Duplex, RS-485/RS-422 Transceivers

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