MAX1479_09 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – 300MHz to 450MHz Low-Power, Crystal-Based +10dBm ASK/FSK Transmitter

19-3353; Rev 1; 6/09
EVAALVUAAILTAIOBNLEKIT
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
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
Functional Diagram
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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1479ATE+
-40°C to +125°C 16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit appears at end of data sheet.
Pin Configuration
16
15
14
13
VDD 1
MODE 2
DIN ³
ENABLE 4
CRYSTAL
DRIVER
PD/CP
DEVIATION
LOOP
FILTER
ASK
FSK
DIVIDE
BY 32
VCO
MAX1479
PA
CLOCK
DIVIDER
ENVELOPE
SHAPING
12 DEV1
11 DEV0
10 CLK1
9 CLK0
TOP VIEW
V_DD 1
MODE 2
DIN 3
ENABLE 4
16 15 14 13
MAX1479
EP*
12 DEV1
11 DEV0
10 CLK1
9 CLK0
5678
5
6
7
8
TQFN
(3mm x 3mm)
*CONNECT EP TO GND.
________________________________________________________________ Maxim Integrated Products 1
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.