MAX1479ATE ,300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK TransmitterFeaturesThe MAX1479 crystal-referenced phase-locked-loop♦ ETSI-Compliant EN300 220(PLL) VHF/UHF tra ..
MAX1479ATE ,300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK TransmitterApplicationsPART TEMP RANGE PIN-PACKAGERemote Keyless EntryMAX1479ATE -40°C to +125°C 16 Thin QFN-E ..
MAX1479ATE+ ,300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK TransmitterApplicationsMAX1479ATE+ -40°C to +125°C 16 TQFN-EP*● Remote Keyless Entry+Denotes a lead(Pb)-free/R ..
MAX147BCAP ,+2.7Low-Power, 8-Channel, Serial 12-Bit ADCsApplications+3VPortable Data Logging Data AcquisitionVCH0 V DDDD 0.1μFMedical Instruments Battery- ..
MAX147BCAP+ ,+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCsELECTRICAL CHARACTERISTICS(V = +2.7V to +3.6V (MAX146); V = +2.7V to +5.25V (MAX147); COM = 0; f = ..
MAX147BCAP+ ,+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCsMAX146/MAX14719-0465; Rev 2; 10/01+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs
MAX4053CSE ,Low-Voltage / CMOS Analog Multiplexers/SwitchesGeneral Description ________
MAX4053CSE ,Low-Voltage / CMOS Analog Multiplexers/SwitchesFeaturesThe MAX4051/MAX4052/MAX4053 and MAX4051A/' Pin Compatible with Industry-Standard MAX4052A/M ..
MAX4053CSE ,Low-Voltage / CMOS Analog Multiplexers/SwitchesFeaturesThe MAX4051/MAX4052/MAX4053 and MAX4051A/' Pin Compatible with Industry-Standard MAX4052A/M ..
MAX4053CSE ,Low-Voltage / CMOS Analog Multiplexers/SwitchesGeneral Description ________
MAX4053CSE+ ,Low-Voltage, CMOS Analog Multiplexers/SwitchesMAX4051/A, MAX4052/A, MAX4053/A19-0463; Rev 2; 10/05Low-Voltage, CMOS AnalogMultiplexers/Switches
MAX4053CSE+T ,Low-Voltage, CMOS Analog Multiplexers/SwitchesMAX4051/A, MAX4052/A, MAX4053/A19-0463; Rev 2; 10/05Low-Voltage, CMOS AnalogMultiplexers/Switches
MAX1479ATE
300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter
General DescriptionThe MAX1479 crystal-referenced phase-locked-loop
(PLL) VHF/UHF transmitter is designed to transmit ASK,
OOK, and FSK data in the 300MHz to 450MHz frequency
range. The MAX1479 supports data rates up to 100kbps
in ASK mode and 20kbps in FSK mode (both
Manchester coded). The device provides an adjustable
output power of more than +10dBm into a 50Ωload. The
crystal-based architecture of the MAX1479 eliminates
many of the common problems of SAW-based transmit-
ters by providing greater modulation depth, faster fre-
quency settling, higher tolerance of the transmit
frequency, and reduced temperature dependence.
These improvements enable better overall receiver per-
formance when using the MAX1479 together with a
superheterodyne receiver such as the MAX1470,
MAX1471, MAX1473, or MAX7033.
The MAX1479 is available in a 16-pin thin QFN pack-
age (3mm x 3mm) and is specified for the automotive
temperature range from -40°C to +125°C.
ApplicationsRemote Keyless Entry
Tire Pressure Monitoring
Security Systems
Radio-Controlled Toys
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
RF Remote Controls
Garage Door Openers
FeaturesETSI-Compliant EN300 220+2.1V to +3.6V Single-Supply OperationSupports ASK, OOK, and FSK ModulationsAdjustable FSK Shift+10dBm Output Power into 50ΩLoadLow Supply Current (6.7mA in ASK Mode,
and 10.5mA in FSK Mode)Uses Small Low-Cost CrystalSmall 16-Pin Thin QFN PackageFast-On Oscillator—200µs Startup TimeProgrammable Clock Output
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Pin Configuration
Ordering Information
Functional Diagram19-3353; Rev 0; 8/04
*EP = Exposed paddle.
Typical Application Circuit appears at end of data sheet.
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, VDD= +2.1V to +3.6V, VENABLE= VDD, TA= -40°C to
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.
VDDto GND.............................................................-0.3V to +4V
All Other Pins to GND ................................-0.3V to (VDD+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
16-Pin Thin QFN (derate 14.7mW/°C above +70°C)...1176.5mW
Operating Temperature Range.........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-60°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Note 2:100% tested at TA= +125°C. Guaranteed by design and characterization over temperature.
Note 3:50% duty cycle at 10kHz ASK data (Manchester coded).
Note 4:Guaranteed by design and characterization, not production tested.
Note 5:VENABLE= VILto VENABLE= VIH. fOFFSETis defined as the frequency deviation from the desired carrier frequency.
Note 6:Dependent on crystal and PC board trace capacitance.
Note 7:VENABLE> VIH, VDATA> VIH, Efficiency = POUT/ (VDDx IDD).
Note 8:Dependent on PC board trace capacitance.
AC ELECTRICAL CHARACTERISTICS(Typical Application Circuit, all RF inputs and outputs are referenced to 50Ω, VDD= +2.1V to +3.6V, VENABLE= VDD, TA= -40°C to
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Typical Operating Characteristics(Typical Application Circuit, VDD= +2.7V, TA = +25°C, unless otherwise noted.)
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitterypical Operating Characteristics (continued)(Typical Application Circuit, VDD= +2.7V, TA = +25°C, unless otherwise noted.)
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Detailed DescriptionThe MAX1479 is a highly integrated ASK/FSK transmit-
ter operating over the 300MHz to 450MHz frequency
band. The device requires only a few external compo-
nents to complete a transmitter solution. The MAX1479
includes a complete PLL and a highly efficient power
amplifier. The device can be set into a 0.2nA low-power
shutdown mode.
Shutdown ModeENABLE (pin 4) is internally pulled down with a 20µA
current source. If it is left unconnected or pulled low,
the MAX1479 goes into a low-power shutdown mode.
In this mode, the supply current drops to 0.2nA. When
ENABLE is high, the device is enabled and is ready for
transmission after 200µs (frequency settles to within
50kHz).
The 200µs turn-on time of the MAX1479 is mostly domi-
nated by the crystal oscillator startup time. Once the
oscillator is running, the 300kHz PLL bandwidth allows
fast frequency recovery during power-amplifier toggling.
Mode SelectionMODE (pin 2) sets the MAX1479 in either ASK or FSK
mode. When MODE is set low, the device operates as
an ASK transmitter. If MODE is set high, the device
operates as an FSK transmitter. In the ASK mode, the
DIN pin controls the output of the power amplifier. A
logic low on DIN turns off the PA, and a logic high turns
on the PA. In the FSK mode, a logic low on the DIN pin
is represented by the low FSK frequency, and a logic-
high input is represented by the high FSK frequency.
(The ASK carrier frequency and the lower FSK frequen-
cy are the same.) The deviation is proportional to the
crystal load impedance and pulling capacitance. The
maximum frequency deviation is 55kHz for fRF=
315MHz and 80kHz for fRF= 433MHz.
