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U4935B Datasheet(PDF) 9 Page - TEMIC Semiconductors |
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U4935B Datasheet(HTML) 9 Page - TEMIC Semiconductors |
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9 / 16 page  U4935B Preliminary Information TELEFUNKEN Semiconductors Rev. A1, 28-Jan-97 9 (16) Demodulator The bell filter delivers the C signal via a limiter amplifier to the demodulator. The demodulator is of a phase-locked loop (PLL) type VCO and a phase-emitter coupled multivibrator with the limiter output and is fed back to the VCO. The free-running frequency is adjusted by charging or discharging the capacitor at Pin 8 during the vertical blanking and is held during scanning. Therefore, the IC needs no adjustment to enable constant operation The low-frequency de-emphasis is matched to the PLL and is controlled by the tuning voltage of the PLL. The capacitor, C8, should be connected as close as possible to the ground pin of the package. If this is not ensured, a black-level error for both channels may result. De– emphasis Limiter Tuning LPF VCO PLL VBLK pulse Bell-filter output C 8 PLL ref 8 to H, V blanking 9611721 Figure 18. Block diagram of the demodulator |
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