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ADM1490EBRZ データシート(PDF) 1 Page - Analog Devices |
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ADM1490EBRZ データシート(HTML) 1 Page - Analog Devices |
1 / 16 page 16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers ADM1490E/ADM1491E 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 ADM1490E packages Narrow body, 8-lead SOIC 8-lead MSOP ADM1491E 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 DIAGRAMS Figure 1. Figure 2. GENERAL DESCRIPTION The ADM1490E/ADM1491E are RS-485/RS-422 transceivers with ±8 kV ESD protection and are suitable for high speed, full- duplex communication on multipoint transmission lines. In particular, the ADM1490E/ADM1491E are designed for use in motor control applications requiring communications at data rates up to 16 Mbps. The ADM1490E/ADM1491E are designed for balanced trans- mission lines and comply with TIA/EIA-485-A-98. The devices each have 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 ADM1490E/ADM1491E operate from a single 5 V power supply. Excessive 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 shutdown 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 ADM1490E/ADM1491E contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). The ADM1490E/ADM1491E feature extremely fast and closely matched switching times. Minimal driver propagation delays permit transmission at data rates up to 16 Mbps, and low skew minimizes EMI interference. The ADM1490E/ADM1491E are fully specified over the commercial and industrial temperature ranges. The ADM1490E is available in two packages: a narrow body, 8-lead SOIC and an 8-lead MSOP. The ADM1491E is also available in two packages: a narrow body, 14-lead SOIC and a 10-lead MSOP. ADM1490E RO DI A B Z Y VCC GND R D ADM1491E RO RE DE DI A B Z Y GND R D VCC Rev. B 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 ©2008–2009 Analog Devices, Inc. All rights reserved. |
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同様の説明 - ADM1490EBRZ |
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