19-2872; Rev 0; 5/03
300MHz-to-450MHz Low-Power, Crystal-Based
ASK Transmitter
General Description
Features
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 50Ω 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.
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 Small 3mm ✕ 3mm 8-Pin SOT23 Package
o Fast-On Oscillator 220µs Startup Time
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.
*At 50% duty cycle (315MHz, 2.7V supply, +10dBm output
power)
Applications
Ordering Information
Remote Keyless Entry
RF Remote Controls
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
PART
Tire Pressure Monitoring
Security Systems
MAX1472AKA-T
-40°C to +125°C
8 SOT23-8
AALM
Radio-Controlled Toys
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
Typical Application Circuit
Pin Configuration
TOP VIEW
*
XTAL1
GND
1
2
XTAL2
8
7
3.0V
XTAL1
GND
1
2
3
4
8
7
6
5
XTAL2
MAX1472
V
DD
V
DD
50Ω
ANTENNA
MAX1472
220pF 680pF
DATA
3
4
PAGND
6
5
PAGND
PAOUT
DATA
DATA INPUT
ENABLE
PAOUT
1 3
ENABLE
STANDBY OR
POWER-UP
SOT23
*Optional power adjust resistor.
________________________________________________________________ Maxim Integrated Products
1
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.