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ADM3485EARZ-REEL Datasheet(PDF) 1 Page - Analog Devices |
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ADM3485EARZ-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page ±15 kV ESD-Protected, 3.3 V,12 Mbps, EIA RS-485/RS-422 Transceiver ADM3485E Rev. D Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2000-2010 Analog Devices, Inc. All rights reserved. FEATURES TIA/EIA RS-485/RS-422 compliant ±15 kV ESD protection on RS-485 input/output pins 12 Mbps data rate Half-duplex transceiver Up to 32 nodes on the bus Receiver open-circuit, fail-safe design Low power shutdown current 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 narrow SOIC package APPLICATIONS Power/energy metering Telecommunications EMI-sensitive systems Industrial control Local area networks FUNCTIONAL BLOCK DIAGRAM ADM3485E RO RE DE DI B A R D Figure 1. GENERAL DESCRIPTION The ADM3485E is a 3.3 V, low power data transceiver with ±15 kV ESD protection, suitable for half-duplex communi- cation on multipoint bus transmission lines. The ADM3485E is designed for balanced data transmission and complies with TIA/EIA standards RS485 and RS-422. The ADM3485E is a half-duplex transceiver that shares differential lines and has separate enable inputs for the driver and the 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. The receiver has a fail-safe feature that ensures a logic high output when the inputs are floating. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. The part is fully specified over the industrial temperature range and is available in an 8-lead narrow SOIC package. |
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