參數(shù)資料
型號(hào)： MC3372D
廠商： MOTOROLA INC
元件分類： 接收器
英文描述： LOW POWER FM IF
中文描述： FM, AUDIO SINGLE CHIP RECEIVER, PDSO16
封裝： PLASTIC, SO-16
文件頁(yè)數(shù)： 12/20頁(yè)
文件大小： 471K
代理商： MC3372D
MC3371 MC3372
12
MOTOROLA ANALOG IC DEVICE DATA
An external positive bias to Pin 12 sets up the squelch
trigger circuit such that the audio mute (Pin 14) is open or
connected to ground. If Pin 12 is pulled down to 0.9 V or
below by the noise or tone detector, Pin 14 is internally
shorted to ground. There is about 57 mV of hyteresis at
Pin 12 to prevent jitter. Audio muting is accomplished by
connecting Pin 14 to the appropriate point in the audio path
between Pin 9 and an audio amplifier. The voltage at Pin 14
should not be lower than –0.7 V; this can be assured by
connecting Pin 14 to the point that has no dc component.
Another possible application of the squelch switch may
be as a carrier level triggered squelch circuit, similar to the
MC3362/MC3363 FM receivers. In this case the meter
output can be used directly to trigger the squelch switch
when the RF input at the input frequency falls below the
desired level. The level at which this occurs is determined
by the resistor placed between the meter drive output
(Pin 13) and ground (Pin 15).
Figure 11. Typical Application for MC3371 at 10.7 MHz
–
10
C7
0.022
VR1 (Squelch Control)
10 k
VR2
10 k
AF Out
to Audio
Power Amp
3.3 k
R8
C10
68
10.245
MHz
L1
TKANS9443HM
6.8
μ
H
±
6%
D1
+
1N5817R5
R6
4.7 k
560
R7
R9
510 k
4.7 k
10
53 k
51 k
+
8.2
μ
H
L2
1st IF 10.7 MHz
from Input
Front End
+
T2: Toko
2A6597 HK (10 mm)
or
7MC–8128Z (7 mm)
VCC = 4.0 Vdc
RSSI Output
R2
10 k
C8
0.22
R11
560
C9
10
R1
51 k
C1
0.01
C17
0.1
C3
0.1
C4
0.001
C5
0.001
C11
220
C13
0.1
R10
39 k
C14
0.1
14
13
15
16
12
11
9
2
4
3
8
5
6
7
1
Oscillator
muRata
CFU455D2
or
equivalent
Demodulator
Filter
Amp
Mixer
Squelch Trigger
with Hysteresis
AF
Amp
Limiter
Amp
1.8 k
C12
0.1
C2
4.7
μ
F
C15
91
R3
100 k
R4
1.0 k
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