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參數資料
| 型號： | LA75520K |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| 封裝： | 0.300 INCH, DIP-24 |
| 文件頁數： | 12/12頁 |
| 文件大小： | 134K |
| 代理商： | LA75520K |
LA75520K
No.A0648-9/12
Continued from preceding page.
Pin No.
Pin name
Function
Equivalent Circuit
7
9
SIF SYSTEM SW A
SIF system selection switch pins. Combining the
settings of these two pins supports four systems.
In M/N mode, the audio output level is increased by
6dB.
The internal trap is also linked to these switches.
The truth-values are as follows.
Pin7
Pin9
MODE
H
B/G
H
L
I
L
H
D/K
L
M/N
7
9
1k
Ω
1k
Ω
50k
Ω
50k
Ω
80k
Ω
80k
Ω
1k
Ω
1k
Ω
30k
Ω
30k
Ω
8
APC FILTER
PLL APC filter connection pin. The APC count is
switched internally in the IC.
The VCO is normally controlled by route A.
When unlocked and during weak field reception, the
VCO is controlled by route B and the loop gain is
increased.
For this APC filter we recommend a resistor of 51
Ω
and capacitor of 0.47
μF.
The buzz characteristics can be improved by
connecting a capacitor of 100pF or so between pins
5 and 8.
8
1k
Ω 1kΩ
from
APC
DET
A
B
10
VIF FREQUENCY
SW
Switch pin for selecting the IF frequency
When this pin is open, 1/2VCC exists.
VCC : 39.5MHz
Open : 38.9MHz
GND : 38.0MHz
10
11k
Ω
50k
Ω
50k
Ω
11
REFERENCE CP
INPUT
Reference signal input pin necessary for adjusting
the internal sound carrier trap, AFT, etc.
Either 4.0 or 4.43 MHz can be selected. Use the
configuration shown in example 1 when using
4.43MHz and configuration shown in example 2
when using 4.0MHz.
Since no oscillator can be configured simply by
connecting the X’tal resonator to pin 11, input the
reference signal from an external source without
fail.
11
1000pF
4.43MHz
Example 1
Example 2
11
1000pF
4.0MHz
270k
Ω
11
200k
Ω
Continued on next page.
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