ADM3251E_VE View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADM3251E_VE Datasheet PDF : 16 Pages
| |||
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
UL recognition
2500 V rms for 1 minute per UL 1577
VDE Certificate of Conformity
DIN EN 60747-5-2 (VDE 0884 Teil 2): 2003-01
CSA Component Acceptance Notice #5A
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
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 inte-
grated dc-to-dc converter. The result is a total isolation solution.
The ADM3251E contains isoPower technology that uses high
frequency switching elements to transfer power through the
Isolated, Single-Channel
RS-232 Line Driver/Receiver
ADM3251E
FUNCTIONAL BLOCK DIAGRAM
C1
0.1µF
16V
C3
0.1µF
10V 0.1µF
C2
0.1µF
16V
C4
0.1µF
16V
ADM3251E
VCC
0.1µF
ROUT
TIN
OSC
DECODE
ENCODE
C1+ C1– V+ VISO
VOLTAGE
DOUBLER
C2+ C2– V–
VOLTAGE
INVERTER
RECT REG
ENCODE
DECODE
R
RIN*
T
TOUT
GND
GNDISO
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUT.
Figure 1.
transformer. Special care must be taken during printed circuit
board (PCB) layout to meet emissions standards. Refer to
Application Note AN-0971, Control of Radiated Emissions with
isoPower Devices, for details on board layout considerations.
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.
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
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 ©2008–2010 Analog Devices, Inc. All rights reserved.
Share Link: 