MC3371 Datasheet, PDF (14/20 Pages) Motorola, Inc – LOW POWER FM IF

MC3371 MC3372
VCC = 4.0 Vdc
Figure 13. Typical Application for MC3372 at 45 MHz
RSSI Output
to Meter (Triplett – 100 kV)
R2
12 k
+ _C9
10
RF Input
45 MHz C17
120
C18
75
L1
0.245 µH
Coilcraft
150–07J08
R3
100 k
C2 ⁺ _R4
4.7
1.0 k
D1 1N5817 _R5
4.7 k _R6
VR1 (Squelch Control)
10 k
R14
51 k
R1
C1 470
0.01
16 15 14
C3
C4
560
C6
0.1
0.1 _{0.001 R7}
R8
C5 ^{4.7 k}
0.001
3.3 k C7
0.022
C8
0.22
R9
510 k
13 12
11
10
9
VR2
10 k
Squelch Trigger
with Hysteresis
Filter ^–
AF
Amp
Amp
+
Demodulator
Mixer
Oscillator
10
Limiter
Amp
53 k
1
2
3
45
6
7
8
C16
0.01
Coilcraft
143–13J12
C10
30
C11
5.0
L2
0.84 µH
44.545
R13
MHz
1.0 k
C13
R10
0.1
1.8 k
C12
R11
51 k
C14
27
0.1
R12
4.3 k
muRata
CDB455C16
muRata
C15
CFU455D2
0.1
or
equivalent
AF Out
to Audio
Power Amp
Figure 14. RSSI Output versus RF Input
3.5
3.0
2.5
2.0
1.5
fRF = 10.7 MHz
1.0
VCC = 4.0 Vdc
Reference Figure 11
0.5
0
–120
–100
–80
–60
–40
–20
14
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–120
Figure 15. RSSI Output versus RF Input
fRF = 45 MHz
VCC = 4.0 Vdc
Reference Figure 13
–100
–80
–60
–40
–20
RF INPUT (dBm)
MOTOROLA ANALOG IC DEVICE DATA