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参数资料
| 型号： | LA1235 |
| 元件分类： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 9/13页 |
| 文件大小： | 289K |
| 代理商： | LA1235 |
LA1235
No. 873- 5/13
100
Table for muting adjustable lower limit calculation
Muting sensitivity, Input -- dB
μ R205 -- kΩ
JK123505
80
70
60
50
40
2
3
5
7
30
160
120
80
40
0
10
2nd quadrant
I 16
--
μ
A
R
204
=
20k
Ω
50k
Ω
100k
Ω
Muting
sensiti
vity
,Input
-
-dB
μ
JK123506
30
40
50
60
70
100
80
Muting Sensitivity Characteristic
R204 -- kΩ
3
5
7
10
2
3
5
7
R205 = 33kΩ
Muting
of
f
on
56k
Ω
100k
Ω
1st quadrant
Sample
of
standard
I
16
Sample
of
small
I
16
Setting of muting circuit constants
Drive current to be output at muting drive output pin 12 is
0.75mA typ., but approximately 0.4mA may be caused by
variations in characteristic or changes in temperature (smaller
at higher temperatures). It is desirable to design the circuit so
that the total current to be output from pin 12 at the time of
muting ON does not exceed 0.35mA. When driving the muting
circuit of the LA1235, the muting drive current (input current
at pin 5) must be considered besides this total output current.
The muting drive current of the LA1235 is 0.2mA max.
Thus, the muting constants are obrained as follows. If the
muting drive current is IR207 ≥ 0.2mA, R207 ≤ 14kΩ occurs
and the total current It is shown by the following expression.
10k
Ω
1.4V
6.2V
R207
R206
IR207
IR206
12
5
LA1235
Muting Circuit
6.2V
4.8V
It = IR206+IR207 =
R206
+
R206+10kΩ
(10k
Ω : Input resistance at pin 5, Refer to the above figure.)
If R207 = 10kΩ is taken with the variation s in voltage V12 at pin 12 and input resistance 10kΩ at pin 5 considered,
R206 ≈ 56.4kΩ is obtained, and then R206 = 68kΩ and R207 = 10kΩ are obtained.
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