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ADM3251EARWZ-REEL Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer ADM3251EARWZ-REEL
Bauteilbeschribung  Isolated, Single-Channel RS-232 Line Driver/Receiver
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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Isolated, Single-Channel
RS-232 Line Driver/Receiver
ADM3251E
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
2.5 kV fully isolated (power and data) RS-232 transceiver
isoPower integrated, isolated dc-to-dc converter
460 kbps data rate
1 Tx and 1 Rx
Meets EIA/TIA-232E specifications
ESD protection on RIN and TOUT pins
±8 kV: contact discharge
±15 kV: air gap discharge
0.1 μF charge pump capacitors
High common-mode transient immunity: >25 kV/μs
Safety and regulatory approvals (pending)
UL recognition
2500 V rms for 1 minute per UL 1577
VDE Certificate of Conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
VIORM = 560 V peak
Operating temperature range: −40°C to +85°C
Wide body, 20-lead SOIC package
APPLICATIONS
High noise data communications
Industrial communications
General-purpose RS-232 data links
Industrial/telecommunications diagnostic ports
Medical equipment
FUNCTIONAL BLOCK DIAGRAM
DECODE
RECT
REG
V–
C4
0.1µF
16V
VOLTAGE
DOUBLER
C1+ C1– V+
VISO
C2+ C2–
R
T
VOLTAGE
INVERTER
VCC
ROUT
TIN
GND
GNDISO
RIN*
TOUT
ADM3251E
OSC
ENCODE
ENCODE
DECODE
*5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUT.
0.1µF
C3
0.1µF
10V
C2
0.1µF
16V
0.1µF
C1
0.1µF
16V
Figure 1.
GENERAL DESCRIPTION
The ADM3251E is a high speed, 2.5 kV fully isolated, single-
channel RS-232/V.28 transceiver device that operates from a
single 5 V power supply. Due to the high ESD protection on the
RIN and TOUT pins, the device is ideally suited for operation in
electrically harsh environments or where RS-232 cables are
frequently being plugged and unplugged.
The ADM3251E incorporates dual-channel digital isolators with
isoPower™ integrated, isolated power. There is no requirement
to use a separate isolated dc-to-dc converter. Chip-scale trans-
former iCoupler® technology from Analog Devices, Inc., is used
both for the isolation of the logic signals as well as for the
integrated dc-to-dc converter. The result is a total isolation
solution.
The ADM3251E conforms to the EIA/TIA-232E and ITU-T V. 28
specifications and operates at data rates up to 460 kbps.
Four external 0.1 μF charge pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
5 V supply.
The ADM3251E is available in a 20-lead, wide body SOIC package
and is specified over the −40°C to +85°C temperature range.


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