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參數(shù)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(shù)： | 29/50頁 |
| 文件大?。?/td> | 568K |
| 代理商： | LA1784M |
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No. 6039-35/50
LA1784M
800
900
1000
60
80
70
90
100
1100
1200
AGC
on
level
Frequency — Hz
AM AGC f characteristics
Wide AGC
Operates for
wide band
interference
Wide AGC
Operates for wide
band interference
Middle AGC
Operates for
interference within
±70 kHz of the
received frequency.
Middle AGC
Operates for
interference within
±70 kHz of the
received frequency.
Narrow AGC
Operates at the
received frequency.
Fig.33
70
80
90
100
110
120
2
1.0
3
5
7
10
2
3
5
Received frequency:
1 MHz
Antenna
damping
on
input
level
—
dB
Pin 46 input — MHz
Wide Band AGC Circuit
30
0.022
F
0.022
F
0.022
F
46
50
510
50
–6dB
SG
ANTD
Fig.34
62
57
+
VCC
0.022
F
30
620
1MH
100
H
100
H
30MH
15
pF
15
pF
47
F
100
k
0.022
F
Wide band AGC adjustment resistor
A12084
FC18
The wide band AGC circuit in this IC has the frequency characteristics shown above. The pin 46 input frequency
characteristics are identical to those of the RF amplifier gate. This AGC circuit serves to prevent distortion at the
FET input when a strong signal is applied to the antenna circuit. The level at which the AGC circuit turns on can be
adjusted to an arbitrary level with the wide band AGC adjustment resistor. A delayed AGC on level can be handled
by reducing the value of the adjustment resistor.
Fig. 35
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| LA1787M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Single-Chip Tuner IC for Car Radios |
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