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PDF MAX7044 Data sheet ( Hoja de datos )
| Número de pieza | MAX7044 | |
| Descripción | 300MHz to 450MHz High-Efficiency Crystal-Based 13dBm ASK Transmitter | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3221; Rev 0; 1/04
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
300MHz to 450MHz High-Efficiency,
Crystal-Based +13dBm ASK Transmitter
General Description
The MAX7044 crystal-referenced phase-locked-loop
(PLL) VHF/UHF transmitter is designed to transmit
OOK/ASK data in the 300MHz to 450MHz frequency
range. The MAX7044 supports data rates up to 100kbps,
and provides output power up to +13dBm into a 50Ω
load while only drawing 7.7mA at 2.7V.
The crystal-based architecture of the MAX7044 elimi-
nates many of the common problems with SAW-based
transmitters by providing greater modulation depth,
faster frequency settling, higher tolerance of the trans-
mit frequency, and reduced temperature dependence.
The MAX7044 also features a low supply voltage of
+2.1V to +3.6V. These improvements enable better
overall receiver performance when using the MAX7044
together with a superheterodyne receiver such as the
MAX1470 or MAX1473.
A simple, single-input data interface and a buffered
clock-out signal at 1/16th the crystal frequency make
the MAX7044 compatible with almost any microcon-
troller or code-hopping generator.
The MAX7044 is available in an 8-pin SOT23 package
and is specified over the -40°C to +125°C automotive
temperature range.
Applications
Remote Keyless Entry (RKE)
Tire-Pressure Monitoring (TPM)
Security Systems
Garage Door Openers
RF Remote Controls
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
Typical Application Circuit
Features
♦ +2.1V to +3.6V Single-Supply Operation
♦ OOK/ASK Transmit Data Format
♦ Up to 100kbps Data Rate
♦ +13dBm Output Power into 50Ω Load
♦ Low 7.7mA (typ) Operating Supply Current*
♦ Uses Small, Low-Cost Crystal
♦ Small 3mm x 3mm 8-Pin SOT23 Package
♦ Fast-On Oscillator: 250µs Startup Time
* At 50% duty cycle (315MHz, 2.7V supply, +13dBm
output power)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
TOP MARK
MAX7044AKA-T -40°C to +125°C 8 SOT23-8
AEJW
Pin Configuration
100nF
220pF
ANTENNA
3.0V
680pF
fXTAL
18
XTAL1 XTAL2
2
GND
7
VDD
3 MAX7044 6
PAGND DATA
45
PAOUT CLKOUT
3.0V
100nF
DATA INPUT
CLOCK
OUTPUT
(fCLKOUT =
fXTAL/16)
TOP VIEW
XTAL1 1
GND 2
PAGND 3
PAOUT 4
MAX7044
8 XTAL2
7 VDD
6 DATA
5 CLKOUT
SOT23
________________________________________________________________ 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  
www.DataSheet4U.com
300MHz to 450MHz High-Efficiency,
Crystal-Based +13dBm ASK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, VDD = +2.7V, TA = +25°C, unless otherwise noted.) (Note 1)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
60
fRF = 315MHz
55 PA 50% DUTY CYCLE AT 10kHz
50 TA = -40°C
TA = +25°C
45
40
35 TA = +85°C
30
25 TA = +125°C
20
2.1
2.4 2.7 3.0 3.3
SUPPLY VOLTAGE (V)
3.6
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
70
fRF = 433MHz
65 PA ON
TA = -40°C
60 TA = +25°C
55
50
45
TA = +85°C
40
TA = +125°C
35
30
2.1
2.4 2.7 3.0 3.3
SUPPLY VOLTAGE (V)
3.6
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
60
fRF = 433MHz
TA = +25°C
55 PA 50% DUTY CYCLE AT 10kHz
50 TA = -40°C
45
40
35 TA = +85°C
30
25 TA = +125°C
20
15
2.1
2.4 2.7 3.0 3.3
SUPPLY VOLTAGE (V)
3.6
PHASE NOISE vs. OFFSET FREQUENCY
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
0.01
0.1 1 10 100 1k
OFFSET FREQUENCY (Hz)
10k
FREQUENCY SETTLING TIME
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
18 16MAX7044 toc14
16
POWER
12
14 8
12 CURRENT
10
4
0
8 -4
6 -8
4 fRF = 315MHz
PA ON
2
01
10
100 1000
EXTERNAL RESISTOR (Ω)
-12
-16
10,000
AM DEMODULATION OF PA OUTPUT
DATA RATE = 100kHz
SUPPLY CURRENT vs. OUTPUT POWER
18
fRF = 315MHz
15
12
PA ON
9
6
3
0
-10
50% DUTY CYCLE
-6 -2 2 6 10
OUTPUT POWER (dBm)
14
OUTPUT SPECTRUM
50kHz/div
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX7044.PDF ] | |
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