EMI/EMC-Compliant, ±15 kV, ESD-Protected
RS-232 Line Drivers/Receivers
ADM202E/ADM1181A
FEATURES
5V INPUT
0.1µF
10V
0.1µF
10V
C2+
C1–
C2–
+5V TO +10V V
CC
VOLTAGE
V+
DOUBLER
+10V TO –10V V–
VOLTAGE
INVERTER
C3
0.1µF
6.3V
T1
T1OUT
T2IN
T2
T2OUT
R1OUT
R1
R1IN
R2OUT
CMOS
OUTPUTS
C5
0.1µF
C4
0.1µF
10V
T1IN
CMOS
INPUTS
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
PDAs
C1+
R2
R2IN
EIA/TIA-232
OUTPUTS
EIA/TIA-232
INPUTS*
ADM202E
GND
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
00066-001
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
Figure 1.
5V INPUT
+5V TO +10V V
CC
VOLTAGE
V+
DOUBLER
0.1µF
10V
0.1µF
10V
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.
C2+ +10V TO –10V V–
VOLTAGE
C2–
INVERTER
C1–
C4
0.1µF
10V
T1IN
CMOS
INPUTS
T1
T1OUT
T2IN
T2
T2OUT
R1OUT
R1
R2OUT
CMOS
OUTPUTS
R2
GND
C5
0.1µF
C3
10V
0.1µF
10V
EIA/TIA-232
OUTPUTS
R1IN
R2IN
EIA/TIA-232
INPUTS*
ADM1181A
*INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
00066-002
GENERAL DESCRIPTION
C1+
Figure 2.
The ADM202E and ADM1181A conform to the EIA-232E
and CCITT V.28 specifications and operate at data rates up
to 230 kbps.
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.
Four external 0.1 µF charge-pump capacitors are used for the
voltage doubler/inverter, permitting operation from a single
5 V supply.
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
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