±15 kV ESD Protected, 3.3 V, RS-232
Line Driver/Receiver
ADM3232E
FEATURES
Data rate: 460 kbps
2 Tx and 2 Rx
Meets EIA-232E specifications
0.1 μF charge pump capacitors
ESD protection to IEC1000-4-2 (801.2)
on TTL/CMOS and RS-232 I/Os
Contact discharge: ±8 kV
Air gap discharge: ±15 kV
FUNCTIONAL BLOCK DIAGRAM
+3.3V INPUT
ADM3232E
C3
0.1µF
6.3V
C4
0.1µF
10V
+
+
+
0.1µF +
10V
0.1µF +
10V
T1
IN
TTL/CMOS
INPUTS
T2
IN
R1
OUT
TTL/CMOS
OUTPUTS
R2
OUT
GND
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT.
06410-001
C1+ +3.3V TO +6.6V V
CC
VOLTAGE
C1–
V+
DOUBLER
C2+ +6.6V TO –6.6V
VOLTAGE
C2–
INVERTER
T1
V–
C5
0.1µF
T1
OUT
RS-232
OUTPUTS
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
Handsets
Industrial/telecom diagnostic ports
T2
R1
5kΩ
R2
5kΩ
T2
OUT
R1
IN
RS-232
INPUTS*
R2
IN
Figure 1.
GENERAL DESCRIPTION
The ADM3232E transceiver is a high speed, 2-channel RS-232/V.28
interface device that operates from a single 3.3 V power supply.
Low power consumption makes it ideal for battery-powered
portable instruments. The ADM3232E conforms to the EIA-232E
and CCITT V.28 specifications and operates at data rates up to
460 kbps.
All RS-232 (T_
OUT
and R_
IN
) and TTL/CMOS (T_
IN
and R_
OUT
)
inputs and outputs are protected against electrostatic discharges
(up to ±15 kV ESD protection). This ensures compliance with
IEC 1000-4-2 requirements.
This device is ideally suited for operation in electrically harsh
environments or where RS-232 cables are frequently plugged/
unplugged, with the ±15 kV ESD protection of the ADM3232E
input/output pins.
Emissions are also controlled to within very strict limits. CMOS
technology is used to keep the power dissipation to an absolute
minimum, allowing maximum battery life in portable applications.
Four external 0.1 μF charge pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
3.3 V supply.
The ADM3232E is available in a 16-lead narrow SOIC package,
as well as a space-saving 16-lead TSSOP.
Rev. 0
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©2006 Analog Devices, Inc. All rights reserved.
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