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PDF MAX1479 Data sheet ( Hoja de datos )
| Número de pieza | MAX1479 | |
| Descripción | 300MHz to 450MHz Low-Power / Crystal-Based +10dBm ASK/FSK Transmitter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3353; Rev 0; 8/04
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 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
Functional Diagram
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
Ordering Information
PART
TEMP RANGE
MAX1479ATE
-40°C to +125°C
*EP = Exposed paddle.
PIN-PACKAGE
16 Thin QFN-EP*
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
CLOCK
DIVIDER
MAX1479
ENVELOPE
SHAPING
PA
12 DEV1
11 DEV0
10 CLK1
9 CLK0
56 78
TOP VIEW
VDD
MODE
1
2
DIN 3
ENABLE 4
16 15 14 13
MAX1479
EP
12 DEV1
11 DEV0
10 CLK1
9 CLK0
5678
THIN QFN
(3mm x 3mm)
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, VDD = +2.7V, TA = +25°C, unless otherwise noted.)
OUTPUT POWER vs. SUPPLY VOLTAGE
16
fRF = 315MHz
PA ON
14
TA = -40°C
12 TA = +25°C
10
TA = +85°C
8
TA = +125°C
6
4
2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
16
fRF = 433MHz
PA ON
14
TA = -40°C
12 TA = +25°C
10
TA = +85°C
8
TA = +125°C
6
4
2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
16
fRF = 315MHz
14
PA ON
ENVELOPE SHAPING
TA = -40°C
DISABLED
12 TA = +25°C
10
TA = +85°C
8
TA = +125°C
6
4
2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
OUTPUT POWER vs. SUPPLY VOLTAGE
16
fRF = 433MHz
14
PA ON
ENVELOPE SHAPING
TA = -40°C
DISABLED
12 TA = +25°C
10
TA = +85°C
8
TA = +125°C
6
4
2.1 2.4 2.7 3.0 3.3 3.6
SUPPLY VOLTAGE (V)
PHASE NOISE vs. OFFSET FREQUENCY
-40
-50
-60
fRF = 315MHz
-70
-80
-90
-100 fRF = 433MHz
-110
-120
-130
-140
100
1k 10k 100k 1M
OFFSET FREQUENCY (Hz)
10M
CLOCK SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
-40
fRF = 315MHz
-45
CLKOUT SPUR = fRF ± fCLKOUT
10pF LOAD CAPACITANCE
-50 fCLKOUT = fXTAL/16
-55
-60 fCLKOUT = fXTAL/8
-65 fCLKOUT = fXTAL/4
-70
2.1
2.4 2.7 3.0 3.3
SUPPLY VOLTAGE (V)
3.6
10
8
6
4
2
0
-2
-4
-6
-8
-10
2.1
FREQUENCY STABILITY
vs. SUPPLY VOLTAGE
fRF = 315MHz
fRF = 433MHz
2.4 2.7 3.0 3.3
SUPPLY VOLTAGE (V)
3.6
_______________________________________________________________________________________ 5
5 Page 
300MHz to 450MHz Low-Power,
Crystal-Based +10dBm ASK/FSK Transmitter
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
EXPOSED PAD VARIATIONS
DOWN
BONDS
ALLOWED
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO
JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED
WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR
MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm
FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220 REVISION C.
PACKAGE OUTLINE
12, 16L, THIN QFN, 3x3x0.8mm
21-0136
E
2
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2004 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX1479.PDF ] | |
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