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LA7566 Datasheet(PDF) 8 Page - Sanyo Semicon Device |
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LA7566 Datasheet(HTML) 8 Page - Sanyo Semicon Device |
8 / 11 page No. 5764-8/11 LA7566 Continued from preceding page. Pin No. Symbol Pin function Equivalent circuit 11 12 VCO • VCO tank circuit used for video detection. See the separately provided documentation for the tank circuit coil (inductor) specifications. 13 14 VIDEO OUT EQ FILTER • Equalizer circuit. This circuit corrects 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 2.3 dB. When the frequency characteristics are corrected, connect an inductor, a capacitor, and a resistor in series between pin 14 and ground. The equalizer amplifier gain is given by: R1 AV = —— + 1 Z Here, R1 is an IC internal resistor with a value of 1 k Ω. Select Z according to the desired characteristics. However, care is required to prevent distortion at the resonant point determined by Z, where the gain is maximum. 15 16 PAL VIDEO IN NT VIDEO IN • Equalizer amplifier inputs. Pin 15 is for PAL, and pin 16 for NTSC format signals. These inputs are linked to and switched by the SIF switches. 17 APC FILTER • PLL detector APC filter connection. The APC time constants are switched internally in the IC. When locked, the VCO is controlled over the path A, and the loop gain is reduced. When unlocked and during weak field reception, the VCO is controlled over the path B, thus increasing the loop gain. We recommend values of: R = 150 to 390 Ω, and C = 0.47 µF for the loop filter constants. Continued on next page. |
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