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MAX1479ATE+

P1-P3P4-P6P7-P9P10-P10
General Description
The 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 50Ω load. 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 TQFN package
(3mm x 3mm) and is specified for the automotive tem-
perature range from -40°C to +125°C.
Applications
Remote Keyless Entry
Tire Pressure Monitoring
Security Systems
Radio-Controlled Toys
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
RF Remote Controls
Garage Door Openers
Features
o ETSI-Compliant EN300 220
o +2.1V to +3.6V Single-Supply Operation
o Supports ASK, OOK, and FSK Modulations
o Adjustable FSK Shift
o +10dBm Output Power into 50Ω Load
o Low Supply Current (6.7mA in ASK Mode,
and 10.5mA in FSK Mode)
o Uses Small Low-Cost Crystal
o Small 16-Pin TQFN Package
o Fast-On Oscillator—200µs Startup Time
o Programmable Clock Output
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
________________________________________________________________
Maxim Integrated Products
1
16 15 14 13
9
10
11
12
CLK0
CLK1
DEV0
DEV1
TOP VIEW
4
3
2
1
ENABLE
EP*
DIN
MODE
V
DD
5678
V
DD_
PA
CLKOUT
PAOUT
ROUT
MAX1479
GND
XTAL2
XTAL1
DEV2
TQFN
(3mm x 3mm)
*CONNECT EP TO GND.
Pin Configuration
Ordering Information
MAX1479
ENABLE
DIN
MODE
V
DD
CLKOUT
V
DD_
PA
ROUT
PAOUT
CLK0
CLK1
DEV0
DEV1
DEV2
XTAL1
XTAL2
GND
CRYSTAL
DRIVER
4
3
2
1
5 6 7 8
9
10
11
12
13141516
CLOCK
DIVIDER
DIVIDE
BY 32
LOOP
FILTER
ASK
FSK
PA
ENVELOPE
SHAPING
DEVIATION
PD/CP
VCO
Functional Diagram
19-3353; Rev 1; 6/09
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.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
*
EP = Exposed pad.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX1479ATE+
-40°C to +125°C
16 TQFN-EP*
Typical Application Circuit appears at end of data sheet.
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, all RF inputs and outputs are referenced to 50Ω, V
DD
= +2.1V to +3.6V, V
ENABLE
= V
DD
, T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at V
DD
= +2.7V, T
A
= +25°C, unless otherwise noted.) (Note 1)
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.
V
DD
to GND .............................................................-0.3V to +4V
All Other Pins to GND ................................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFN (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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Supply Voltage V
DD
2.1 3.6 V
f
RF
= 315MHz 2.9 4.3
PA off, V
DIN
at
0% duty cycle
(ASK or FSK)
(Note 2)
f
RF
= 433MHz 3.3 4.8
f
RF
= 315MHz 6.7
10.7
V
DIN
at 50% duty
cycle (ASK)
(Notes 3, 4)
f
RF
= 433MHz 7.3
11.4
f
RF
= 315MHz (Note 2)
10.5 17.1
Supply Current I
DD
V
DIN
at 100%
duty cycle (FSK)
f
RF
= 433MHz (Note 4)
11.4 18.1
mA
T
A
= +25°C 0.2
T
A
< +85°C (Note 4)
120
300
Standby Current I
STDBY
V
ENABLE
< V
IL
T
A
< +125°C (Note 2)
700 1600
nA
DIGITAL INPUTS AND OUTPUTS
Data Input High V
IH
(Note 2)
V
DD
-
0.25
V
Data Input Low V
IL
(Note 2)
0.25
V
Maximum Input Current I
IN
20 µA
Output Voltage High V
OH
CLKOUT, load = 10kΩ || 10pF (Note 4)
V
DD
-
0.25
V
Output Voltage Low V
OL
CLKOUT, load = 10kΩ || 10pF (Note 4)
0.25
V
MAX1479
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
_______________________________________________________________________________________ 3
Note 1: Supply current, output power, and efficiency are greatly dependent on board layout and PAOUT match.
Note 2: 100% tested at T
A
= +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: V
ENABLE
= V
IL
to V
ENABLE
= V
IH
. f
OFFSET
is defined as the frequency deviation from the desired carrier frequency.
Note 6: Dependent on crystal and PCB trace capacitance.
Note 7: V
ENABLE
> V
IH
, V
DATA
> V
IH
, Efficiency = P
OUT
/(V
DD
x I
DD
).
Note 8: Dependent on PCB trace capacitance.
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SYSTEM PERFORMANCE
Frequency Range f
RF
(Note 2)
300
450
MHz
Settle to within 50kHz
200
Turn-On Time (Note 5) t
ON
Settle to within 5kHz
350
µs
ASK mode (Manchester coded)
100
Maximum Data Rate (Note 4)
FSK mode (Manchester coded) 20
kbps
f
RF
= 315MHz 55
Maximum FSK Frequency
Deviation
DEV[2:0] = 111
(Note 6)
f
RF
= 433MHz 80
kHz
T
A
= +25°C, V
DD
= +2.7V 6.8 10
12.0
T
A
= +125°C, V
DD
= +2.1V 2.7 5.3Output Power (Note 2) P
OUT
T
A
= -40°C, V
DD
= +3.6V
12.2 16.1
dBm
f
RF
= 315MHz 35
Transmit Efficiency with CW Tone
(Note 7)
f
RF
= 433MHz 34
%
f
RF
= 315MHz 27
Transmit Efficiency at 50% Duty
Cycle
f
RF
= 433MHz 25
%
PHASE-LOCKED-LOOP PERFORMANCE
VCO Gain K
VCO
280 MHz/V
f
OFFSET
= 100kHz -75
f
RF
= 315MHz
f
OFFSET
= 1MHz -98
f
OFFSET
= 100kHz -74
Phase Noise
f
RF
= 433MHz
f
OFFSET
= 1MHz -98
dBc/Hz
f
RF
= 315MHz -50
Maximum Carrier Harmonics
f
RF
= 433MHz -45
dBc
Reference Spur -40 dBc
Loop Bandwidth BW
300
kHz
Crystal Frequency Range f
XTAL
F
RF
/
32 MHz
Crystal Tolerance 50
ppm
Crystal Load Capacitance C
LOAD
(Note 8) 4.5 pF
Clock Output Frequency
D eter m i ned b y C LK0 and C LK1; see Tab l e 1
F
XTAL
/N
MHz
AC ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, all RF inputs and outputs are referenced to 50Ω, V
DD
= +2.1V to +3.6V, V
ENABLE
= V
DD
, T
A
= -40°C to
+125°C, unless otherwise noted. Typical values are at V
DD
= +2.7V, T
A
= +25°C, unless otherwise noted.) (Note 1)
P1-P3P4-P6P7-P9P10-P10

MAX1479ATE+

Mfr. #:
Buy MAX1479ATE+
Manufacturer:
Maxim Integrated
Description:
RF Transmitter 300MHz - 450MHz ASK/FSK Transmitter
Lifecycle:
New from this manufacturer.
Delivery:
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