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ADM4856 Dataheets PDF



Part Number ADM4856
Manufacturers Analog Devices
Logo Analog Devices
Description Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers
Datasheet ADM4856 DatasheetADM4856 Datasheet (PDF)

5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857 FEATURES EIA RS-485-/RS-422-compliant Data rate options ADM4850/ADM4854: 115 kbps ADM4851/ADM4855: 500 kbps ADM4852/ADM4856: 2.5 Mbps ADM4853/ADM4857: 10 Mbps Half- and full-duplex options Reduced slew rates for low EMI True fail-safe receiver inputs 5 μA (maximum) supply current in shutdown mode Up to 256 transceivers on one bus Outputs high-Z when disab.

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5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857 FEATURES EIA RS-485-/RS-422-compliant Data rate options ADM4850/ADM4854: 115 kbps ADM4851/ADM4855: 500 kbps ADM4852/ADM4856: 2.5 Mbps ADM4853/ADM4857: 10 Mbps Half- and full-duplex options Reduced slew rates for low EMI True fail-safe receiver inputs 5 μA (maximum) supply current in shutdown mode Up to 256 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 the MAX308x Specified over the −40°C to +85°C temperature range Available in 8-lead SOIC, LFCSP, and MSOP packages Qualified for automotive applications FUNCTIONAL BLOCK DIAGRAMS VCC ADM4850/ADM4851/ ADM4852/ADM4853 RO RE DE DI D 04931-001 R A B GND Figure 1. VCC ADM4854/ADM4855/ ADM4856/ADM4857 A RO R B Z DI D Y 04931-028 APPLICATIONS Low power RS-485 applications EMI-sensitive systems DTE-DCE interfaces Industrial control Packet switching Local area networks Level translators GND Figure 2. GENERAL DESCRIPTION The ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ ADM4855/ADM4856/ADM4857 are differential line transceivers suitable for high speed half- and full-duplex data communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with EIA Standards RS-485 and RS-422. The ADM4850/ADM4851/ADM4852/ADM4853 are halfduplex transceivers that share differential lines and have separate enable inputs for the driver and receiver. The full-duplex ADM4854/ADM4855/ADM4856/ADM4857 transceivers have dedicated differential line driver outputs and receiver inputs. The parts have a 1/8-unit-load receiver input impedance, which allows up to 256 transceivers on one bus. Because 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. The receiver inputs have a true fail-safe feature, which ensures a logic high output level when the inputs are open or shorted. This guarantees that the receiver outputs are in a known state Rev. D 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. before communication begins and when communication ends. 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 with a thermal shutdown circuit. The parts are fully specified over the commercial and industrial temperature ranges and are available in 8-lead SOIC, LFCSP (ADM4850/ADM4851/ADM4852/ADM4853), and MSOP (ADM4850 only) packages. Table 1. Selection Table Part No. ADM4850 ADM4851 ADM4852 ADM4853 ADM4854 ADM4855 ADM4856 ADM4857 Half-/Full-Duplex Half Half Half Half Full Full Full Full Data Rate 115 kbps 500 kbps 2.5 Mbps 10 Mbps 115 kbps 500 kbps 2.5 Mbps 10 Mbps 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 ©2004–2012 Analog Devices, Inc. All rights reserved. ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagrams............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 ADM4850/ADM4854 Timing Specifications........................... 4 ADM4851/ADM4855 Timing Specifications........................... 4 ADM4852/ADM4856 Timing Specifications........................... 5 ADM4853/ADM4857 Timing Specifications........................... 5 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... 7 Typical Performance Characteristics ............................................. 9 Test Circuits..................................................................................... 11 Switching Characteristics ......


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