300MHz to 450MHz Frequency-Programmable
ASK/FSK Transmitter
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(50& system impedance, V
AVDD
= V
DVDD
= V
PAVDD
= +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
= -40癈 to +125癈, unless oth-
erwise noted. Typical values are at V
AVDD
= V
DVDD
= V
PAVDD
= +2.7V, T
A
= +25癈, unless otherwise noted.)
EFFICIENCY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
3.3
3.0
2.7
2.4
13
11
17
21
25
9
15
19
23
2.1
3.6
f
RF
= 315MHz
50% DUTY CYCLE
T
A
= +85癈
T
A
= +125癈
T
A
= +25癈
T
A
= -40癈
EFFICIENCY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
3.3
3.0
2.7
2.4
15
20
25
30
35
10
2.1
3.6
f
RF
= 433.92MHz
PA ON
T
A
= +85癈
T
A
= +125癈
T
A
= +25癈
T
A
= -40癈
EFFICIENCY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
3.3
3.0
2.7
2.4
11
13
15
17
19
21
23
9
2.1
3.6
f
RF
= 433.92MHz
50% DUTY CYCLE
T
A
= +85癈
T
A
= +25癈
T
A
= +125癈
T
A
= -40癈
-76
-56
-66
-36
-46
-16
-26
-6
+14
+4
+24
FSK SPECTRUM
100kHz DEVIATION, 4kHz SQUARE-WAVE
MODULATION. SPAN = 1.00MHz
RBW = 10kHz
VBW = 10kHz
VIDEO AVG ON
-10
-4
-6
-8
-2
0
2
4
6
8
10
2.1
2.7
2.4
3.0
3.3
3.6
FREQUENCY STABILITY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
f
RF
= 433.92MHz
f
RF
= 315MHz
EFFICIENCY
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
3.3
3.0
2.7
2.4
15
20
25
30
35
10
2.1
3.6
f
RF
= 315MHz
PA ON
T
A
= +85癈
T
A
= +125癈
T
A
= +25癈
T
A
= -40癈
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