MAX1472AKA+T Maxim Integrated Products, MAX1472AKA+T Datasheet

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MAX1472AKA+T

Manufacturer Part Number
MAX1472AKA+T
Description
RF Transmitter IC TRANSMITTER ASK -Power Crystal-Based
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1472AKAT.pdf (9 pages)

Specifications of MAX1472AKA+T

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
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.
19-2872; Rev 3; 10/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
* Optional power adjust resistor.
ANTENNA
50Ω
Remote Keyless Entry
RF Remote Controls
Tire Pressure Monitoring
Security Systems
Radio-Controlled Toys
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
220pF
Typical Application Circuit
680pF
________________________________________________________________ Maxim Integrated Products
*
General Description
1
2
4
3
PAGND
PAOUT
+
XTAL1
GND
MAX1472
Applications
ENABLE
XTAL2
DATA
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
V
DD
5
6
8
7
STANDBY OR
DATA INPUT
POWER-UP
3.0V
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
o Fast-On Oscillator 220µs Startup Time
* At 50% duty cycle (315MHz, 2.7V supply, +10dBm output
power)
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX1472AKA+T
TOP VIEW
PART
PAGND
PAOUT
XTAL1
GND

3mm 8-Pin SOT23 Package
1
2
4
-40°C to +125°C
3
+
Ordering Information
RANGE
TEMP
MAX1472
SOT23
Pin Configuration
6
8
7
5
PIN-
PACKAGE
8 SOT23
XTAL2
V
DATA
ENABLE
DD
Features
MARK
AEKS
TOP
1

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MAX1472AKA+T Summary of contents

Page 1

... Supports ASK with 90dB Modulation Depth o Output Power Adjustable to More than +10dBm o Uses Small Low-Cost Crystal o Small 3mm o Fast-On Oscillator 220µs Startup Time * At 50% duty cycle (315MHz, 2.7V supply, +10dBm output power) PART MAX1472AKA+T + Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. TOP VIEW XTAL2 8 3.0V V ...

Page 2

Low-Power, Crystal-Based ASK Transmitter ABSOLUTE MAXIMUM RATINGS V to GND ..........................................................-0.3V to +4.0V DD All Other Pins to GND ................................-0. Continuous Power Dissipation (T = +70°C) A 8-Pin SOT23 (derate 8.9mW/°C above +70°C)............714mW Stresses beyond those listed ...

Page 3

ELECTRICAL CHARACTERISTICS (continued) ( Typical Application Circuit , output power is referenced to 50Ω, V otherwise noted. Typical values are at V PARAMETER PHASE-LOCKED LOOP PERFORMANCE VCO Gain Phase Noise Maximum Carrier Harmonics Reference Spur Loop Bandwidth Crystal Frequency Oscillator ...

Page 4

Low-Power, Crystal-Based ASK Transmitter (Typical Application Circuit , V = 2.7V SUPPLY CURRENT vs. SUPPLY VOLTAGE ENABLE DATA IH +25° 315MHz RF 11 -40°C ...

Page 5

Typical Application Circuit , V = 2.7V TRANSMIT POWER EFFICIENCY vs. SUPPLY VOLTAGE 50 +25°C -40° +125°C 35 +85° OUTPUT f = 433MHz RF 25 2.0 2.4 2.8 3.2 3.6 SUPPLY VOLTAGE (V) ...

Page 6

Low-Power, Crystal-Based ASK Transmitter PIN NAME 1 XTAL1 1st Crystal Input GND Ground. Connect to system ground. 3 PAGND Ground for the Power Amplifier (PA). Connect to system ground. Power-Amplifier Output. This output requires a pullup inductor ...

Page 7

Crystal Oscillator The crystal oscillator in the MAX1472 is designed to present a capacitance of approximately 3.1pF between the XTAL1 and XTAL2 pins crystal designed to oscillate with a different load capacitance is used, the crystal is pulled ...

Page 8

Low-Power, Crystal-Based ASK Transmitter Layout Considerations A properly designed PC board is an essential part of any RF/microwave circuit. On the PA output, use con- trolled-impedance lines and keep them as short as possible to minimize losses and radiation. ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2010 Maxim Integrated Products ...

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