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MAX1472AKA+T

P1-P3P4-P6P7-P9
General Description
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.
Applications
Remote Keyless Entry
RF Remote Controls
Tire Pressure Monitoring
Security Systems
Radio-Controlled Toys
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
Features
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
3mm 8-Pin SOT23 Package
o Fast-On Oscillator 220µs Startup Time
MAX1472
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
1
DATA
ENABLEPAOUT
1
2
8
7
XTAL2
V
DD
GND
PAGND
XTAL1
SOT23
TOP VIEW
3
4
6
5
MAX1472
+
Pin Configuration
Ordering Information
8
7
6
5
1
+
2
3
4
DATA
ENABLE
PAOUT
XTAL2
V
DD
GND
PAGND
XTAL1
MAX1472
3.0V
DATA INPUT
STANDBY OR
POWER-UP
*
680pF220pF
50Ω
ANTENNA
Typical Application Circuit
19-2872; Rev 4; 6/12
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.
EVALUATION KIT
AVAILABLE
PART
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
MAX1472AKA+T -40°C to +125°C 8 SOT23 AEKS
*
Optional power adjust resistor.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*
At 50% duty cycle (315MHz, 2.7V supply, +10dBm output
power)
MAX1472
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
2
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.
V
DD
to GND ..........................................................-0.3V to +4.0V
All Other Pins to GND ................................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +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
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
ELECTRICAL CHARACTERISTICS
(
Typical Application Circuit
, output power is 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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYSTEM PERFORMANCE
Supply Voltage V
DD
2.1 3.6 V
V
ENABLE
= V
DD
(Note 2)
5.3 9.4
V
ENABLE
= V
DD
,
V
DATA
= V
DD
9.1 16.6f
RF
= 315MHz
V
ENABLE
= V
DD
,
V
DATA
= 0V
1.5 2.3
V
ENABLE
= V
DD
(Note 2)
5.7
V
ENABLE
= V
DD
,
V
DATA
= V
DD
9.6
Supply Current I
DD
f
RF
= 433MHz
V
ENABLE
= V
DD
,
V
DATA
= 0V
1.7 2.7
mA
V
ENABLE
< V
IL
, T
A
< +85°C (Note 3) 5 350 nA
Standby Current I
STDBY
V
ENABLE
< V
IL
T
A
< +125°C (Note 3) 1.7 µA
Frequency Range f
RF
(Note 1) 300 450 MHz
Data Rate (Note 3) 0 100 kbps
Modulation Depth ON to OFF P
OUT
ratio (Note 4) 90 dB
T
A
= +25°C, V
DD
= 2.7V (Notes 5, 6) 7.3 10.3 12.8
T
A
= + 125° C , V
D D
= 2.1V ( N otes 5, 6) 3.3 6.0
Output Power P
OUT
T
A
= -40°C, V
DD
= 3.6V (Notes 5, 6) 13.7 16.2
dBm
To f
OFFSET
< 50kHz (Note 7) 220
Turn-On Time t
ON
To f
OFFSET
< 5kHz (Note 7) 450
µs
f
RF
= 315MHz (Note 8) 43.6
Transmit Efficiency with CW
f
RF
= 433MHz (Note 8) 41.3
%
f
RF
= 315MHz (Note 9) 37.6
Transmit Efficiency at 50%
Duty Cycle
f
RF
= 433MHz (Note 9) 35.1
%
MAX1472
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
3
ELECTRICAL CHARACTERISTICS (continued)
(
Typical Application Circuit
, output power is 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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PHASE-LOCKED LOOP PERFORMANCE
VCO Gain 330 MHz/V
f
OFFSET
=100kHz -84
f
RF
= 315MHz
f
OFFSET
= 1MHz -91
f
OFFSET
=100kHz -82
Phase Noise
f
RF
= 433MHz
f
OFFSET
= 1MHz -89
dBc/Hz
f
RF
= 315MHz -50
Maximum Carrier Harmonics
f
RF
= 433MHz -50
dBc
f
RF
= 315MHz -75
Reference Spur
f
RF
= 433MHz -81
dBc
Loop Bandwidth 1.6 MHz
Crystal Frequency f
XTAL
f
RF
/ 32 MHz
Oscillator Input Capacitance From each XTAL pin to GND 6.2 pF
Frequency Pushing by V
DD
3 ppm/V
DIGITAL INPUTS
Data Input High V
IH
V
D D
- 0.25 V
Data Input Low V
IL
0.25 V
Maximum Input Current 2nA
Pulldown Current 25 µA
Note 1: 100% tested at T
A
= +25°C. Guaranteed by design and characterization over temperature.
Note 2: 50% duty cycle at 10kHz data.
Note 3: Guaranteed by design and characterization, not production tested.
Note 4: Generally limited by PC board layout.
Note 5: Output power can be adjusted with external resistor.
Note 6: Guaranteed by design and characterization at f
RF
= 315MHz.
Note 7: V
ENABLE
< V
IL
to V
ENABLE
> V
IH
. f
OFFSET
is defined as the frequency deviation from the desired carrier frequency.
Note 8: V
ENABLE
> V
IH
, V
DATA
> V
IH
, Efficiency = P
OUT
/(V
DD
x I
DD
).
Note 9: V
ENABLE
> V
IH
, DATA toggled from V
IL
to V
IH
, 10kHz, 50% duty cycle, Efficiency = P
OUT
/(V
DD
x I
DD
).
P1-P3P4-P6P7-P9

MAX1472AKA+T

Mfr. #:
Buy MAX1472AKA+T
Manufacturer:
Maxim Integrated
Description:
RF Transmitter 300-450MHz Low-P Crystal-Based ASK
Lifecycle:
New from this manufacturer.
Delivery:
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