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
T1IN
C1+
C1–
4
C2+
5
0.1µF +
16V
1
3
0.1µF +
6.3V
C2–
+5V TO +10V
VOLTAGE
DOUBLER
+10V TO –10V
VOLTAGE
INVERTER
VCC 16
V+ 2
0.1µF
+ 16V
14
T1OUT
7
T2OUT
RS-232
OUTPUTS
TTL/CMOS
INPUTS1
T2IN
12
R1
13
R1IN
R2OUT
Computers
Peripherals
Modems
Printers
Instruments
10
R1OUT
APPLICATIONS
+ 0.1µF
6.3V
V– 6
T1
11
0.1µF
+ 6.3V
9
R2
8
R2IN
T2
RS-232
INPUTS2
TTL/CMOS
OUTPUTS
GND
ADM202
1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.
2INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.
00065-001
15
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 consumption 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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