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LA75520KVA Datasheet(PDF) 8 Page - Sanyo Semicon Device |
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LA75520KVA Datasheet(HTML) 8 Page - Sanyo Semicon Device |
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8 / 12 page  LA75520KVA No.A0654-8/12 Pin Functions Pin No. Pin name Function Equivalent Circuit 1 DE-EMPHASIS C De-emphasis capacitor connection pin This is used to switch the equivalent resistance (5k Ω or 7.5kΩ) internally in the IC to select the time constant. This switching is linked to the SIF input switch. To disable de-emphasis, disconnect the capacitor. Connection of an external capacitance of 0.01 μF enables switching between 50 and 75 μs. When the FM detector circuit is not to be used, the FM VCO can be stopped by connecting it to ground with a resistor of 1k Ω or less. 1 4k Ω 0.01 μF 2 SIF AGC FILTER AGC filter pin for SIF carrier 0.01 μF is recommended for C1. 2 2k Ω C1 3 FM PLL FILTER PLL filter pin of FM detector This is used to configure an external lag lead filter. Example: Connect 330pF in parallel with the filter on the left (0.033 μF + 3.3kΩ). 3 0.033 μF 3.3k Ω 330pF 3 8k Ω 4 VCC Power supply 5 6 EQ OUT EQ FILTER Equalizer circuit. This circuit is used to correct the video signal frequency characteristics. Notes on equalizer amplifier design • The equalizer amplifier is designed as a voltage follower amplifier with a gain of about 0 dB. When used for frequency characteristics correction, a capacitor, inductor, and resistor must be connected in series between pin 6 and ground. Equalizer amplifier gain AV = R1 Z + 1 R1 is the IC internal resistance, and is 1k 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. 6 R1:1k Ω 5 2k Ω C L R Z Continued on next page. |
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