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ADM3251EARWZ 其他数据使用手册 - ADI（亚德诺）
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ADI（亚德诺）
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接口芯片
封装:
SOIC-20
描述:
ANALOG DEVICES ADM3251EARWZ 线路接收器, RS232, 4.5V-5电源, SOIC-20
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ADM3251EARWZ数据手册
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Isolated, Single-Channel
RS-232 Line Driver/Receiver
Data Sheet
ADM3251E
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 R
IN
and T
OUT
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 RS232 data links
Industrial/telecommunications diagnostic ports
Medical equipment
FUNCTIONAL BLOCK DIAGRAM
07388-001
DECODE
RECT REG
V–
C4
0.1µF
16V
VOLTAGE
DOUBLER
C1+ C1–
V+
V
ISO
C2+
C2–
R
T
VOLTAGE
INVERTER
V
CC
R
OUT
T
IN
GND GND
ISO
R
IN
*
T
OUT
ADM3251E
OSC
ENCODE
ENCODE
DECODE
*INTERNAL 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
F
igure 1.
GENERAL DESCRIPTION
The ADM3251E
1
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
R
IN
and T
OUT
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
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.
1
Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.
Rev. G
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