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300MHz to 450MHz High-Efficiency,
Crystal-Based +13dBm ASK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, V DD = +2.7V, T A = +25°C, unless otherwise noted.) (Note 1)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
60
55
50
f RF = 315MHz
PA 50% DUTY CYCLE AT 10kHz
T A = +25 ° C
T A = -40 ° C
70
65
60
f RF = 433MHz
PA ON
T A = +25 ° C
T A = -40 ° C
60
55
50
f RF = 433MHz
PA 50% DUTY CYCLE AT 10kHz
T A = -40 ° C
T A = +25 ° C
45
55
45
40
40
35
30
25
T A = +125 ° C
T A = +85 ° C
50
45
40
35
T A = +125 ° C
T A = +85 ° C
35
30
25
20
T A = +125 ° C
T A = +85 ° C
20
30
15
2.1
2.4
2.7
3.0
3.3
3.6
2.1
2.4
2.7
3.0
3.3
3.6
2.1
2.4
2.7
3.0
3.3
3.6
SUPPLY VOLTAGE (V)
PHASE NOISE vs. OFFSET FREQUENCY
SUPPLY VOLTAGE (V)
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. OUTPUT POWER
-40
-50
-60
-70
-80
18
16
14
12
CURRENT
MAX7044 toc14
POWER
16
12
8
4
18
15
12
f RF = 315MHz
PA ON
-90
10
0
9
-100
-110
-120
-130
-140
8
6
4
2
f RF = 315MHz
PA ON
-4
-8
-12
-16
6
3
0
50% DUTY CYCLE
0.01
0.1
1
10
100
1
10
0
1
10
100
1000
10,000
-10
-6
-2
2
6
10
14
50kHz/
div
OFFSET FREQUENCY (kHz)
FREQUENCY SETTLING TIME
25 μ s/div
5dB/
div
EXTERNAL RESISTOR ( Ω )
AM DEMODULATION OF PA OUTPUT
DATA RATE = 100kHz
3.2 μ s/div
0dB
10dB/
div
OUTPUT POWER (dBm)
OUTPUT SPECTRUM
f RF = 315MHz
100MHz/div
_______________________________________________________________________________________
5
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