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315MHz Low-Power, +3V Superheterodyne
Receiver
Typical Operating Characteristics
(V DD = +3.3V, T A = +25 ° C, unless otherwise noted. Typical Application Circuit.)
SUPPLY CURRENT vs.
BIT-ERROR RATE vs. AVERAGE
6.1
SUPPLY VOLTAGE
10
RF INPUT POWER
2.2
RSSI vs. AVERAGE RF INPUT POWER
IF BANDWIDTH = 350kHz
5.9
5.7
T A = +85 ° C
2.0
1.8
5.5
5.3
5.1
T A = +25 ° C
1
1.6
1.4
4.9
4.7
T A = -40 ° C
0.1
1.2
1.0
2.7
2.9
3.1
3.3
3.5
-120
-118
-116
-114
-140 -120
-100
-80
-60
-40
-20
SUPPLY VOLTAGE (V)
RECEIVER SENSITIVITY
vs. TEMPERATURE
AVERAGE RF INPUT POWER (dBm)
IMAGE REJECTION vs. TEMPERATURE
AVERAGE RF INPUT POWER (dBm)
SYSTEM GAIN vs. IF FREQUENCY
-116.0
AVERAGE RF INPUT POWER
60
60
FROM RFIN TO MIXOUT
-116.5
1% BER
IF BANDWIDTH = 350kHz
55
50
40
f LO = 304.3MHz
UPPER SIDEBAND
30
-117.0
20
53dB IMAGE
REJECTION
-117.5
-118.0
50
45
10
0
-10
LOWER SIDEBAND
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
0
10
20 30
40
TEMPERATURE ( ° C)
LNA GAIN vs. RF FREQUENCY
TEMPERATURE (°C)
SUPPLY CURRENT
vs. LO FREQUENCY
IF FREQUENCY (MHz)
INPUT IMPEDANCE vs.
INDUCTIVE DEGENERATION
30
7.2
70
MAX1470 toc09
0
LC TANK
FILTER TUNED
TO 315MHz
6.7
60
-50
25
6.2
50
REAL IMPEDANCE
-100
40
-150
20
5.7
30
-200
15
5.2
20
-250
4.7
10
IMAGINARY IMPEDANCE
-300
10
4.2
0
-350
250
275
300
325
350
375
150
200
250
300
350
400
450
500
1
10
100
RF FREQUENCY (MHz)
LO FREQUENCY (MHz)
INDUCTIVE DEGENERATION (nH)
4
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