Rainbow Electronics MAX1479 - Manual

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 50
Ω 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 thin QFN pack-
age (3mm x 3mm) and is specified for the automotive
temperature 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
♦ ETSI-Compliant EN300 220
♦ +2.1V to +3.6V Single-Supply Operation
♦ Supports ASK, OOK, and FSK Modulations
♦ Adjustable FSK Shift
♦ +10dBm Output Power into 50Ω Load
♦ Low Supply Current (6.7mA in ASK Mode,
and 10.5mA in FSK Mode)
♦ Uses Small Low-Cost Crystal
♦ Small 16-Pin Thin QFN Package
♦ Fast-On Oscillator—200µs Startup Time
♦ 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
5 6 7 8
V
DD_
PA
CLKOUT
PAOUT
ROUT
MAX1479
GND XTAL2 XTAL1 DEV2
THIN QFN
(3mm x 3mm)
Pin Configuration
Ordering Information
MAX1479
ENABLE
DIN
MODE
V DD
CLKOUT V DD_
PA
ROUT
PAOUT
CLK0
CLK1
DEV0
DEV1
DEV2 XT
AL1
XT
AL2
GND
CRYSTAL
DRIVER
4
3
2
1
5 6 7 8
9
10
11
12
13 14 15 16
CLOCK
DIVIDER
DIVIDE
BY 32
LOOP
FILTER
ASK
FSK
PA
ENVELOPE
SHAPING
DEVIATION
PD/CP
VCO
Functional Diagram
19-3353; Rev 0; 8/04
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*EP = Exposed paddle.
PART TEMP RANGE PIN-PACKAGE
MAX1479ATE -40°C to +125°C 16 Thin QFN-EP*
Typical Application Circuit appears at end of data sheet.