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ADM3483 Datasheet(PDF) 1 Page - Analog Devices |
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ADM3483 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 3.3 V Slew Rate Limited, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES Operate with 3.3 V supply Interoperable with 5 V logic EIA RS-422 and RS-485 compliant over full common-mode range Data rate options ADM3483/ADM3488: 250 kbps ADM3485/ADM3490/ADM3491: 10 Mbps Half- and full-duplex options Reduced slew rates for low EMI (ADM3483 and ADM3488) 2 nA supply current in shutdown mode (ADM3483/ADM3485/ADM3491) Up to 32 transceivers on the bus −7 V to +12 V bus common-mode range Specified over the –40°C to +85°C temperature range 8 ns skew (ADM3485/ADM3490/ADM3491) 8-lead SOIC and 14-lead SOIC (ADM3491 only) packages APPLICATIONS Low power RS-485/RS-422 applications Telecom Industrial process control HVAC GENERAL DESCRIPTION The ADM3483/ADM3485/ADM3488/ADM3490/ADM3491 are low power, differential line transceivers designed to operate using a single 3.3 V power supply. Low power consumption, coupled with a shutdown mode, makes the ADM3483/ADM3485/ADM3488/ ADM3490/ADM3491 ideal for power-sensitive applications. The ADM3488/ADM3490/ADM3491 feature full-duplex com- munication, while the ADM3483/ADM3485 are designed for half-duplex communication. FUNCTIONAL BLOCK DIAGRAMS R D RO VCC RE DI DE ADM3483/ ADM3485 A GND B Figure 1. R D RO DI ADM3488/ ADM3490 A B Z Y VCC GND Figure 2. R D RO RE DI DE ADM3491 A B Z Y Figure 3. The ADM3483/ADM3488 feature slew rate limited drivers that minimize EMI and reduce reflections caused by improperly ter- minated cables, allowing error-free data transmission at data rates up to 250 kbps. The ADM3485/ADM3490/ADM3491 transmit at up to 10 Mbps. The receiver input impedance is 12 kΩ, allowing up to 32 trans- ceivers to be connected on the bus. A thermal shutdown circuit prevents excessive power dissipation caused by bus contention or by output shorting. If a significant temperature increase is detected in the internal driver circuitry during fault conditions, then the thermal shutdown circuit forces the driver output into a high impedance state. If the inputs are unconnected (floating), the receiver contains a fail-safe feature that results in a logic high output state. The parts are fully specified over the commercial and industrial temperature ranges. The ADM3483/ADM3485/ ADM3488/ADM3490 are available in 8-lead SOIC_N; the ADM3491 is available in a 14-lead SOIC_N. |
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