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LA75676V-S Datasheet(PDF) 8 Page - Sanyo Semicon Device |
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LA75676V-S Datasheet(HTML) 8 Page - Sanyo Semicon Device |
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8 / 13 page  No. 6277-8/13 LA75676V-S Continued from preceding page. Pin No. Pin Function Equivalent circuit Equalizer circuit This circuit corrects the frequency characteristics of the video signal. Pin 8 is the input to the EQ amplifier. The EQ amplifier takes a 1.5 Vp-p video signal as its input and amplifies that to a 2.0 Vp-p level. • Notes on the equalizer amplifier design The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 2.3 dB. If frequency characteristics correction is required, insert the capacitor, inductor, and resistor between pin 7 and ground in series. • Using the equalizer amplifier If the input signal is vi and the output signal vo, then R1 —— +1 (Vi + Vin) = Vo × G Z G: Gain of the voltage follower amplifier Vin: Imaginary voltage G: About 2.3 dB Assuming Vin ≈ 0, then AV will be: VoG R1 AV = —— = —— + 1 Vi Z R1 is an IC internal 1 k Ω resistor. Simply select a value of Z according to the desired characteristics. However, note that the equalizer amplifier gain will be a maximum at the Z resonance, so care is required to prevent distortion from occurring. 6 7 8 EQ amp 6 7 8 2.2k Ω 200 Ω EQ INPUT EQ OUTPUT AGC C R L = Z 1k Ω A13272 A13273 PLL detector APC filter connection The APC time constant is switched internally by the IC. When locked, the VCO is controlled by the route A, and the gain is reduced. When unlocked or during weak field reception, the VCO is controlled by the route B, and the gain is increased. We recommend the following values for this APC filter: R = 150 to 390 Ω C = 0.47 µF. 9 APC filter 9 1k Ω 1kΩ 1kΩ A B FROM APC DET A13274 C + R Continued on next page. |
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