Datasheet

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Craft Port™ Tiny RS-232 Transceiver for

Portable Applications

Data Sheet

ADM101E

FEATURES

460 kbit/s Transmission Rate

Single 5 V Power Supply

Compatible with RS-232 Input/Output Levels

0.1 μF 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 μA I

Ultralow Power (1 μA) Shutdown Mode

10-Lead MSOP Package

Qualified for Automotive Applications

APPLICATIONS

Mobile Telephones

Palmtop Computers

PDAs

Portable Instrumentation

GPS Receivers

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

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

consumption is typically less than 1 μA. The transmitter is

disabled during shutdown but the receiver remains functional.

An epitaxial BiCMOS construction minimizes power consumption

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 MSOP 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 compact

size and low power drain are paramount.

Craft Port is a trademark of Analog Devices, Inc.

Rev. B Document Feedback

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

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

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

Trademarks and registered trademarks are the property of their respective owners.

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Summary of content (12 pages)

PAGE 1
Craft Port™ Tiny RS-232 Transceiver for Portable Applications ADM101E Data Sheet FUNCTIONAL BLOCK DIAGRAM FEATURES 460 kbit/s Transmission Rate Single 5 V Power Supply Compatible with RS-232 Input/Output Levels 0.1 μF 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 μA ICC Ultralow Power (1 μA) Shutdown Mode 10-Lead MSOP Package Qualified for Automotive Applications APPLICATIONS Figure 1.
PAGE 2
ADM101E Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 General Description ..........................................................................8 Applications ....................................................................................... 1 Circuit Description............................................................................9 Functional Block Diagram ..........................................
PAGE 3
Data Sheet ADM101E SPECIFICATIONS VCC = 5 V ± 10%, C1 = C2 = 0.1 μF. All specifications TMIN to TMAX unless otherwise noted. Table 1.
PAGE 4
ADM101E Data Sheet ABSOLUTE MAXIMUM RATINGS TA = 25°C unless otherwise noted. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2.
PAGE 5
Data Sheet ADM101E PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 2. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 Mnemonic GND C1− V− TIN ROUT RIN TOUT SD C1+ VCC Function Ground Pin. Must be connected to 0 V. Negative Terminal of C1 (if C1 is Polarized Capacitor). Internally Generated Negative Supply Voltage. Driver Input (3 V to 5 V TTL/CMOS Logic Levels). Receiver Output (3 V to 5 V TTL/CMOS Logic Levels). Receiver Input (EIA-232 Signal Levels).
PAGE 6
ADM101E Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS Figure 3. Charge Pump Voltage vs. Current Figure 5. Transmitter Output Voltage vs. Load Capacitance at 460 kbps Figure 4. IDD vs. Load Capacitance at 460 kbps Figure 6. Tx Output Voltage vs. Supply Rev. B | Page 6 of 12 Downloaded from Arrow.com.
PAGE 7
Data Sheet ADM101E Figure 7. Slew Rate vs. Data Rate Figure 8. Transmitter Output Voltage vs. Load Current Rev. B | Page 7 of 12 Downloaded from Arrow.com.
PAGE 8
ADM101E Data Sheet GENERAL DESCRIPTION The ADM101E is an RS-232 compatible line driver/receiver in the Analog Devices Craft Port series, containing one driver (transmitter) and one receiver. It is ideal for serial communication in small portable devices such as mobile telephones, palmtop personal computers and personal digital assistants, where a full, RS-232 serial interface is not required, and only Tx and Rx lines are required for low speed communication between devices.
PAGE 9
Data Sheet ADM101E CIRCUIT DESCRIPTION The internal circuitry consists of three main sections. These are: 1. A charge pump dc-to-dc converter. 2. 5 V logic to EIA-232 driver. 3. EIA-232 to 5 V logic receiver. CHARGE PUMP DC-DC CONVERTER The dc-dc converter generates a negative supply voltage from the 5 V supply, thus removing the need for a separate −5 V rail. It consists of an on-chip 200 kHz oscillator, switching matrix and two external capacitors, as shown in Figure 9.
PAGE 10
ADM101E Data Sheet SHUTDOWN INPUT The shutdown input allows the ADM101E to be put into an ultralow power mode where the dc-dc converter is switched off and the transmitter is disabled. The receiver remains active during shutdown. Logic 0 at this input enables the ADM101E, while a Logic 1 at this input shuts down the ADM101E. Rev. B | Page 10 of 12 Downloaded from Arrow.com.
PAGE 11
Data Sheet ADM101E OUTLINE DIMENSIONS 3.10 3.00 2.90 10 3.10 3.00 2.90 5.15 4.90 4.65 6 1 5 PIN 1 IDENTIFIER 0.50 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.30 0.15 6° 0° 0.23 0.13 0.70 0.55 0.40 COMPLIANT TO JEDEC STANDARDS MO-187-BA 091709-A 0.15 0.05 COPLANARITY 0.10 Figure 10.
PAGE 12
ADM101E Data Sheet NOTES ©2001–2014 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00053-0-3/14(B) Rev. B | Page 12 of 12 Downloaded from Arrow.com.