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參數資料
| 型號： | LA4902 |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 10 W, 1 CHANNEL, AUDIO AMPLIFIER, DIP28 |
| 封裝： | 0.500 INCH, DIP-28 |
| 文件頁數： | 5/5頁 |
| 文件大小： | 79K |
| 代理商： | LA4902 |
LA1805
No.2887-5/14
720
730
740
750
760
770
780
790
800
Free-Running Frequency, fF -- kHz
Sep -- fF
Figure 8
Separation,
Sep
-
dB
ILA01939
10
20
30
40
50
0
60
C S
=430pF
510pF
LA1186N
LA1805
17
CS
470pF
3. Free-running frequency measurement and adjustment
Either of the following two methods is used to measure the
free-running frequency.
(1) Connect pin 13 to a frequency counter through the high
input impedance amplifier.
(2) Connect the connection point of the semifixed resistor
connected to pin 13 and the fixed resistor to a frequency
counter through the resistor of 240k
Ω or greater.
How the error changes with the resistor value is shown
in Figure 7.
When setting the free-running frequency, the following must be noted.
Apply a 10.7MHz 100dB
μ nonmodulation carrier as IF input signal and set to 76kHz±50Hz with the tuning
indicator lighted.
4. Separation setting capacitor Cs
The separation characteristic for the LA1805 alone
(IF input) differs from that for the antenna input
with a front end. This difference is caused by the
characteristics of the front end and ceramic filter.
Shown right is how the separation characteristic
changes with the separation setting capacitor value
when the LA1186N is used as front end. Referring
to this separation characteristic, choose the
optimum separation for your set model.
LA1805
VCC
to counter
Figure 5
ILA01936
13
LA1805
RX
240kΩ min
to counter
Figure 6
ILA01937
13
0
50
100
150
200
250
300
Resistor Value, RX -- kΩ
Δf -- RX
Figure 7
Measured
Error
,
Δ
f
-
%
ILA01938
--4
--3
--2
--1
0
--5
1
VCC=4.5V
IF input 100dB
μ
Nonmodulation
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