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General Description

The MAX3120 IrDA 1.2-compatible infrared transceiver

is optimized for battery-powered, space-constrained

applications. It consumes only 120µA while supporting

data rates up to 115kbps over a wide 3V to 5.5V oper-

ating range, and features a 10nA shutdown mode to

further extend battery life.

The MAX3120 reduces the space required for IrDA

applications by requiring a minimum of external compo-

nents: photodiode, infrared LED, and current-setting

resistor. Optical components are external to allow maxi-

mum flexibility in PC board design. The MAX3120 is

available in 8-pin µMAX and SO packages. The µMAX

package consumes half the board space of an 8-pin

SO.

Applications

IrDA Applications

Personal Digital Assistants (PDAs)

Palmtop Computers

Cell Phones

Hand-Held Equipment

Peripherals

Features

o IrDA 1.2 Compatible: 2.4kbps to 115.2kbps

o +3V to +5.5V Single-Supply Operation

o Flexible Optics Selection and Layout

o 120µA Supply Current

o 10nA Shutdown Supply Current

o 200mA, High-Current Infrared LED Drive

Low-Profile, 3V, 120µA,

IrDA Infrared Transceiver

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Maxim Integrated Products

1

1

2

3

4

8

7

6

5

RXD

LEDC

PGND

SHDN

PINC

GND

TXD

MAX3120

µMAX/SO

TOP VIEW

19-1390; Rev 0; 10/98

PART

MAX3120CUA

MAX3120CSA

MAX3120EUA

-40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

8 µMAX

8 SO

8 µMAX

Pin Configuration

Ordering Information

MAX3120ESA

-40°C to +85°C

8 SO

MAX3120

RXD

PINC

LEDC

TXD

+3.3V

SHDN

GND

PGND

MAX3100

CS

SCLK

DIN

DOUT

RX

TX

GND

PIN

DIODE

LED

Typical Operating Circuit