MAX7044AKA+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX7044AKA+T
300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter
General Description
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 transmit fre-
quency, 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 microcontroller 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.
Features●+2.1V to +3.6V Single-Supply Operation●OOK/ASK Transmit Data Format●Up to 100kbps Data Rate●+13dBm Output Power into 50Ω Load●Low 7.7mA (typ) Operating Supply Current*●Uses Small, Low-Cost Crystal●Small 3mm x 3mm 8-Pin SOT23 Package●Fast-On Oscillator: 250μs Startup Time
Applications●Remote Keyless Entry (RKE)●Tire-Pressure Monitoring (TPM)●Security Systems●Garage Door Openers●RF Remote Controls●Wireless Game Consoles●Wireless Computer Peripherals●Wireless Sensors
*At 50% duty cycle (315MHz, 2.7V supply, +13dBm output power).
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX7044AKA+T-40°C to +125°C8 SOT23AEJW
MAX7044
XTAL1
ANTENNA
3.0V3.0V
680pF220pF100nF100nF
XTAL2
fXTAL
GNDVDD7
PAGNDDATA INPUT
CLOCK
OUTPUT
(fCLKOUT =
fXTAL/16)
DATA6PAOUTCLKOUT5
DATA
CLKOUTPAOUT
XTAL2
VDDGND
PAGND
XTAL1
SOT23
TOP VIEW
MAX7044
MAX7044300MHz to 450MHz High-Efficiency,
Crystal-Based +13dBm ASK Transmitter
Typical Application CircuitPin Coniguration
Ordering Information
EVALUATION KIT AVAILABLE
VDD to GND .........................................................-0.3V to +4.0V
All Other Pins to GND ..............................-0.3V to (VDD + 0.3V)
Continuous Power Dissipation (TA = +70°C)
8-Pin SOT23 (derate 8.9mW/°C above +70°C) ..........714mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range ............................-60°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, VDD = +2.1V to +3.6V, TA = -40°C to +125°C, unless
otherwise noted. Typical values are at VDD = +2.7V, TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
SYSTEM PERFORMANCE
Supply VoltageVDD2.13.6V
Supply Current
(Note 2)IDD
fRF = 315MHz
VDATA at 50% duty
cycle (Notes 3, 4)7.714.1
PA on (Note 5)13.825.4
PA off (Note 6)1.72.8
fRF = 433MHz
VDATA at 50% duty
cycle (Notes 3, 4)8.014.4
PA on (Note 5)14.025.7
PA off (Note 6)1.93.1
Standby CurrentISTDBY
VDATA < VIL for
more than WAIT
time (Notes 4, 7)
TA < +25°C40130
TA < +125°C5502900
Frequency Range (Note 4)fRF300450MHz
Data Rate (Note 4)0100kbps
Modulation Depth (Note 8)ON to OFF POUT ratio90dB
Output Power, PA On
(Notes 4, 5)POUTfRF = 300MHz to
450MHz
TA = +25°C,
VDD = +2.7V9.612.515.4
dBmTA = +125°C,
VDD = +2.1V5.99.012.0
TA = -40°C,
VDD = +3.6V13.115.818.5
Turn-On TimetONOscillator settled to within 50kHz220µsOscillator settled to within 5kHz450
Transmit Eficiency with CW
(Notes 5, 9)
fRF = 315MHz48%fRF = 433MHz47
Transmit Eficiency with 50% OOK
(Notes 3, 9)
fRF = 315MHz43%fRF = 433MHz41
MAX7044300MHz to 450MHz High-Eficiency,Crystal-Based +13dBm ASK Transmitter
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, VDD = +2.1V to +3.6V, TA = -40°C to +125°C, unless
otherwise noted. Typical values are at VDD = +2.7V, TA = +25°C, unless otherwise noted.) (Note 1)
Note 1: Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
Note 2: Production tested at TA = +25°C with fRF = 300MHz and 450MHz. Guaranteed by design and characterization over tem-
perature and frequency.
Note 3: 50% duty cycle at 10kbps with Manchester coding.
Note 4: Guaranteed by design and characterization, not production tested.
Note 5: PA output is turned on in test mode by VDATA = VDD/2 + 100mV.
Note 6: PA output is turned off in test mode by VDATA = VDD/2 - 100mV.
Note 7: Wait time: tWAIT = (216 x 32)/fRF.
Note 8: Generally limited by PCB layout.
Note 9: VDATA = VIH. Efficiency = POUT/(VDD x IDD).
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
PHASE-LOCKED LOOP (PLL)
VCO Gain330MHz/V
Phase Noise
fRF = 315MHzfOFFSET = 100kHz-84
dBc/HzfOFFSET = 1MHz-91
fRF = 433MHzfOFFSET = 100kHz-82
fOFFSET = 1MHz-89
Maximum Carrier HarmonicsfRF = 315MHz-50dBcfRF = 433MHz-50
Reference SpurfRF = 315MHz-74dBcfRF = 433MHz-80
Loop Bandwidth1.6MHz
Crystal FrequencyfXTALfRF/32MHz
Frequency Pulling by VDD3ppm/V
Crystal Load Capacitance3pF
DATA INPUT
Data Input HighVIHVDD -
0.25V
Data Input LowVIL0.25V
Maximum Input Current10µA
Pulldown Current10µA
CLKOUT OUTPUT
Output Voltage LowVOLISINK = 650µA (Note 4)0.25V
Output Voltage HighVOHISOURCE = 350µA (Note 4)VDD -
0.25V
Load CapacitanceCLOAD(Note 4)10pF
CLKOUT FrequencyfXTAL/16Hz
MAX7044300MHz to 450MHz High-Eficiency,Crystal-Based +13dBm ASK Transmitter
Electrical Characteristics (continued)
(Typical Application Circuit, VDD = +2.7V, TA = +25°C, unless otherwise noted.) (Note 1)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7044 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +25°C
fRF = 315MHz
PA 50% DUTY CYCLE AT 10kHz
TA = -40°C
TA = +85°C
TA = +125°C
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7044 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +25°C
fRF = 433MHz
PA ON
TA = -40°C
TA = +85°C
TA = +125°C
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7044 toc04
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
TA = +25°C
fRF = 433MHz
PA 50% DUTY CYCLE AT 10kHz
TA = -40°C
TA = +85°C
TA = +125°C
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX7044 toc05
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
fRF = 315MHz
PA ON
TA = +25°C
TA = -40°C
TA = +85°C
TA = +125°C
OUTPUT POWER
vs. SUPPLY VOLTAGE
MAX7044 toc06
SUPPLY VOLTAGE (V)
OUTPUT POWER (dBm)
fRF = 433MHz
PA ON
TA = +25°C
TA = -40°C
TA = +85°C
TA = +125°C
REFERENCE SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
MAX7044 toc07
REFERENCE SPUR MAGNITUDE (dBc)
REFERENCE SPUR = fRF fXTAL
fRF = 433MHz
fRF = 315MHz
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX7044 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
fRF = 315MHz
PA ON
TA = -40°C
TA = +25°C
TA = +85°C
TA = +125°C
FREQUENCY STABILITY
vs. SUPPLY VOLTAGE
MAX7044 toc08
FREQUENCY STABILITY (ppm)
fRF = 433MHz
fRF = 315MHz
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7044 toc09
TRANSMIT POWER EFFICIENCY (%)
fRF = 315MHz
PA ON
TA = -40°C
TA = +85°C
TA = +125°C
TA = +25°C
MAX7044300MHz to 450MHz High-Eficiency,Crystal-Based +13dBm ASK Transmitter
Typical Operating Characteristics
(Typical Application Circuit, VDD = +2.7V, TA = +25°C, unless otherwise noted.) (Note 1)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7044 toc10
SUPPLY VOLTAGE (V)
TRANSMIT POWER EFFICIENCY (%)
fRF = 315MHz
PA 50% DUTY CYCLE AT 10kHz
TA = -40°C
TA = +85°C
TA = +125°C
TA = +25°C
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7044 toc11
SUPPLY VOLTAGE (V)
TRANSMIT POWER EFFICIENCY (%)
fRF = 433MHz
PA ONTA = -40°C
TA = +85°C
TA = +125°C
TA = +25°C
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7044 toc12
SUPPLY VOLTAGE (V)
TRANSMIT POWER EFFICIENCY (%)
fRF = 433MHz
PA 50% DUTY CYCLE AT 10kHz TA = +25°C
TA = -40°C
TA = +85°C
TA = +125°C
PHASE NOISE vs. OFFSET FREQUENCY
MAX7044 toc13
OFFSET FREQUENCY (kHz)
PHASE NOISE (dBc/Hz)110100100010,000
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
MAX7044 toc14
EXTERNAL RESISTOR (Ω)
SUPPLY CURRENT (mA)
POWER
CURRENT
fRF = 315MHz
PA ON
OUTPUT POWER (dBm)
SUPPLY CURRENT vs. OUTPUT POWER
MAX7044 toc15
OUTPUT POWER (dBm)
SUPPLY CURRENT (mA)
fRF = 315MHz
PA ON
50% DUTY CYCLE
50kHz/
div
FREQUENCY SETTLING TIME
MAX7044 toc16
AM DEMODULATION OF PA OUTPUT
DATA RATE = 100kHz
MAX7044 toc17
5dB/
div
OUTPUT SPECTRUM
MAX7044 toc18
10dB/
div
0dB
fRF = 315MHz
MAX7044300MHz to 450MHz High-Eficiency,Crystal-Based +13dBm ASK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, VDD = +2.7V, TA = +25°C, unless otherwise noted.) (Note 1)
Detailed Description
The MAX7044 is a highly integrated ASK transmitter oper-
ating over the 300MHz to 450MHz frequency band. The
IC requires only a few external components to complete transmit solution. The MAX7044 includes a complete
PLL and a highly efficient power amplifier. The device is
automatically placed into a low-power shutdown mode
and powers up when data is detected on the data input.
Shutdown Mode
The MAX7044 has an automatic shutdown mode that
places the device in low-power mode if the DATA input
has not toggled for a specific amount of time (wait time).
PINNAMEFUNCTIONXTAL11st Crystal Input. fXTAL = fRF/32.GNDGround. Connect to system ground.PAGNDGround for the Power Ampliier (PA). Connect to system ground.PAOUTPower-Ampliier Output. The PA output requires a pullup inductor to the supply voltage, which can be
part of the output-matching network to an antenna.CLKOUTBuffered Clock Output. The frequency of CLKOUT is fXTAL/16.DATAOOK Data Input. DATA also controls the power-up state. See the Shutdown Mode section.VDDSupply Voltage. Bypass to GND with a 100nF capacitor as close as possible to the pin.XTAL22nd Crystal Input. fXTAL = fRF/32.
CLKOUT SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
MAX7044 toc19
SUPPLY VOLTAGE (V)
CLKOUT SPUR MAGNITUDE (dBc)
fRF = 315MHz
CLKOUT
PAGND
PAOUT
GND
DATA
XTAL1/16
DATA
ACTIVITY
DETECTOR
LOCK DETECT32x PLL
CRYSTAL-
OSCILLATOR
DRIVERXTAL2
VDDMAX7044
MAX7044300MHz to 450MHz High-Eficiency,Crystal-Based +13dBm ASK Transmitter
Pin Description
Functional Diagram
Typical Operating Characteristics (continued)

Partno	Mfg	Dc	Qty	Available	Descript
MAX7044AKA+T	MAXIM	N/a	500	avai	300MHz to 450MHz High-Efficiency, Crystal-Based +13dBm ASK Transmitter