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ADM3491E Dataheets PDF



Part Number ADM3491E
Manufacturers Analog Devices
Logo Analog Devices
Description (ADM3483E - ADM3491E) low power data transceivers
Datasheet ADM3491E DatasheetADM3491E Datasheet (PDF)

www.DataSheet4U.com 3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E FEATURES TIA/EIA RS-485/RS-422 compliant ±15 kV ESD protection on RS-485 input/output pins Data rates ADM3483E/ADM3488E: 250 kbps ADM3486E: 2.5 Mbps ADM3490E/ADM3491E: 12 Mbps Half- and full-duplex options Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current (ADM3483E/ADM3486E/ADM3491E only) Outputs high-Z when di.

  ADM3491E   ADM3491E


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www.DataSheet4U.com 3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E FEATURES TIA/EIA RS-485/RS-422 compliant ±15 kV ESD protection on RS-485 input/output pins Data rates ADM3483E/ADM3488E: 250 kbps ADM3486E: 2.5 Mbps ADM3490E/ADM3491E: 12 Mbps Half- and full-duplex options Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current (ADM3483E/ADM3486E/ADM3491E only) Outputs high-Z when disabled or powered off Common-mode input range: −7 V to +12 V Thermal shutdown and short-circuit protection Industry-standard 75176 pinout 8-lead and 14-lead narrow SOIC packages FUNCTIONAL BLOCK DIAGRAMS VCC ADM3483E/ ADM3486E RO RE DE DI D 06284-001 R A B GND Figure 1. VCC ADM3488E/ ADM3490E RO R A B APPLICATIONS Power/energy metering Telecommunications EMI-sensitive systems Industrial control Local area networks DI D Z Y 06284-002 GND Figure 2. VCC GENERAL DESCRIPTION The ADM3483E/ADM3486E/ADM3488E/ADM3490E/ ADM3491E are 3.3 V, low power data transceivers with ±15 kV ESD protection suitable for full- and half-duplex communication on multipoint bus transmission lines. They are designed for balanced data transmission, and they comply with TIA/EIA standards RS­485 and RS-422. The ADM3483E/ADM3486E are half-duplex transceivers that share differential lines and have separate enable inputs for the driver and receiver. The full-duplex ADM3488E/ ADM3490E/ADM3491E transceivers have dedicated differential line driver outputs and receiver inputs. The ADM3491E also features separate enable inputs for the driver and receiver. The devices have a 12 kΩ receiver input impedance, which allows up to 32 transceivers on a bus. Because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. ADM3491E RO RE DE DI D Z Y 06284-003 R A B GND Figure 3. (continued on Page 3) Rev. A 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: 781.461.3113 ©2006 Analog Devices, Inc. All rights reserved. www.DataSheet4U.com ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 4 Driver Timing Specifications...................................................... 5 Receiver Timing Specifications .................................................. 6 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Test Circuits and Switching Characteristics.................................. 9 Typical Performance Characteristics ........................................... 11 Circuit Description......................................................................... 14 Devices with Receiver/Driver Enable—ADM3483E/ ADM3486E/ADM3491E ........................................................... 14 Devices Without Receiver/Driver Enable―ADM3488E/ ADM3490E ................................................................................. 14 Low Power Shutdown Mode—ADM3483E/ADM3486E / ADM3491E ................................................................................. 14 Driver Output Protection.......................................................... 14 Propagation Delay ...................................................................... 14 Line Length vs. Data Rate ......................................................... 14 ±15 kV ESD Protection ............................................................. 15 Human Body Model .................................................................. 15 Typical Applications................................................................... 15 Outline Dimensions ...................................................


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