±15 kV ESD Protected, 3.3 V, RS-232

Line Driver/Receiver

ADM3232E

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

©2006–2011 Analog Devices, Inc. All rights reserved.

FEATURES

Data rate: 460 kbps

2 Tx and 2 Rx

Meets EIA-232E specifications

0.1 μF charge pump capacitors

ESD protection to IEC 1000-4-2 (801.2) on RS-232 I/Os

Contact discharge: ±8 kV

Air gap discharge: ±15 kV

APPLICATIONS

General-purpose RS-232 data link

Portable instruments

Handsets

Industrial/telecom diagnostic ports

FUNCTIONAL BLOCK DIAGRAM

C1+

C2+

C1–

C2–

V–

V+

TTL/CMOS

INPUTS

RS-232

OUTPUTS

TTL/CMOS

OUTPUTS

RS-232

INPUTS*

T1

T2

R1

R2

+

+

C1

0.1µF

10V

C2

0.1µF

10V

GND

ADM3232E

C3

0.1µF

6.3V

+3.3V INPUT

+3.3V TO +6.6V

VOLTAGE

DOUBLER

+6.6V TO –6.6V

VOLTAGE

INVERTER

C5

0.1µF

C4

0.1µF

10V

*INTERNAL 5kΩ PULL-DOWN RESISTOR

ON EACH RS-232 INPUT.

5kΩ

5kΩ

Figure 1.

GENERAL DESCRIPTION

The ADM3232E transceiver is a high speed, 2-channel RS-232/V.28

interface device that operates from a single 3.3 V power supply.

Low power consumption makes it ideal for battery-powered

portable instruments. The ADM3232E conforms to the EIA-232E

and ITU-T V.28 specifications and operates at data rates up to

460 kbps.

against electrostatic discharges (up to ±15 kV ESD protection).

This ensures compliance with IEC 1000-4-2 requirements.

This device is ideally suited for operation in electrically harsh

environments or where RS-232 cables are frequently plugged/

unplugged, with the ±15 kV ESD protection of the ADM3232E

RS-232 input/output pins.

Emissions are also controlled to within very strict limits. CMOS

technology is used to keep the power dissipation to an absolute

minimum, allowing maximum battery life in portable applications.

Four external 0.1 μF charge pump capacitors are used for the

voltage doubler/inverter, permitting operation from a single

3.3 V supply.

The ADM3232E is available in a 16-lead narrow and wide SOIC

packages, as well as a space-saving 16-lead TSSOP.