ML3371, ML3372
LANSDALE Semiconductor, Inc.
Figure 2. ML3372 Functional Block Diagram and Test Fixture Schematic
RF Input
RSSI Output
VCC = 4.0 Vdc
0.1
SqIn
FilterOut
FilterIn
51 k
C1
0.01
51
1.0
µF
Mute
510 k
470
0.01
8.2 k
10
Filter –
Amp
+
9
AF
Amp
AF Out
to Audio
Power Amp
1.0
µF
16
15
14
13
12
11
Squelch Trigger
with Hysteresis
Demodulator
Mixer
10
Limiter
Amp
53 k
Oscillator
1
15
2
3
4
5
R10
1.8 k
0.33
0.001
muRata
CFU455D2
or
equivalent
C15
0.1
6
C13
0.1
R11
51 k
7
C14
27
8
57.6575
MHz
22
C12
0.1
R12
4.3 k
Ceramic
Resonator
muRata
CDB455C16
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