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參數資料
| 型號： | LA7583 |
| 元件分類： | 接收器 |
| 英文描述： | AUDIO/VIDEO DEMODULATOR, PDIP24 |
| 封裝： | SDIP-24 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 201K |
| 代理商： | LA7583 |
Continued from preceding page.
Pin
No.
Symbol
Circuit Configuration
Description
24
SIF INPUT, J/U SW
Pin 24 is used both for SIF input and J/U
SW audio mute.
.
The input impedance is approximately
1.5 k
.
J/U (Japan/U.S.) switch
The oscillating frequency for VCO2 in
Japan and the U.S. differs. However, the
center frequency of the SIF detector is
controlled using VCO2 as a reference. As
a result, the filter control mode can be
changed either by leaving this pin open or
dropping it to GND through a 3.9 k
resistor.
Open: Japan mode
3.9 k
: U.S. mode
.
Audio mute:
Audio muting can be applied by dropping
the voltage on this pin to 0.5 V or less.
LA7583 VCO COIL design considerations
1. Design criteria
Allow for an adequate variable range for the IF frequency in the design. Specifically, select a coil value so that the carrier
frequency is roughly in the center of the characteristics diagram shown below when 2 V and 4 V are applied to pin 22.
2. Design notes
a. When selecting the L value, the LA7583 must be soldered directly on the board. If an IC socket is used, an error in the VCO
center frequency will arise from the capacitance of the socket.
b. The patterns for pins 13 and 14 must be made as short as possible (15 mm or less). Minimize the effect of the printed
pattern.
c. A VCO coil of which tolerance is ± 5% must be used.
3. Measuring the IF frequency range
Drop the IF AGC (pin 4) to GND. Next, pick up the VCO carrier leak at a pin other than the VCO coil (pins 13 and 14) and
read the carrier frequency. And then, apply a voltage ranging from 1.5 V to 4.5 V to pin 22, and record the characteristics of the
maximum variable frequency range for VCO as shown in the diagram below.
4. Recommended VCO coil
A. Tokyo Parts Industry Co., Ltd.
5LC
JAPAN
1.2 H ± 5%
U.S.
1.8 H ± 5%
US fO : 45.75 MHz
JAPAN fO : 58.75 MHz
Y22–V
f O
–
MHz
f O
–
MHz
LA7583
No.5177-13/16
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA7590 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| LA7600 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LA7601 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| LA7601W | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| LA7605 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述: |
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