MAX1472_10 Datasheet, PDF (5/9 Pages) Maxim Integrated Products – 300MHz-to-450MHz Low-Power, Crystal-Based ASK Transmitter

300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
Typical Operating Characteristics (continued)
(Typical Application Circuit, V_DD = 2.7V, T_A = +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
f_RF = 433MHz
2.4
2.8
3.2
3.6
SUPPLY VOLTAGE (V)
PHASE NOISE vs. OFFSET FREQUENCY
-40
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
10 100 1k 10k 100k 1M 10M
f_OFFSET (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
f_RF = 315MHz
2.4
2.8
3.2
3.6
SUPPLY VOLTAGE (V)
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
12
12 ^{MAX1472 toc14}
f_RF = 315MHz
POWER
10
10
8
CURRENT
8
6
6
4
4
2
2
0
0
0.1
1
10
100
1000
EXTERNAL RESISTOR (Ω)
TRANSMIT POWER EFFICIENCY
vs. SUPPLY VOLTAGE
45
40 _{-40°C +25°C}
35
30
25
20
2.0
+85°C
+125°C
OOK OUTPUT AT
50% DUTY CYCLE
f_RF = 433MHz
2.4
2.8
3.2
3.6
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. OUTPUT POWER
10
f_RF = 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
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