MAX1479 Maxim, MAX1479 Datasheet
![no-image](/images/no-image-200.jpg)
MAX1479
Manufacturer Part Number
MAX1479
Description
300MHz to 450MHz Low-Power / Crystal-Based +10dBm ASK/FSK Transmitter
Manufacturer
Maxim
Datasheet
1.MAX1479.pdf
(11 pages)
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 thin QFN pack-
age (3mm x 3mm) and is specified for the automotive
temperature range from -40°C to +125°C.
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.
ENABLE
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
MODE
V
DIN
Crystal-Based +10dBm ASK/FSK Transmitter
DD
1
2
3
4
ASK
FSK
16
DIVIDER
5
CLOCK
________________________________________________________________ Maxim Integrated Products
General Description
15
ENVELOPE
6
Functional Diagram
SHAPING
CRYSTAL
DRIVER
MAX1479
PD/CP
DIVIDE
BY 32
14
7
FILTER
LOOP
DEVIATION
VCO
Applications
PA
13
8
300MHz to 450MHz Low-Power,
12
11
10
9
DEV1
DEV0
CLK1
CLK0
♦ 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,
♦ Uses Small Low-Cost Crystal
♦ Small 16-Pin Thin QFN Package
♦ Fast-On Oscillator—200µs Startup Time
♦ Programmable Clock Output
*EP = Exposed paddle.
Typical Application Circuit appears at end of data sheet.
MAX1479ATE
and 10.5mA in FSK Mode)
TOP VIEW
PART
ENABLE
MODE
V
DIN
DD
1
2
3
4
16
(3mm x 3mm)
-40°C to +125°C
5
TEMP RANGE
Ordering Information
EP
THIN QFN
MAX1479
15
6
Pin Configuration
14
7
13
8
12
11
10
9
PIN-PACKAGE
16 Thin QFN-EP*
DEV1
DEV0
CLK1
CLK0
Features
1