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PDF MAX1472 Data sheet ( Hoja de datos )
| Número de pieza | MAX1472 | |
| Descripción | Crystal-Based ASK Transmitter | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-2872; Rev 4; 6/12
EVAALVUAAILTAIOBNLEKIT
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
General Description
The MAX1472 is a crystal-referenced phase-locked
loop (PLL) VHF/UHF transmitter designed to transmit
OOK/ASK data in the 300MHz to 450MHz frequency
range. The MAX1472 supports data rates up to
100kbps, and adjustable output power to more than
+10dBm into a 50Ω load. The crystal-based architec-
ture of the MAX1472 eliminates many of the common
problems with SAW transmitters by providing greater
modulation depth, faster frequency settling, higher
tolerance of the transmit frequency, and reduced
temperature dependence. Combined, these improve-
ments enable better overall receiver performance when
using a superheterodyne receiver such as the MAX1470
or MAX1473.
The MAX1472 is available in a 3mm x 3mm 8-pin
SOT23 package and is specified for the automotive
(-40°C to +125°C) temperature range. An evaluation kit
is available. Contact Maxim Integrated Products for
more information.
Applications
Remote Keyless Entry
RF Remote Controls
Tire Pressure Monitoring
Security Systems
Radio-Controlled Toys
Wireless Game Consoles
Wireless Computer Peripherals
Wireless Sensors
Features
o 2.1V to 3.6V Single-Supply Operation
o Low 5.3mA Operating Supply Current*
o Supports ASK with 90dB Modulation Depth
o Output Power Adjustable to More than +10dBm
o Uses Small Low-Cost Crystal
o Small 3mm 3mm 8-Pin SOT23 Package
o Fast-On Oscillator 220µs Startup Time
*At 50% duty cycle (315MHz, 2.7V supply, +10dBm output
power)
Ordering Information
PART
TEMP
RANGE
PIN-
TOP
PACKAGE MARK
MAX1472AKA+T -40°C to +125°C 8 SOT23
AEKS
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Typical Application Circuit
Pin Configuration
*
50Ω
ANTENNA
220pF 680pF
+
1 XTAL1
XTAL2 8
2 GND
VDD 7
3.0V
MAX1472
3 PAGND
DATA 6
DATA INPUT
4 PAOUT
ENABLE 5
STANDBY OR
POWER-UP
*Optional power adjust resistor.
TOP VIEW
+
XTAL1 1
GND 2
PAGND 3
MAX1472
PAOUT 4
SOT23
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.
8 XTAL2
7 VDD
6 DATA
5 ENABLE
1
1 page  
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, VDD = 2.7V, TA = +25°C, unless otherwise noted.)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
50
-40°C +25°C
45
40
35
30
25
2.0
+85°C
+125°C
CW OUTPUT
fRF = 433MHz
2.4 2.8 3.2
SUPPLY VOLTAGE (V)
3.6
PHASE NOISE vs. OFFSET FREQUENCY
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
10 100 1k 10k 100k 1M 10M
fOFFSET (Hz)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
50
45 -40°C
40
+25°C
35
30
25
20
2.0
+85°C
+125°C
OOK OUTPUT AT
50% DUTY CYCLE
fRF = 315MHz
2.4 2.8 3.2
SUPPLY VOLTAGE (V)
3.6
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
12 12MAX1472 toc14
fRF = 315MHz
POWER
10
10
8 CURRENT
8
66
44
22
00
0.1 1 10 100 1000
EXTERNAL RESISTOR (Ω)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
45
40 +25°C
-40°C
35
30
25
20
2.0
+85°C
+125°C
OOK OUTPUT AT
50% DUTY CYCLE
fRF = 433MHz
2.4 2.8 3.2
SUPPLY VOLTAGE (V)
3.6
SUPPLY CURRENT vs. OUTPUT POWER
10
fRF = 315MHz
9
8
7
CW
6
5
4
50% DUTY CYCLE
3
2
0 2 4 6 8 10
OUTPUT POWER (dBm)
FREQUENCY SETTLING TIME
MAX1472 toc16
25kHz/div
START: 0s
ENABLE
TRANSITION
FROM LOW
TO HIGH
1ms
AM DEMODULATION OF PA OUTPUT
MAX1472 toc17
DATA RATE
= 100kHz
15%/div
2.5kHz/div
START: 0s
ENABLE
TRANSITION
FROM LOW
TO HIGH
1ms
START: 0s
STOP: 20µs
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX1472.PDF ] | |
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