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ADM1491EBRMZ-REEL7 数据表(PDF) 1 Page - Analog Devices |
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ADM1491EBRMZ-REEL7 数据表(HTML) 1 Page - Analog Devices |
1 / 16 page 16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers ADM1491E Rev. 0 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 ©2008 Analog Devices, Inc. All rights reserved. FEATURES RS-485/RS-422 full duplex transceiver, for high speed motor control applications 16 Mbps data rate ±8 kV ESD protection on RS-485 input/output pins Complies with ANSI/TIA/EIA-485-A-1998 Open circuit fail-safe Suitable for 5 V power supply applications 32 nodes on the bus (1 unit load) Thermal shutdown protection Operating temperature range: −40°C to +85°C Packages Narrow-body 14-lead SOIC 10-lead MSOP APPLICATIONS RS-485/RS-422 interfaces Industrial field networks High data rate motor control Multipoint data transmission systems Single-ended to differential signal conversion FUNCTIONAL BLOCK DIAGRAM ADM1491E RO RE DE DI A B Z Y GND R D VCC Figure 1. GENERAL DESCRIPTION The ADM1491E is an RS-485 transceiver with ±8 kV ESD pro- tection and is suitable for high speed, full-duplex communication on multipoint transmission lines. In particular, the ADM1491E is designed for use in motor control applications requiring commu- nications at data rates up to 16 Mbps. The ADM1491E is designed for balanced transmission lines and complies with TIA/EIA-485-A-98. The device has a 12 kΩ receiver input impedance for unit load RS-485 operation allowing up to 32 nodes on the bus. The differential transmitter outputs and receiver inputs feature electrostatic discharge circuitry that provides protection to ±8 kV using the human body model (HBM). The ADM1491E operates from a single 5 V power supply. Exces- sive power dissipation caused by bus contention or output shorting is prevented by short-circuit protection and thermal circuitry. Short-circuit protection circuits limit the maximum output current to ±250 mA during fault conditions. A thermal shut- down circuit senses if the die temperature rises above 150°C and forces the driver outputs into a high impedance state under this condition. The receiver of the ADM1491E contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). The ADM1491E features extremely fast and closely matched switching times. Minimal driver propagation delays permit transmission at data rates up to 16 Mbps while low skew minimizes EMI interference. The ADM1491E is fully specified over the commercial and industrial temperature ranges and is available in two packages: a narrow-body 14-lead SOIC and a 10-lead MSOP. |
类似零件编号 - ADM1491EBRMZ-REEL7 |
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类似说明 - ADM1491EBRMZ-REEL7 |
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