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ADM202

High Speed, 5 V, 0.1 µF CMOS RS-232 Driver/Receiver

Analog Devices 

Data Sheet

FEATURES

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

APPLICATIONS

Computers

Peripherals

Modems

Printers

Instruments

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.

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.

High Speed, 5 V, 0.1 µF

CMOS RS-232 Driver/Receiver

ADM202

TYPICAL APPLICATION CIRCUIT

5V INPUT

0.1µF +

6.3V

1 C1+

3 C1–

+5V TO +10V

VOLTAGE

DOUBLER

VCC 16

V+ 2

0.1µF

+ 6.3V

+ 0.1µF

6.3V

0.1µF +

16V

TTL/CMOS

INPUTS1

T1IN

T2IN

4 C2+

5 C2–

+10V TO –10V

VOLTAGE

INVERTER

11

T1

10

T2

V– 6

14

7

0.1µF

+ 16V

T1OUT

T2OUT

RS-232

OUTPUTS

TTL/CMOS

OUTPUTS

R1OUT

R2OUT

12

R1

13

9

GND

15

R2

8

ADM202

R1IN

R2IN

RS-232

INPUTS2

1INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.

2INTERNAL 5kΩ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.

Figure 1.

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 is available in a 16-lead PDIP and both narrow

and wide 16-lead SOIC packages.

Rev. B

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