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ADM2490E Datasheet(PDF) 1 Page - Analog Devices

Part No. ADM2490E
Description  High Speed, ESD-Protected, Full-Duplex, iCoupler, Isolated RS-485 Transceiver
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADM2490E Datasheet(HTML) 1 Page - Analog Devices

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High Speed, ESD-Protected, Full-Duplex,
iCoupler
®, Isolated RS-485 Transceiver
ADM2490E
Rev. 0
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
Isolated, full-duplex RS-485/RS-422 transceiver
±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 V operation (VDD1)
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 pending
UL recognition: 5000 V rms isolation voltage
for 1 minute per UL 1577
VDE certificate of conformity
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000
VIORM = 848 VPEAK
Operating temperature range: −40°C to +105°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
RxD
ADM2490E
Figure 1.
GENERAL DESCRIPTION
The ADM2490E is an isolated data transceiver with ±8 kV ESD
protection and is suitable for high speed, full-duplex
communication on multipoint transmission lines. It 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 2-channel isolator, a 3-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 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 where bus
contention could cause excessive power dissipation.


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