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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(jī)/VCR應(yīng)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(yīng)力強(qiáng)度因子）電路電視/錄像機(jī)使用（用于電視機(jī)/錄像機(jī)應(yīng)用的中頻信號處理（資料表格強(qiáng)度因子）電路） |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 187K |
| 代理商： | LA7555 |
LA7555
No.2927–7/11
7. AFT
As shown in Fig.7-1, the AFT is a balanced-type using a quadrature detection circuit. The input signal is shifted
90
°
by the internal capacitor and external phase shifter, and quadrature-detected. Pin 14 is also used as the AFT
Defeat pin. Fig.7-1
Fig.7-1
C2 forms a sound trap for preventing malfunction of the AFT.
8. SIF limiting amplifier
As shown in Fig.8-1, the SIF limiting amplifier is an unbalanced limiting amplifier consisting of four stages
derectly connected. There is negative feedback within the IC to balance the differential amplifier.
Fig.8-1
9. Quadrature detection
SIF quadrature detection is by the single pin detector with internal phase shift capacitor, shown in Fig.9-1. FM
detection is by shifting the SIF signal 90
°
and multiplying it. The characteristics of the phase shifting circuit are as
follows :
1. Demodulation output .....mainly Q
L
2. Distortion ... linearity of phase shifting circuit, symmetry of S curve.
The linearity of the phase shifting circuit can be improved by lowering Q
L
and increasing the band with a single-
tuned circuit, but the FM detection output will drop.
Pin 2 is also used as the SIF mute pin.
Fig.9-1
10.Electronic volume control
As shown in Fig.10-1, this is an electronic volume control, having a control pin with high input impedance. The
attenuation curve is a logarithmic curve. The external audio input impedance is approximately 30k
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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