300MHz to 450MHz Frequency-Programmable
ASK/FSK Transmitter
6 _______________________________________________________________________________________
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.)
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
MAX7057 toc10
EXTERNAL RESISTOR (&)
1000
100
10
1
2
4
6
8
9
1
3
5
7
0
-15
-10
-5
0
5
10
-25
-20
0.1
10,000
f
RF
= 315MHz
50% DUTY CYCLE
SUPPLY CURRENT
OUTPUT POWER
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
MAX7057 toc11
EXTERNAL RESISTOR (&)
1000
100
10
1
2
4
6
8
10
14
12
0
-15
-10
-5
0
5
15
10
-25
-20
0.1
10,000
f
RF
= 433.92MHz
PA ON
SUPPLY CURRENT
OUTPUT POWER
SUPPLY CURRENT AND OUTPUT POWER
vs. EXTERNAL RESISTOR
MAX7057 toc12
EXTERNAL RESISTOR (&)
1000
100
10
1
2
4
6
8
9
1
3
5
7
0
-15
-10
-5
0
5
10
-30
-20
0.1
10,000
f
RF
= 433.92MHz
50% DUTY CYCLE
SUPPLY CURRENT
OUTPUT POWER
-25
PHASE NOISE vs. OFFSET FREQUENCY
-60
-70
-80
-90
-100
-110
-120
-130
-140
100
10k
100k
1M
10M
1k
OFFSET FREQUENCY (Hz)
f
RF
= 315MHz
-50
-60
-70
-80
-90
-100
-110
-120
-130
100
10k
100k
1M
10M
1k
PHASE NOISE vs. OFFSET FREQUENCY
OFFSET FREQUENCY (Hz)
f
RF
= 433.92MHz
-60
-50
-55
-40
-45
-35
-30
2.1
3.6
REFERENCE SPUR MAGNITUDE
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
2.7
2.4
3.0
3.3
f
RF
= 433.92MHz
f
RF
= 315MHz
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