REV. 0

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

ADM101E

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

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1999

Portable Applications

FUNCTIONAL BLOCK DIAGRAM

GND

V–

SD

1

2

3

4

10

9

8

7

C1–

C1+

5

6

R1

T1

+5V TO –5V

VOLTAGE

INVERTER

0.1 F

0.1 F

+5V

0.1 F

+

+

+

ADM101E

FEATURES

460 kbit/s Transmission Rate

Single +5 V Power Supply

Compatible with RS-232 Input/Output Levels

0.1

F Charge Pump Capacitors

One Driver and One Receiver

On-Board DC-DC Converter

4.2 V Output Swing with +5 V Supply

Low Power BiCMOS: 500

Ultralow Power (1

A) Shutdown Mode

10-Lead

SOIC Package

APPLICATIONS

Mobile Telephones

Palmtop Computers

PDAs

Portable Instrumentation

GPS Receivers

GENERAL DESCRIPTION

The ADM101E is a single channel RS-232 driver and receiver in

the Analog Devices Craft Port series, designed to operate from a

single, +5 V supply. A highly efficient charge-pump voltage

inverter generates an on-chip –5 V supply, which eliminates the

need for a negative power supply for the driver and permits

RS-232 compatible output levels to be developed using charge

pump capacitors as small as 0.1

µF.

A shutdown input disables the charge pump and puts the device

into a low power shutdown mode, in which the current con-

sumption is typically less than 1

µA. The transmitter is disabled

during shutdown but the receiver remains functional.

Craft Port is a trademark of Analog Devices, Inc.

An epitaxial BiCMOS construction minimizes power consump-

tion to 3 mW and also guards against latch-up. Overvoltage

protection is provided allowing the receiver inputs to withstand

continuous voltages in excess of

±30 V. In addition, all I-O pins

have ESD protection to levels greater than 15 kV.

The ADM101E is available in a 10-lead

µSOIC package, which

makes it ideal for serial communications in small, portable ap-

plications such as palmtop computers and mobile telephones,

where a full, RS-232 serial interface is not required, but com-

pact size and low power drain are paramount.