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參數資料
型號: LA1784M
元件分類: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝: QIP-64
文件頁數: 28/50頁
文件大小: 568K
代理商: LA1784M
No. 6039-34/50
LA1784M
Detector output Pin 36 AC level
MPX OUT
R36-37
Vo
QDIN
Open
330 mVrms
235 mVrms
10 k
280 mVrms
200 mVrms
Band Muting Adjustment Procedure
The muting bandwidth can be modified as shown in figure 31 with the resistor RBW between pin 34 and 37.
6. AM
AM AGC system
The LA1784M RF AGC circuit takes its input from three sources: the WIDE AGC pin (pin 46), the MIDDLE
AGC pin (pin 49) and NARROW AGC. There is also an IF AGC circuit.
0
40
80
120
160
200
240
280
1.0
2
3
5
7
10
2
3
5
100
7
2
SA208
Sumida
Bandwidth
such
that
the
pin
33
voltage
≥2
V
kHz
Resistor RBW between pins 34 and 37 — k
37
36
35
34
+
1
F
0.47
F
10 k
RBW
ANT IN 98 MHz 100 dB
Fig.31
RBW — Muting Bandwidth
+
62
46
57
49
RF
52
31
+
48
44
42
RW
1st MIX 10.7MHz CF
2nd MIX 450kHz CF
IF Amp.
DET
1st OSC
X'tal
Middle AGC IN
Narrow AGC IN
Wide AGC IN
ANT
damping
RF AGC
47
F
3.3
F
Amp.
IF AGC
2.2
F
240 k
VCC
A11762
Fig. 32
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