ANALOG DEVICES ADM3232E Service Manual
±15 kV ESD Protected, 3.3 V, RS-232
T
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FEATURES
Data rate: 460 kbps
2 Tx and 2 Rx
Meets EIA-232E specifications
0.1 μF charge pump capacitors
ESD protection to IEC 1000-4-2 (801.2) on TTL/CMOS and
RS-232 I/Os
Contact discharge: ±8 kV
Air gap discharge: ±15 kV
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
Handsets
Industrial/telecom diagnostic ports
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 ITU-T V.28 specifications and operates at data rates up to
460 kbps.
All RS-232 (Tx
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.
and RxIN) and TTL/CMOS (TxIN and Rx
OUT
OUT
)
Line Driver/Receiver
ADM3232E
FUNCTIONAL BLOCK DIAGRAM
+3.3V INPU
ADM3232E
C1
+
0.1µF
10V
C2
+
0.1µF
10V
T1
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
IN
T2
IN
R1
OUT
R2
OUT
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 and wide SOIC
packages, as well as a space-saving 16-lead TSSOP.
+3.3V TO +6.6V
C1+
C1–
+6.6V TO –6.6V
C2+
C2–
GND
V
5kΩ
5kΩ
CC
V+
V–
T1
T2
R1
R2
C3
+
0.1µF
6.3V
C4
+
0.1µF
10V
OUT
OUT
IN
IN
RS-232
OUTPUTS
RS-232
INPUTS*
VOLTAGE
DOUBLER
VOLTAGE
INVERTER
T1
T2
R1
R2
*INTERNAL 5kΩ PULL-DOWN RESISTOR
ON EACH RS-232 INPUT.
Figure 1.
+
C5
0.1µF
06410-001
Rev. A
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 ©2006–2008 Analog Devices, Inc. All rights reserved.
ADM3232E
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TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
REVISION HISTORY
7/08—Rev. 0 to Rev. A
Added 16-Lead SOIC ......................................................... Universal
Updated Outline Dimensions ......................................................... 9
Changes to Ordering Guide ...........................................................10
12/06—Revision 0: Initial Version
Pin Configuration and Function Descriptions ..............................5
Typical Performance Characteristics ..............................................6
Theory of Operation .........................................................................8
Circuit Description .......................................................................8
High Baud Rate ..............................................................................8
Outline Dimensions ..........................................................................9
Ordering Guide .......................................................................... 10
Rev. A | Page 2 of 12
ADM3232E
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SPECIFICATIONS
VCC = 3.3 V ± 0.3 V, C1 to C4 = 0.1 µF; all specifications T
Table 1.
Parameter Min Typ Max Unit Test Conditions/Comments
DC CHARACTERISTICS
Operating Voltage Range 3.0 3.3 5.5 V
VCC Power Supply Current 1.3 3 mA No load
LOGIC
Input Logic Threshold Low, V
Input Logic Threshold High, V
TTL/CMOS Output Voltage Low, VOL 0.4 V I
TTLCMOS Output Voltage High, VOH VCC − 0.6 V
Logic Pull-Up Current 5 10 μA TIN = GND to VCC
Transmitter Input Hysteresis 0.5 V
RS-232 RECEIVER
Input Voltage Range −30 +30 V
Input Threshold Low 0.6 1.2 V
Input Threshold High 1.6 2.4 V
Input Hysteresis 0.4 V
Input Resistance 3 5 7 kΩ
RS-232 TRANSMITTER
Output Voltage Swing (RS-232) ±5.0 ±5.2 V VCC = 3.3 V, all transmitter outputs loaded with 3 kΩ to ground
Output Voltage Swing (RS-562) ±3.7 V VCC = 3.0 V
Transmitter Output Resistance 300 Ω VCC = 0 V, V
Output Short-Circuit Current (RS-232) ±15 mA
TIMING CHARACTERISTICS
Maximum Data Rate 460 kbps
Receiver Propagation Delay
t
0.4 1 μs
PHL
t
0.4 1 μs
PLH
Transmitter Propagation Delay 300 1.2 μs RL = 3 kΩ, CL = 1000 pF
Receiver Output Enable Time 200 ns
Receiver Output Disable Time 200 ns
Transmitter Skew 30 ns
Receiver Skew 300 ns
Transition Region Slew Rate 5.5 10 30 V/μs
ESD PROTECTION (RS-232 and TTL/
CMOS I/O PINS)
±15 kV Human body model
±15 kV IEC 1000-4-2 air discharge
±8 kV IEC 1000-4-2 contact discharge
0.8 V TIN
INL
2.0 V TIN
INH
MIN
to T
, unless otherwise noted.
MAX
= 1.6 mA
OUT
I
= −1 mA
OUT
= ±2 V
OUT
= 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF, one
V
CC
Tx switching
Measured from +3 V to −3 V or −3 V to +3 V, V
R
= 3 kΩ, CL = 1000 pF, TA = 25°C
L
= 3.3 V;
CC
Rev. A | Page 3 of 12
ADM3232E
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ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
VCC −0.3 V to +6 V
V+ (VCC − 0.3 V) to 14 V
V− +0.3 V to –14 V
Input Voltages
TxIN −0.3 V to (VCC + 0.3 V)
RxIN ±30 V
Output Voltages
Tx
±15 V
OUT
Rx
−0.3 V to (VCC + 0.3 V)
OUT
Short-Circuit Duration
Tx
Continuous
OUT
Power Dissipation R-16/RW-16 450 mW
(Derate 6 mW/°C Above 50°C)
θJA, Thermal Impedance
Power Dissipation RU-16 500 mW
(Derate 6 mW/°C Above 50°C)
θJA, Thermal Impedance
Operating Temperature Range
Industrial (A Version) −40°C to +85°C
Storage Temperature Range −65°C to +150°C
Lead Temperature
(Soldering, 10 sec)
158°C/W
158°C/W
JEDEC industry-standard
J-STD-020
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. A | Page 4 of 12
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