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308MHz/315MHz/418MHz/433.92MHz
Low-Power, FSK Superheterodyne Receiver
Typical Operating Characteristics (continued)
(Typical Application Circuit, V DD = 3.0V, f RF = 433.92MHz, IF BW = 280kHz, data rate = 4kbps Manchester encoded, frequency
deviation = ±50kHz, BER = 0.2%, T A = +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. RF FREQUENCY
BIT-ERROR RATE vs. AVERAGE INPUT POWER
7.5
(2x I LNA )
1000
DEEP-SLEEP CURRENT vs. TEMPERATURE
100
(1x I LNA )
7.3
7.1
+125 ° C
+85 ° C
800
10
f RF = 433.92MHz
6.9
6.7
+25 ° C
600
400
V DD = +3.6V
V DD = +3.0V
1
0.2% BER
6.5
6.3
-40 ° C
200
V DD = +2.4V
0.1
f RF = 315MHz
6.1
0
0.01
300
325
350
375
400
425
450
-40
-15
10
35
60
85
110
-114
-112
-110
-108
-106
-104
RF FREQUENCY (MHz)
BIT-ERROR RATE vs. AVERAGE INPUT POWER
TEMPERATURE ( ° C)
SENSITIVITY vs. TEMPERATURE
AVERAGE INPUT POWER (dBm)
SENSITIVITY vs. TEMPERATURE
100
(2x I LNA )
-103
(1x I LNA )
-106
(2x I LNA )
f RF = 433.92MHz
10
-104
-105
-107
-108
1
0.1
0.2% BER
-106
-107
f RF = 433.92MHz
-109
-110
f RF = 433.92MHz
f RF = 315MHz
-108
f RF = 315MHz
-111
f RF = 315MHz
0.01
-117
-115
-113
-111
-109
-107
-109
-40
-15
10
35
60
85
110
-112
-40
-15
10
35
60
85
110
AVERAGE INPUT POWER (dBm)
SENSITIVITY
vs. FREQUENCY DEVIATION
TEMPERATURE ( ° C)
RSSI AND DELTA
vs. IF INPUT POWER
TEMPERATURE ( ° C)
FSK DEMODULATOR OUTPUT
vs. IF FREQUENCY
-100
-102
-104
FREQUENCY DEVIATION IS
MEASURED FROM 0 TO PEAK
1.8
1.5
1.2
RSSI
MAX7042 toc11
3
2
1
2.0
1.6
1.2
-106
-108
0.9
0.6
DELTA
0
-1
0.8
-110
-112
0.3
0
-2
-3
0.4
0
1
10
100
-90
-70
-50
-30
-10
10
10.3
10.4
10.5
10.6
10.7
10.8
10.9
11.0
FREQUENCY DEVIATION (kHz)
IF INPUT POWER (dBm)
IF FREQUENCY (MHz)
_______________________________________________________________________________________
5
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