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參數(shù)資料
| 型號： | LA7583 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | IF Signal Processing Circuit (A 2 C PLL VIF + SIF) for TVs and VCRs(用于電視機/VCR應(yīng)用的IF信號處理（自動調(diào)整控制 鎖相環(huán) VIF+SIF）電路) |
| 中文描述： | 中頻信號處理電路（2葷鎖相環(huán)資料表格應(yīng)力強度因子）的電視和錄像機（用于電視機/錄像機應(yīng)用的中頻信號處理（自動調(diào)整控制鎖相環(huán)資料表格強度因子）電路） |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 200K |
| 代理商： | LA7583 |
Continued from preceding page.
Pin
No.
24
Symbol
Circuit Configuration
Description
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
U.S.
1.2 μH ± 5%
1.8 μH ± 5%
US f
O
: 45.75 MHz
JAPAN f
O
: 58.75 MHz
Y22 – V
Y22 – V
f
O
–
f
O
–
LA7583
No.5177-13/16
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