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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.)
50
SYSTEM GAIN vs. IF FREQUENCY
(1x I LNA )
60
SYSTEM GAIN vs. IF FREQUENCY
(2x I LNA )
UPPER SIDEBAND
60
IMAGE REJECTION vs. TEMPERATURE
(1x I LNA )
40
UPPER SIDEBAND
50
50
f RF = 433.92MHz
30
20
45dB IMAGE
REJECTION
FROM RFIN
TO MIXOUT
f RF = 433.92MHz
40
30
45dB IMAGE
REJECTION
FROM RFIN
TO MIXOUT
f RF = 433.92MHz
40
30
f RF = 315MHz
20
10
0
LOWER SIDEBAND
10
0
LOWER SIDEBAND
20
10
-10
0
5
10
15
20
25
30
-10
0
5
10
15
20
25
30
0
-40
-15
10
35
60
85
110
IF FREQUENCY (MHz)
IMAGE REJECTION vs. TEMPERATURE
(2x I LNA )
60
IF FREQUENCY (MHz)
0
NORMALIZED IF GAIN
vs. IF FREQUENCY
TEMPERATURE ( ° C)
50
40
30
20
10
0
f RF = 433.92MHz
f RF = 315MHz
-3
-6
-9
-12
-15
-18
-40
-15
10
35
60
85
110
1
10
100
TEMPERATURE ( ° C)
0
-4
-8
-12
-16
S11 vs. RF FREQUENCY
433.92MHz
IF FREQUENCY (MHz)
100
250
400
550
700
850
1000
RF FREQUENCY (MHz)
6
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