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EVAL-ADM3251EEBZ

更新时间： 2024-01-07 08:41:09
品牌 Logo 应用领域
亚德诺 - ADI 驱动器
页数 文件大小 规格书
16页 261K
描述
Isolated, Single-Channel RS-232 Line Driver/Receiver

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Isolated, Single-Channel  
RS-232 Line Driver/Receiver  
ADM3251E  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
C1  
0.1µF  
16V  
C3  
0.1µF  
10V  
C2  
0.1µF  
16V  
C4  
0.1µF  
16V  
2.5 kV fully isolated (power and data) RS-232 transceiver  
isoPower integrated, isolated dc-to-dc converter  
460 kbps data rate  
0.1µF  
V
1 Tx and 1 Rx  
V+  
ISO  
C1+ C1–  
C2+  
V–  
C2–  
VOLTAGE  
DOUBLER  
VOLTAGE  
INVERTER  
ADM3251E  
Meets EIA/TIA-232E specifications  
ESD protection on RIN and TOUT pins  
8 kV: contact discharge  
V
CC  
RECT  
REG  
OSC  
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  
0.1µF  
DECODE  
ENCODE  
ENCODE  
DECODE  
R
T
*
IN  
R
T
R
OUT  
OUT  
T
IN  
2500 V rms for 1 minute per UL 1577  
VDE Certificate of Conformity  
GND  
GND  
ISO  
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON THE RS-232 INPUT.  
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  
Figure 1.  
APPLICATIONS  
High noise data communications  
Industrial communications  
General-purpose RS-232 data links  
Industrial/telecommunications diagnostic ports  
Medical equipment  
GENERAL DESCRIPTION  
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 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 conforms to the EIA/TIA-232E and ITU-T V. 28  
specifications and operates at data rates up to 460 kbps.  
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.  
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.  
The ADM3251E contains isoPower technology that uses high  
frequency switching elements to transfer power through the  
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 registeredtrademarks arethe 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.  
 
 
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