EMI/EMC-Compliant, ± ±1 ꢀk, EꢁS-ꢂPotꢃetꢃꢄ
Rꢁ-232 Linꢃ SPivꢃPs/RꢃeꢃivꢃPs
ASM202E/ASM±±8±A
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
5V INPUT
Complies with 89/336/EEC EMC directive
ESD protection to IEC1000-4-2 (801.2)
8 kꢀ: contact discharge
+5V TO +10V
VOLTAGE
DOUBLER
C1+
C1–
V
CC
0.1µF
10V
C3
0.1µF
6.3V
C5
0.1µF
V+
+10V TO –10V
VOLTAGE
INVERTER
C2+
C2–
V–
15 kꢀ: air-gap discharge
15 kꢀ: human body model
0.1µF
10V
C4
0.1µF
10V
EFT fast transient/burst immunity (IEC1000-4-4)
Low EMI emissions (EN55022)
230 kbits/s data rate guaranteed
TSSOP package option
T1
T2
T1
T1
OUT
IN
EIA/TIA-232
OUTPUTS
CMOS
INPUTS
T2
R1
T2
IN
OUT
R1
R2
R1
R2
IN
OUT
OUT
Upgrade for MAX202E, 232E, LT1181A
EIA/TIA-232
CMOS
OUTPUTS
INPUTS
*
R2
IN
APPLICATIONS
General-purpose RS-232 data link
Portable instruments
PDAs
ADM202E
GND
*
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT
Figure 1.
5V INPUT
+5V TO +10V
VOLTAGE
DOUBLER
V
C1+
C1–
0.1µF
10V
CC
C5
0.1µF
10V
V+
V–
C3
0.1µF
10V
+10V TO –10V
VOLTAGE
INVERTER
0.1µF
10V
C2+
C2–
C4
0.1µF
10V
T1
T2
T1
T2
T1
IN
IN
OUT
EIA/TIA-232
OUTPUTS
CMOS
INPUTS
GENERAL DESCRIPTION
T2
R1
R2
OUT
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.
R1
R2
R1
IN
IN
OUT
OUT
EIA/TIA-232
CMOS
OUTPUTS
INPUTS
*
R2
ADM1181A
GND
*
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 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 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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ROCHESTER [ Rochester Electronics ]
