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LA7567N Datasheet(PDF) 9 Page - Sanyo Semicon Device |
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LA7567N Datasheet(HTML) 9 Page - Sanyo Semicon Device |
9 / 14 page No. 5765-9/14 LA7567N, 7567NM Continued from preceding page. Pin No. Pin Description Equivalent circuit 6 7 8 EQ amp • Equalizer circuit. This circuit is used to correct the video signal frequency characteristics. Pin 17 is the EQ amplifier input. This amplifier amplifies a 1.5-V p-p video signal to 2-V p-p. • Notes on equalizer amplifier design The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 2.3 dB. When used for frequency characteristics correction, a capacitor, inductor, and resistor must be connected in series between pin 7 and ground. • Approach used in the equalizer amplifier If vi is the input signal and vo is the output signal, then: Where G is the voltage-follower amplifier gain. Assume: vin: Imaginary short G: About 2.3 dB vin ≈ 0. Then: • R1 is the IC internal resistance, and is 1 k Ω. In the application design, simply select Z to correspond to the desired characteristics. However, since the EQ amplifier gain will be maximum at the resonant point defined by Z, care is required to assure that distortion does not occur. 9 APC FILTER • PLL detector APC filter connection. The APC time constant is switched internally in the IC. When locked, the VCO is controlled by loop A and the loop gain is reduced. When unlocked and during weak field reception, the VCO is controlled by loop B and the loop gain is increased. For this APC filter we recommend: R = 150 to 390 Ω C = 0.47 µF R1 —— +1 (vi + vin) = Vo × G 2 voG R1 AV = —— = —— +1 vi Z Continued on next page. |
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