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參數(shù)資料
| 型號(hào)： | LA7555 |
| 元件分類(lèi)： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| 封裝： | SDIP-24 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 355K |
| 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 QL
2. Distortion ... linearity of phase shifting circuit, symmetry of S curve.
The linearity of the phase shifting circuit can be improved by lowering QL 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
Ω.
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| LA75600VA | 制造商:SANYO 制造商全稱(chēng):Sanyo Semicon Device 功能描述:Monolithic Linear IC IF Signal Processing (VIF/SIF) IC for use in TV/VCR Applications |
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| LA7565BM | 制造商:SANYO 制造商全稱(chēng):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(chēng):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(chēng):未知廠家 功能描述: |
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