ADM3072EYRZ-REEL7 Analog Devices

B B 3.3 V, 15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E FEATURES FUNCTIONAL BLOCK DIAGRAMS V CC TIA/EIA RS-485/RS-422 compliant 15 kV ESD protection on RS-485 input/output pins ADM3070E/ ADM3073E/ Data rates ADM3076E ADM3070E/ADM3071E/ADM3072E: 250 kbps A RO R ADM3073E/ADM3074E/ADM3075E: 500 kbps RE ADM3076E/ADM3077E/ADM3078E: 16 Mbps DE Half- and full-duplex options Z True fail-safe receiver inputs DI D Y Up to 256 nodes on the bus 40C to +125C temperature option GND RE Hot-swap input structure on DE and pins Figure 1. Reduced slew rates for low EMI V CC Low power shutdown current (all except ADM3071E/ ADM3074E/ADM3077E) ADM3071E/ ADM3074E/ Outputs high-Z when disabled or powered off ADM3077E Common-mode input range: 7 V to +12 V A RO R Thermal shutdown and short-circuit protection 8-lead and 14-lead narrow SOIC packages APPLICATIONS Z DI D Y Power/energy metering Industrial control GND Lighting systems Figure 2. Telecommunications Security systems V CC Instrumentation ADM3072E/ ADM3075E/ GENERAL DESCRIPTION ADM3078E The ADM307xE are 3.3 V, low power data transceivers with R RO 15 kV ESD protection suitable for full- and half-duplex RE A communication on multipoint bus transmission lines. They DE B are designed for balanced data transmission, and they comply DI D with TIA/EIA standards: RS-485 and RS-422. The devices have a unit load receiver input impedance, which GND allows up to 256 transceivers on a bus. Because only one driver Figure 3. should be enabled at any time, the output of a disabled or powered- down driver is tristated to avoid overloading the bus. The receiver inputs have a true fail-safe feature, which eliminates the need for external bias resistors and ensures a logic high output level when the inputs are open or shorted. This guar- antees that the receiver outputs are in a known state before communication begins and when communication ceases. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20062009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06285-003 06285-001 06285-002ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E TABLE OF CONTENTS Typical Performance Characteristics ........................................... 12 Features .............................................................................................. 1 Circuit Description......................................................................... 15 Applications ....................................................................................... 1 Function Tables ........................................................................... 15 General Description ......................................................................... 1 Receiver Fail-Safe ....................................................................... 15 Functional Block Diagrams ............................................................. 1 Hot-Swap Capability .................................................................. 16 Revision History ............................................................................... 2 Line Length vs. Data Rate ......................................................... 16 Specif icat ions ..................................................................................... 4 15 kV ESD Protection ............................................................. 16 Timing Specifications ADM3070E/ADM3071E/ADM3072E ....................................... 5 Human Body Model .................................................................. 16 Timing Specifications 256 Transceivers on the Bus ...................................................... 16 ADM3073E/ADM3074E/ADM3075E ....................................... 6 Reduced EMI and Reflections .................................................. 16 Timing Specifications Low Power Shutdown Mode ..................................................... 17 ADM3076E/ADM3077E/ADM3078E ....................................... 7 Driver Output Protection .......................................................... 17 Absolute Maximum Ratings ............................................................ 8 Typical Applications ................................................................... 17 ESD Caution .................................................................................. 8 Outline Dimensions ....................................................................... 19 Pin Configurations and Function Descriptions ........................... 9 Ordering Guide .......................................................................... 20 Test Circuits and Switching Characteristics ................................ 10 REVISION HISTORY 8/09Rev. D to Rev. E Changes to Ordering Guide .......................................................... 20 4/09Rev. C to Rev. D Changes to Ordering Guide .......................................................... 20 1/09Rev. B to Rev. C Changes to Ordering Guide .......................................................... 20 8/08Rev. A to Rev. B Changes to Table 3 ............................................................................ 5 Changes to Figure 36 ...................................................................... 18 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 20 10/06Rev. 0 to Rev. A Added ADM3077E and ADM3078E ............................... Universal Changes to Figure 2 and Figure 3 ................................................... 1 Changes to Figure 5 and Figure 6 ................................................... 9 Changes to Figure 34 and Figure 35 ............................................. 17 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 20 8/06Revision 0: Initial Version Rev. E | Page 2 of 20