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ADM2491EBRWZ-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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ADM2491EBRWZ-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page High Speed, ESD-Protected, Half-/Full-Duplex i Coupler Isolated RS-485 Transceiver ADM2491E Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 ©2007–2010 Analog Devices, Inc. All rights reserved. FEATURES Isolated, RS-485/RS-422 transceiver, configurable as half- or full-duplex ±8 kV ESD protection on RS-485 input/output pins 16 Mbps data rate Complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E) Suitable for 5 V or 3.3 V operation (V DD1) High common-mode transient immunity: >25 kV/μs Receiver has open-circuit, fail-safe design 32 nodes on the bus Thermal shutdown protection Safety and regulatory approvals UL recognition: 5000 V rms isolation voltage for 1 minute, per UL 1577 VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12 Reinforced insulation, V IORM = 848 V peak Operating temperature range: −40°C to +85°C Wide body, 16-lead SOIC package APPLICATIONS Isolated RS-485/RS-422 interfaces Industrial field networks INTERBUS Multipoint data transmission systems FUNCTIONAL BLOCK DIAGRAM VDD1 GND1 A B VDD2 GND2 Y Z TxD DE RxD ADM2491E RE Figure 1. GENERAL DESCRIPTION The ADM2491E is an isolated data transceiver with ±8 kV ESD protection and is suitable for high speed, half- or full-duplex communication on multipoint transmission lines. For half- duplex operation, the transmitter outputs and the receiver inputs share the same transmission line. Transmitter output Pin Y is linked externally to receiver input Pin A, and transmit- ter output Pin Z is linked to receiver input Pin B. The ADM2491E is designed for balanced transmission lines and complies with ANSI TIA/EIA RS-485-A-1998 and ISO 8482: 1987(E). The device employs Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a three- state differential line driver, and a differential input receiver into a single package. The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM). The logic side of the device can be powered with either a 5 V or a 3.3 V supply, whereas the bus side requires an isolated 5 V supply. The device has current-limiting and thermal shutdown features to protect against output short circuits and situations in which bus contention could cause excessive power dissipation. The ADM2491E is available in a wide body, 16-lead SOIC package and operates over the −40°C to +85°C temperature range. |
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