Datasheet

REV. A
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a
ADM101E
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2001
Craft Port
TM
Tiny RS-232 Transceiver for
Portable Applications
FUNCTIONAL BLOCK DIAGRAM
V
CC
GND
V–
SD
T
IN
1
2
3
4
10
9
8
7
C1–
C1+
T
OUT
5
6
R
OUT
R
IN
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 A I
CC
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
applications 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.