REV. 0
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a
EMI/EMC Compliant, 615 kV ESD Protected,
RS-232 Line Drivers/Receivers
ADM202E/ADM1181A
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
FUNCTIONAL BLOCK DIAGRAMS
C1+
C1–
C2+
C2–
V
CC0.1µF
10V
0.1µF
10V
V+
V–
+5V TO +10V
VOLTAGE
DOUBLER
3
1
2
+5V INPUT
C3
0.1µF
10V
4
5
+10V TO –10V
VOLTAGE
INVERTER
6
C4
0.1µF
10V
1411
T1
OUT
T1
IN
16
C5
0.1µF
10V
710
T2
OUT
T2
IN
12 13
89
ADM1181A
R1
OUT
R2
OUT
R1
IN
R2
IN
CMOS
INPUTS
CMOS
OUTPUTS
EIA/TIA-232
OUTPUTS
EIA/TIA-232
INPUTS*
15
NOTE
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
GND
C1+
C1–
C2+
C2–
V
CC0.1µF
10V
0.1µF
10V
V+
V–
+5V TO +10V
VOLTAGE
DOUBLER
3
1
2
+5V INPUT
C3
0.1µF
6.3V
4
5
+10V TO –10V
VOLTAGE
INVERTER
6
C4
0.1µF
10V
1411
T1
OUT
T1
IN
16
C5
0.1µF
710
T2
OUT
T2
IN
12 13
89
ADM202E
R1
OUT
R2
OUT
R1
IN
R2
IN
CMOS
INPUTS
CMOS
OUTPUTS
EIA/TIA-232
OUTPUTS
EIA/TIA-232
INPUTS*
15
NOTE
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
GND
T1
T2
R1
R2
T1
T2
R1
R2
GENERAL DESCRIPTION
The ADM202E and ADM1181A are robust, high speed, 2-
channel RS232/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 di-
rective on EMC (89/336/EEC). Both the level of electromag-
netic 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 Im-
munity (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.
The ADM202E provides a robust pin-compatible upgrade for
existing ADM202, ADM232L or MAX202E/MAX232E sock-
ets. It is available in a 16-pin DIP, wide and narrow SO and also
a space saving TSSOP package. The TSSOP package gives a
44% space saving over SOIC.
The ADM1181A provides a robust pin compatible upgrade for
the LTC1181A, and it is available in 16-pin DIP and 16-lead
SO packages.
FEATURES
Complies with 89/336/EEC EMC Directive
ESD Protection to IEC1000-4-2 (801.2)
68 kV: Contact Discharge
615 kV: Air-Gap Discharge
615 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
APPLICATIONS
General Purpose RS-232 Data Link
Portable Instruments
PDAs
ORDERING GUIDE
Model Temperature Range Package Option
ADM202EAN –40°C to +85°C N-16
ADM202EARW –40°C to +85°C R-16W
ADM202EARN –40°C to +85°C R-16N
ADM202EARU –40°C to +85°C RU-16
ADM1181AAN –40°C to +85°C N-16
ADM1181AARW –40°C to +85°C R-16W