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參數(shù)資料
| 型號： | LA1805 |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 226K |
| 代理商： | LA1805 |
LA1805
No.2887-4/14
How to use the LA1805
1. Forced monaural mode.
Figures 1 and 2 show how to cause the forced monaural mode to be entered.
(1) Connect pin 14 to VCC through a resistor of 100kΩ. (Turn ON the SW1 in Figure 1.)
(2) Connect pin 15 to GND through a resistor of 47k
Ω. (Turn ON the SW2 in Figure 2.)
Either above-mentioned (1) or (2) causes the forced
monaural mode to be entered. In this case, the VCO
does not stop operating. If the resistance of R1 and
R2 are decreased, internal bias will vary when the S1
or S2 is turned ON. This data is shown in Figure 3.
2. VCO Stop
The VCO is so designed as to stop automatically at the
AM mode.
(when pin 11 and pin 21 are at the same potential)
There is no pin available for stopping the VCO at the
FM mode. However, the method shown right can be
used to stop the VCO at the FM mode, causing the
forced monaural mode to be entered.
LA1805
15
14
+
S1
VCC
R1
100k
Ω
S1 on
ILA01932
LA1805
15
14
+
S2
R2
47k
Ω
S2 on
ILA01933
Figure 2 Forced Monaural Mode Setting Method
Figure 1 Forced Monaural Mode Setting Method
0
20
40
60
80
100
120
160
140
180
R1, R2 -- k
Ω
Forced Monaural Mode Setting Resistance
Free-Running Frequency
Free-running
Frequency
-
kHz
ILA01934
58
54
62
66
70
74
78
50
82
VCC=8V
S2 on
S1 on
Figure 3
LA1805
14
15
13
+
SW
47kΩ
Figure 4
ILA01935
Make the wiring as
short as possible.
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