Datasheet

MAX1472
300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
5
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX1472 toc10
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
3.22.82.4
30
35
40
45
50
25
2.0 3.6
-40
°
C
+25
°
C
+85
°
C
+125
°
C
CW OUTPUT
f
RF
= 433MHz
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX1472 toc11
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
3.22.82.4
20
25
30
35
40
45
50
2.0 3.6
-40
°
C
+25
°
C
+85
°
C
+125
°
C
OOK OUTPUT AT
50% DUTY CYCLE
f
RF
= 315MHz
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
MAX1472 toc12
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
3.22.4 2.8
25
30
35
40
45
20
2.0 3.6
-40
°
C
+25
°
C
+85
°
C
+125
°
C
OOK OUTPUT AT
50% DUTY CYCLE
f
RF
= 433MHz
PHASE NOISE vs. OFFSET FREQUENCY
MAX1472 toc13
f
OFFSET
(Hz)
PHASE NOISE (dBc/Hz)
1M100k10k1k100
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-140
10 10M
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
MAX1472 toc14
EXTERNAL RESISTOR (
Ω
)
OUTPUT POWER (dBm)
100101
2
4
6
8
10
12
0
0.1 1000
2
4
6
8
10
12
0
SUPPLY CURRENT (mA)
POWER
CURRENT
f
RF
= 315MHz
SUPPLY CURRENT vs. OUTPUT POWER
MAX1472 toc15
OUTPUT POWER (dBm)
SUPPLY CURRENT (mA)
862 4
3
4
5
6
7
8
9
10
2
010
f
RF
= 315MHz
50% DUTY CYCLE
CW
FREQUENCY SETTLING TIME
MAX1472 toc16
25kHz/div
ENABLE
TRANSITION
FROM LOW
TO HIGH
ENABLE
TRANSITION
FROM LOW
TO HIGH
2.5kHz/div
START: 0s
START: 0s
1ms
1ms
Typical Operating Characteristics (continued)
( Typical Application Circuit , V
DD
= 2.7V, T
A
= +25°C, unless otherwise noted.)
AM DEMODULATION OF PA OUTPUT
MAX1472 toc17
DATA RATE
= 100kHz
START: 0s STOP: 20µs
15%/div