General Description

The MAX1472 is a crystal-referenced phase-locked

loop (PLL) VHF/UHF transmitter designed to transmit

OOK/ASK data in the 300MHz to 450MHz frequency

range. The MAX1472 supports data rates up to

100kbps, and adjustable output power to more than

+10dBm into a 50

Ω load. The crystal-based architec-

ture of the MAX1472 eliminates many of the common

problems with SAW transmitters by providing greater

modulation depth, faster frequency settling, higher

tolerance of the transmit frequency, and reduced

temperature dependence. Combined, these improve-

ments enable better overall receiver performance when

using a superheterodyne receiver such as the MAX1470

or MAX1473.

The MAX1472 is available in a 3mm x 3mm 8-pin

SOT23 package and is specified for the automotive

(-40°C to +125°C) temperature range. An evaluation kit

is available. Contact Maxim Integrated Products for

more information.

Applications

Remote Keyless Entry

RF Remote Controls

Tire Pressure Monitoring

Security Systems

Radio-Controlled Toys

Wireless Game Consoles

Wireless Computer Peripherals

Wireless Sensors

Features

o 2.1V to 3.6V Single-Supply Operation

o Low 5.3mA Operating Supply Current*

o Supports ASK with 90dB Modulation Depth

o Output Power Adjustable to More than +10dBm

o Uses Small Low-Cost Crystal

o Fast-On Oscillator 220µs Startup Time

*At 50% duty cycle (315MHz, 2.7V supply, +10dBm output

power)

300MHz-to-450MHz Low-Power, Crystal-Based

ASK Transmitter

________________________________________________________________ Maxim Integrated Products

1

DATA

ENABLE

PAOUT

1

2

8

7

XTAL2

GND

PAGND

XTAL1

SOT23

TOP VIEW

3

4

6

5

MAX1472

Pin Configuration

Ordering Information

8

7

6

5

1

2

3

4

DATA

ENABLE

PAOUT

1 3

XTAL2

GND

PAGND

XTAL1

MAX1472

3.0V

DATA INPUT

STANDBY OR

POWER-UP

*

680pF

220pF

50

Ω

ANTENNA

Typical Application Circuit

19-2872; Rev 0; 5/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

MAX1472AKA-T

-40

°C to +125°C

8 SOT23-8

AALM

*Optional power adjust resistor.