Typical operating characteristics (continued) – Rainbow Electronics MAX7057 User Manual
Page 7
MAX7057
300MHz to 450MHz Frequency-Programmable
ASK/FSK Transmitter
_______________________________________________________________________________________
7
Typical Operating Characteristics (continued)
(50Ω system impedance, AVDD = DVDD = PAVDD = +2.1V to +3.6V, f
RF
= 300MHz to 450MHz, T
A
= -40°C to +125°C, unless other-
wise noted. Typical values are at AVDD = DVDD = PAVDD = +2.7V, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7057 toc18
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
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
°C
T
A
= +125
°C
T
A
= +25
°C
T
A
= -40
°C
EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7057 toc19
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
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
°C
T
A
= +125
°C
T
A
= +25
°C
T
A
= -40
°C
EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7057 toc20
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
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
°C
T
A
= +25
°C
T
A
= +125
°C
T
A
= -40
°C
-76
-56
-66
-36
-46
-16
-26
-6
+14
+4
+24
FSK SPECTRUM
MAX7057 toc21
(dBm)
100kHz DEVIATION, 4kHz SQUARE-WAVE
MODULATION. SPAN = 1.00MHz
-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
MAX7057 toc16
SUPPLY VOLTAGE (V)
FREQUENCY STABILITY (ppm)
f
RF
= 433.92MHz
f
RF
= 315MHz
EFFICIENCY
vs. SUPPLY VOLTAGE
MAX7057 toc17
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
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
°C
T
A
= +125
°C
T
A
= +25
°C
T
A
= -40
°C