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參數資料
| 型號： | LA7555 |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| 封裝： | SDIP-24 |
| 文件頁數： | 7/11頁 |
| 文件大小： | 355K |
| 代理商： | LA7555 |
LA7555
No.2927–5/11
2. Video detector
As shown in Fig.2-1, the video detector is a PLL-type. AM detection (video detection) is by phase shifting the IF
signal and VCO output signal 180
° and multiplying the input signal. It offers excellent buzz and beat characteris-
tics as detection is by multiplication by a clean signal. Also, excellent detection characteristics are obtained in the
same manner for the overmodulation signal.
Fig.2-1
3. Video amplifier B/W noise canceller
As shown in Fig.3-1, the video amplifier amplifies the detection output voltage over a wide band to the desired
voltage (=2.2Vp-p). The amplified video signal passes through the B/W noise canceller and is output to pin 21.
White : The noise canceller operates as shown in Fig.3-3 as the input of noise exceeding the white level of the
video signal as shown in Fig.3-2 will cause noticeable noise on the screen.
Black : The noise canceller operates as shown in Fig.3-3 as the input of noise exceeding the sync signal tip as
shown in Fig.3-2 will prevent proper operation of the next-stage sync separation circuit.
Fig.3-2
Fig.3-3
Fig.3-1
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相關代理商/技術參數 |
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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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