High Speed, 5 V, 0.1 µF
CMOS RS-232 Driver/Receiver
ADM202
Data Sheet
FEATURES
TYPICAL APPLICATION CIRCUIT
5V INPUT
120 kB transmission rate
Small (0.1 µF) charge pump capacitors
Single 5 V power supply
Meets TIA/EIA-232-E and V.28 specifications
2 drivers and 2 receivers
On-board dc-to-dc converters
9 V output swing with 5 V supply
Low power BiCMOS: 2.5 mA ICC
30 V receiver input levels
+
0.1µF
6.3V
V
16
2
1
3
C1+
C1–
CC
+5V TO +10V
VOLTAGE
DOUBLER
+
+
0.1µF
6.3V
0.1µF
6.3V
+
+
V+
V–
4
5
C2+
C2–
+10V TO –10V
VOLTAGE
INVERTER
0.1µF
16V
6
0.1µF
16V
T1
T1
11
10
12
9
14
7
T1
T2
R1
R2
IN
OUT
TTL/CMOS
RS-232
OUTPUTS
1
INPUTS
T2
IN
T2
OUT
APPLICATIONS
R1
13
8
R1
IN
OUT
OUT
Computers
Peripherals
Modems
TTL/CMOS
OUTPUTS
RS-232
INPUTS
2
R2
R2
IN
GND
15
ADM202
Printers
Instruments
1
2
INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
Figure 1.
GENERAL DESCRIPTION
The ADM202 is a 2-channel RS-232 line driver/receiver pair
designed to operate from a single 5 V power supply. A highly
efficient on-chip charge pump design permits RS-232 levels to
be developed using charge pump capacitors as small as 0.1 µF.
This converter generates 10 V RS-232 output levels.
An epitaxial BiCMOS construction minimizes power consump-
tion to 10 mW and guards against latch-up. Overvoltage
protection is provided, allowing the receiver inputs to withstand
continuous voltages in excess of 30 V. In addition, all pins
contain ESD protection to levels greater than 2 kV.
The ADM202 meets or exceeds the TIA/EIA-232-E and V. 28
specifications. Fast driver slew rates permit 120 kB operation,
and high drive currents allow extended cable lengths.
The ADM202 is available in a 16-lead PDIP and both narrow
and wide 16-lead SOIC packages.
Rev. B
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