EMI/EMC-Compliant, ±15 kV, ESD-Protected
RS-232 Line Drivers/Receivers
ADM202E/ADM1181A
FEATURES
Complies with 89/336/EEC EMC directive
ESD protection to IEC1000-4-2 (801.2)
±8 kV: contact discharge
±15 kV: air-gap discharge
±15 kV: human body model
EFT fast transient/burst immunity (IEC1000-4-4)
Low EMI emissions (EN55022)
230 kbits/s data rate guaranteed
TSSOP package option
Upgrade for MAX202E, 232E, LT1181A
FUNCTIONAL BLOCK DIAGRAMS
5V INPUT
0.1µF
10V
0.1µF
10V
C1+
C1–
C2+
C2–
+5V TO +10V V
CC
VOLTAGE
V+
DOUBLER
+10V TO –10V V–
VOLTAGE
INVERTER
T1
T2
R1
R2
C3
0.1µF
6.3V
C4
0.1µF
10V
T1
OUT
T2
OUT
R1
IN
R2
IN
EIA/TIA-232
OUTPUTS
C5
0.1µF
T1
IN
CMOS
INPUTS
T2
IN
R1
OUT
R2
OUT
CMOS
OUTPUTS
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
PDAs
EIA/TIA-232
INPUTS
*
GND
ADM202E
00066-001
00066-002
*
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 1.
5V INPUT
0.1µF
10V
0.1µF
10V
C1+
C1–
+5V TO +10V V
CC
VOLTAGE
V+
DOUBLER
C4
0.1µF
10V
T1
OUT
T2
OUT
R1
IN
R2
IN
EIA/TIA-232
INPUTS
*
C5
0.1µF
10V
C2+ +10V TO –10V V–
VOLTAGE
C2–
INVERTER
T1
T2
R1
R2
C3
0.1µF
10V
GENERAL DESCRIPTION
The ADM202E and ADM1181A are robust, high speed,
2-channel RS-232/V.28 interface devices that operate from a
single 5 V power supply. Both products are suitable for operation
in harsh electrical environments and are compliant with the EU
directive on EMC (89/336/EEC). Both the level of electromagnetic
emissions and immunity are in compliance. EM immunity
includes ESD protection in excess of ±15 kV on all I/O lines,
fast transient/burst protection (1000-4-4), and radiated
immunity (1000-4-3). EM emissions include radiated and
conducted emissions as required by Information Technology
Equipment EN55022, CISPR22.
The ADM202E and ADM1181A conform to the EIA-232E
and CCITT V.28 specifications and operate at data rates up
to 230 kbps.
Four external 0.1 µF charge-pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
5 V supply.
T1
IN
CMOS
INPUTS
T2
IN
R1
OUT
R2
OUT
EIA/TIA-232
OUTPUTS
CMOS
OUTPUTS
GND
ADM1181A
*
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 2.
The ADM202E provides a robust pin-compatible upgrade for
existing ADM202, ADM232L, or MAX202E/MAX232E sockets.
It is available in a 16-lead PDIP, a wide SOIC, a narrow SOIC,
and a space-saving TSSOP package that is 44% smaller than the
SOIC package.
The ADM1181A provides a robust pin-compatible upgrade for
the LTC1181A, and it is available in a 16-lead PDIP package
and a wide 16-lead SOIC package.
Rev. C
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: 781.326.8703
© 2005 Analog Devices, Inc. All rights reserved.
ADM202E/ADM1181A
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
General Description ......................................................................... 6
Circuit Description....................................................................... 6
Charge-Pump DC-to-DC Voltage Converter....................... 6
Transmitter (Driver) Section .................................................. 6
Receiver Section ....................................................................... 6
High Baud Rate............................................................................. 6
ESD/EFT Transient Protection Scheme .................................... 7
Typical Performance Characteristics ..............................................8
ESD Testing (IEC1000-4-2) ...................................................... 10
Fast Transient/Burst Testing (IEC1000-4-4)........................... 11
IEC1000-4-3 Radiated Immunity ............................................ 12
Emissions/Interference .............................................................. 12
Conducted Emissions ................................................................ 12
Radiated Emissions .................................................................... 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 15
REVISION HISTORY
2/05—Rev. B to Rev. C.
Updated Format..................................................................Universal
Changed Hysteresis Level ..................................................Universal
Change to Specifications.................................................................. 3
Added ESD Caution ......................................................................... 4
Change to Receiver Section............................................................. 6
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 15
2/01—Rev. A to Rev. B.
Deletion of one ESD Rating in
ABSOLUTE MAXIMUM RATINGS............................................. 4
Removal of one column in Table II ................................................ 8
Rev. C | Page 2 of 16
ADM202E/ADM1181A
SPECIFICATIONS
V
CC
= 5.0 V ± 10%, C1 to C4 = 0.1 µF. All specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
DC CHARACTERISTICS
Operating Voltage Range
V
CC
Power Supply Current
LOGIC
Input Logic Threshold Low, V
INL
Input Logic Threshold High, V
INH
CMOS Output Voltage Low, V
OL
CMOS Output Voltage High, V
OH
Logic Pull-Up Current
RS-232 RECEIVER
EIA-232 Input Voltage Range
EIA-232 Input Threshold Low
EIA-232 Input Threshold High
EIA-232 Input Hysteresis
EIA-232 Input Resistance
RS-232 TRANSMITTER
Output Voltage Swing
Transmitter Output Resistance
RS-232 Output Short-Circuit Current
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay
T
PHL
T
PLH
Transmitter Propagation Delay
Transition Region Slew Rate
EM IMMUNITY
ESD Protection (I/O Pins)
Min
4.5
Typ
5.0
2.5
13
Max
5.5
6.0
18
0.8
2.4
0.4
3.5
+12
−30
0.4
±25
+30
1.2
1.6
0.65
5
±9.0
2.4
7
Unit
V
mA
mA
V
V
V
V
µA
V
V
V
V
kΩ
V
Ω
mA
kbps
0.1
0.3
1.0
8
1
1
1.5
30
µs
µs
µs
V/µs
Test Conditions/Comments
No load
R
L
= 3 kΩ to GND
T
IN
T
IN
I
OUT
= 3.2 mA
I
OUT
= −1 mA
T
IN
= 0 V
3
±5.0
300
T
A
= 0°C to 85°C
All transmitter outputs loaded with 3 kΩ to
ground
V
CC
= 0 V, V
OUT
= ±2 V
±10
230
±60
R
L
= 3 kΩ to 7 kΩ, C
L
= 50 pF to 1000 pF
3
R
L
= 3 kΩ, C
L
= 1000 pF
R
L
= 3 kΩ, C
L
= 1000 pF
Measured from +3 V to −3 V, or −3 V to +3 V
Human body model
IEC1000-4-2 air discharge
IEC1000-4-2 contact discharge
IEC1000-4-4
IEC1000-4-3
EFT Protection (I/O Pins)
EMI Immunity
±15
±15
±8 kV
±2
10
kV
kV
kV
kV
V/m
Rev. C | Page 3 of 16
ADM202E/ADM1181A
ABSOLUTE MAXIMUM RATINGS
T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
V
CC
V+
V–
Input Voltages
T
IN
R
IN
Output Voltages
T
OUT
R
OUT
Short-Circuit Duration
T
OUT
Power Dissipation N-16
(Derate 6 mW/°C Above 50°C)
θ
JA
, Thermal Impedance
Power Dissipation R-16
(Derate 6 mW/°C Above 50°C)
θ
JA
, Thermal Impedance
Power Dissipation RU-16
(Derate 6 mW/°C Above 50°C)
θ
JA
, Thermal Impedance
Operating Temperature Range
Industrial (A Version)
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
ESD Rating (MIL-STD-883B) (I/O Pins)
ESD Rating (IEC1000-4-2 Air) (I/O Pins)
ESD Rating (IEC1000-4-2 Contact)
(I/O Pins)
EFT Rating (IEC1000-4-4) (I/O Pins)
Values
−0.3 V to +6 V
(V
CC
− 0.3 V) to +14 V
+0.3 V to −14 V
0.3 V to (V+, +0.3 V)
±30 V
±15 V
–0.3 V to (V
CC
+ 0.3 V)
Continuous
450 mW
117°C/W
450 mW
158°C/W
500 mW
158°C/W
–40°C to +85°C
–65°C to +150°C
300°C
±15 kV
±15 kV
±8 kV
±2 kV
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
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may
affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. C | Page 4 of 16
ADM202E/ADM1181A
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
C1+ 1
V+ 2
C1– 3
C2+ 4
C2– 5
16 V
CC
15 GND
ADM202E
14 T1
OUT
ADM1181A
13 R1
IN
TOP VIEW 12 R1
OUT
(Not to Scale)
V– 6
11 T1
IN
00066-003
T2
OUT
7
R2
IN
8
10 T2
IN
9 R2
OUT
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
16
2
6
15
1, 3
4, 5
10, 11
7, 14
8, 13
9, 12
Mnemonic
V
CC
V+
V−
GND
C1+, C1−
C2+, C2−
T
IN
T
OUT
R
IN
R
OUT
Description
Power Supply Input: 5 V ± 10%.
Internally Generated Positive Supply (+9 V nominal).
Internally Generated Negative Supply (−9 V nominal).
Ground Pin. Must be connected to 0 V.
External Capacitor 1 is connected between these pins. A 0.1 µF capacitor is recommended, but larger
capacitors of up to 47 µF can be used.
External Capacitor 2 is connected between these pins. A 0.1 µF capacitor is recommended, but larger
capacitors of up to 47 µF can be used.
Transmitter (Driver) Inputs. These inputs accept TTL/CMOS levels.
Transmitter (Driver) Outputs. These are RS-232 signal levels (typically ±9 V).
Receiver Inputs. These inputs accept RS-232 signal levels. An internal 5 kΩ pull-down resistor to GND is
connected on each input.
Receiver Outputs. These are CMOS output logic levels.
5V INPUT
0.1µF
10V
+5V TO +10V V
CC
16
VOLTAGE
3
C1–
V+
2
DOUBLER
1
C1+
4
C2+
5V INPUT
0.1µF
10V
0.1µF
10V
+5V TO +10V V
CC
16
VOLTAGE
3
C1–
V+
2
DOUBLER
1
C1+
4
C2+ +10V TO –10V V–
5
C2–
6
C3
0.1µF
6.3V
C4
0.1µF
10V
T1
OUT
T2
OUT
R1
IN
R2
IN
C5
0.1µF
0.1µF
10V
T1
IN
CMOS
INPUTS
T2
IN
R1
OUT
R2
OUT
+10V TO –10V V–
6
VOLTAGE
5
C2–
INVERTER
T1
T2
R1
R2
14
VOLTAGE
INVERTER
T1
T2
R1
R2
14
C4
0.1µF
10V
T1
OUT
T2
OUT
R1
IN
R2
IN
C3
0.1µF
10V
C5
0.1µF
10V
11
10
7
EIA/TIA-232
OUTPUTS
T1
IN
CMOS
INPUTS
T2
IN
R1
OUT
R2
OUT
11
10
7
EIA/TIA-232
OUTPUTS
12
13
12
13
CMOS
OUTPUTS
9
EIA/TIA-232
INPUTS
*
CMOS
OUTPUTS
8
9
8
EIA/TIA-232
INPUTS
*
GND
15
ADM202E
00066-004
GND
15
ADM1181A
00066-005
*
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
*
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 4. ADM202E Typical Operating Circuit
Figure 5. ADM1181A Typical Operating Circuit
Rev. C | Page 5 of 16
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