MAX7044AKA+T Maxim Integrated Products, MAX7044AKA+T Datasheet

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MAX7044AKA+T

Manufacturer Part Number
MAX7044AKA+T
Description
RF Transmitter IC TRANSMITTER ASK -Power, High Efficie
Manufacturer
Maxim Integrated Products
Type
Transmitterr
Datasheet
1.MAX7044AKAT.pdf (10 pages)

Specifications of MAX7044AKA+T

Operating Frequency
450 MHz
Mounting Style
SMD/SMT
Operating Supply Voltage
2.5 V, 3.3 V
Package / Case
SOT-23-8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX7044 crystal-referenced phase-locked-loop
(PLL) VHF/UHF transmitter is designed to transmit
OOK/ASK data in the 300MHz to 450MHz frequency
range. The MAX7044 supports data rates up to 100kbps,
and provides output power up to +13dBm into a 50Ω
load while only drawing 7.7mA at 2.7V.
The crystal-based architecture of the MAX7044 elimi-
nates many of the common problems with SAW-based
transmitters by providing greater modulation depth,
faster frequency settling, higher tolerance of the trans-
mit frequency, and reduced temperature dependence.
The MAX7044 also features a low supply voltage of
+2.1V to +3.6V. These improvements enable better
overall receiver performance when using the MAX7044
together with a superheterodyne receiver such as the
MAX1470 or MAX1473.
A simple, single-input data interface and a buffered
clock-out signal at 1/16th the crystal frequency make
the MAX7044 compatible with almost any microcon-
troller or code-hopping generator.
The MAX7044 is available in an 8-pin SOT23 package
and is specified over the -40°C to +125°C automotive
temperature range.
19-3221; Rev 4; 2/11
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.
100nF
ANTENNA
Remote Keyless Entry (RKE)
Tire-Pressure Monitoring (TPM)
Security Systems
Garage Door Openers
RF Remote Controls
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
220pF
Typical Application Circuit
________________________________________________________________ Maxim Integrated Products
Crystal-Based +13dBm ASK Transmitter
680pF
General Description
3.0V
1
2
3
4
300MHz to 450MHz High-Efficiency,
XTAL1
GND
PAGND
PAOUT CLKOUT
MAX7044
f
XTAL
Applications
XTAL2
DATA
V
DD
8
7
6
5
3.0V
CLOCK
OUTPUT
(f
f
DATA INPUT
XTAL
CLKOUT
/16)
100nF
=
o +2.1V to +3.6V Single-Supply Operation
o OOK/ASK Transmit Data Format
o Up to 100kbps Data Rate
o +13dBm Output Power into 50Ω Load
o Low 7.7mA (typ) Operating Supply Current*
o Uses Small, Low-Cost Crystal
o Small 3mm x 3mm 8-Pin SOT23 Package
o Fast-On Oscillator: 250μs Startup Time
+ Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
MAX7044AKA+T
* At 50% duty cycle (315MHz, 2.7V supply, +13dBm output
power)
PART
TOP VIEW
PAGND
PAOUT
XTAL1
-40°C to +125°C
GND
TEMP RANGE
Ordering Information
1
2
4
3
+
MAX7044
Pin Configuration
SOT23
PIN-
PACKAGE
8 SOT23
8
7
6
5
XTAL2
V
DATA
CLKOUT
Features
DD
TOP MARK
AEJW
1

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MAX7044AKA+T Summary of contents

Page 1

... Low 7.7mA (typ) Operating Supply Current* o Uses Small, Low-Cost Crystal o Small 3mm x 3mm 8-Pin SOT23 Package o Fast-On Oscillator: 250μs Startup Time * At 50% duty cycle (315MHz, 2.7V supply, +13dBm output power) PART Applications MAX7044AKA+T + Denotes a lead(Pb)-free/RoHS-compliant package Tape and reel. TOP VIEW f XTAL 3.0V 8 ...

Page 2

High-Efficiency, Crystal-Based +13dBm 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 Operating ...

Page 3

High-Efficiency, Crystal-Based +13dBm ASK Transmitter ELECTRICAL CHARACTERISTICS (continued) ( Typical Application Circuit , all RF inputs and outputs are referenced to 50Ω, V otherwise noted. Typical values are at V PARAMETER SYMBOL PHASE-LOCKED LOOP (PLL) VCO Gain ...

Page 4

High-Efficiency, Crystal-Based +13dBm ASK Transmitter ( Typical Application Circuit , V = +2.7V SUPPLY CURRENT vs. SUPPLY VOLTAGE 315MHz -40° +25°C ...

Page 5

High-Efficiency, Crystal-Based +13dBm ASK Transmitter ( Typical Application Circuit , V = +2.7V TRANSMIT POWER EFFICIENCY vs. SUPPLY VOLTAGE 315MHz RF PA 50% DUTY CYCLE AT 10kHz +25°C A ...

Page 6

High-Efficiency, Crystal-Based +13dBm ASK Transmitter ( Typical Application Circuit , V = +2.7V PIN NAME 1 XTAL1 1st Crystal Input GND Ground. Connect to system ground. 3 PAGND Ground for the Power Amplifier ...

Page 7

High-Efficiency, Crystal-Based +13dBm ASK Transmitter frequency. For other frequencies, calculate the wait time with the following equation WAIT f RF where t is the wait time to shutdown and f WAIT ...

Page 8

High-Efficiency, Crystal-Based +13dBm ASK Transmitter oscillate with a different load capacitance is used, the crystal is pulled away from its intended operating fre- quency, thus introducing an error in the reference fre- quency. Crystals designed to operate ...

Page 9

High-Efficiency, Crystal-Based +13dBm ASK Transmitter Chip Information PROCESS: CMOS _______________________________________________________________________________________ Package Information For the latest package outline information and land patterns (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates ...

Page 10

... 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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