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LA7567N Datasheet(PDF) 10 Page - Sanyo Semicon Device |
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LA7567N Datasheet(HTML) 10 Page - Sanyo Semicon Device |
10 / 14 page No. 5765-10/14 LA7567N, 7567NM Continued from preceding page. Pin No. Pin Description Equivalent circuit 10 Composite video output • Output for the video signal that includes the SIF carrier. A resistor must be inserted between pin 10 and ground to acquire adequate drive capability. R ≥ 300 Ω 11 12 VCO tank • VCO tank circuit used for video signal detection. See the coil specifications provided separately for details on the tank circuit. This VCO is a vector synthesis VCO. 13 AFT OUTPUT • AFT output. The AFT center voltage is generated by an external bleeder resistor. The AFT gain is increased by increasing the resistance of this external bleeder resistor. However, this resistor must not exceed 390 k Ω. This circuit includes a control function that controls the AFT voltage to naturally approach the center voltage during weak field reception. 14 RF AGC OUTPUT • RF AGC output. This output controls the tuner RF AGC. A protective 100- Ω resistor is inserted in series with the open collector output. Determine the external bleeder resistor value in accordance with the specifications of the tuner. 15 1st SIF INPUT • First SIF input. A DC cut capacitor must be used in the input circuit. • If a SAW filter is used: The first SIF sensitivity can be increased by inserting an inductor between the SAW filter and the IC to neutralize the SAW filter output capacitance and the IC input capacitance. • When used in an intercarrier system: This pin (pin 15) may be left open. Continued on next page. |
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