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參數(shù)資料
| 型號： | LA7555 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | IF Signal Processing (VIF+SIF) Circuit for TV / VCR Use(用于電視機/VCR應用的IF信號處理（VIF+SIF）電路) |
| 中文描述： | 中頻信號處理（資料表格應力強度因子）電路電視/錄像機使用（用于電視機/錄像機應用的中頻信號處理（資料表格強度因子）電路） |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 187K |
| 代理商： | LA7555 |
LA7555
No.2927–8/11
Fig.10-1
11.AF amplifier
As shown in Fig.11-1, this is an AF amplifier equipped with an NFB pin. An audio power amplifier can be easily
configured by use of this NFB pin. The gain of the power amplifier can be controlled by the ratio of R1 and R2.
Fig.11-1
VCO adjustment methods
The following two methods are available for adjusting the VCO.
1. APC voltage offset adjustment method
a. Connect a digital voltmeter to pin 20 (APC filter pin ) (Fig.1).
b. Lower the IF input level and connect the IF AGC (pin 13) to GND.
Measure the voltage on pin 20 at this time.
c. Raise the IF input level to the desired value. Free the IF AGC from GND (internal AGC). Adjust the VCO so
that the voltage (V2) on pin 20 is equal to V1.
Note : When adjusting by this method, use a DVM (digital voltme-
ter) with high input impedance. At Zi=10M
, the adjustment
error is approximately 20kHz, The error (
V) with the DVM
connected is.
V (mV)= V (1– )
The change in VCO free-running frequency (
f) according to
V is
f (kHz)=
V
× β
where
β
=VCO control sensitivity (kHz/mV)
R
Z+R
1
2. Direct reading method
a. Lower the IF input level and adjust the IF AGC (pin 13) to between GND and about 4V (VCO free run).
b. Monitor the carrier frequency leaking from pins other than the VCO coil, or pattern, chassis, and adjust the
VCO coil to obtain the desired frequency (fp).
Fig.1
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| LA75600VA | Monolithic Linear IC IF Signal Processing (VIF/SIF) IC for use in TV/VCR Applications |
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相關代理商/技術參數(shù) |
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|---|---|
| LA75600VA | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Linear IC IF Signal Processing (VIF/SIF) IC for use in TV/VCR Applications |
| LA7565B | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
| LA7565BM | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products |
| LA7565E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IF Signal-Processing IC for PAL/NTSC Multi-System Audio TV and VCR Products(292.33 k) |
| LA7565GM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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