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SAA4963 Datasheet(PDF) 5 Page - NXP Semiconductors |
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SAA4963 Datasheet(HTML) 5 Page - NXP Semiconductors |
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5 / 20 page  1997 Mar 03 5 Philips Semiconductors Preliminary specification Integrated NTSC comb filter SAA4963 FUNCTIONAL DESCRIPTION Functional requirements The NTSC comb filter processes the video standard NTSC M. For SVHS signals the input signals are bypassed to the output without processing by selecting the SVHS mode. A sync separation circuit is incorporated to generate control signals for the internal clock processing. With a sync compression of up to 12 dB (see Fig.5) the sync separator works properly. The IC is controlled via the pin SVHS (pin 2) which forces the IC into the SVHS mode (bypass) if the comb filter function is not desired. It is possible to select the following modes: COMB-mode: Luminance and chrominance comb filter function active, if SVHS mode not active SVHS-mode: No IC function active, all clocks inactive, Cext (pin 7) is bypassed to CO (pin 9) and Yext (pin 14) is bypassed to YO (pin 11). This mode is forced via SVHS (pin 2). The mode changes from SVHS to COMB and vice versa are always performed asynchronously with respect to the vertical blanking interval. Pin description FSC (PIN 1) Input for the reference frequency fsc (see note 3 of Chapter “Characteristics”). For SVHS signals the signal performance can be increased by switching the input signal at FSC off. SVHS (PIN 2) Input signal that controls the operation mode. An internal low-pass filter suppresses the subcarrier frequencies. Thus applications are supported where the operation mode (COMB or SVHS) is controlled by the DC level of the FSC input signal at pin 1. For those applications the SVHS input can be externally connected to FSC (pin 1). Table 1 SVHS function SVHS SELECTED MODE LOW COMB HIGH SVHS (PLL and clock processing stopped) The PLL and the clock processing are always stopped if the selected level for SVHS is applied to SVHS (independent of the vertical pulse). VCCA,VCCO,VDDD AND VCCPLL (PINS 4, 6, 15 AND 18) Supply voltages. AGND, OGND, DGND AND PLLGND (PINS 5, 8, 16 AND 17) Ground connection. AGND is used as signal reference for all analog input and output signals. Cext (PIN 7) Input for an external chrominance signal which is correlated with the external VBS signal in SVHS-mode. CO (PIN 9) Chrominance output signal. This output delivers the comb filtered chrominance from the CVBS signal in COMB-mode or the external chrominance signal from the input Cext if the IC is forced into the SVHS-mode. In COMB-mode the output is delayed by an additional processing delay. Table 2 CO output signal REFDL (PIN 10) Decoupling capacitor for the delay line reference voltage. YO (PIN 11) VBS output signal. This output delivers the comb filtered luminance signal (including synchronization pulses) in COMB-mode or the external (C)VBS signal from the input Yext if the IC is forced into SVHS-mode. In COMB-mode the output is delayed by an additional processing delay. Table 3 YO output signal MODE CO OUTPUT SIGNAL COMB comb filtered chrominance signal SVHS external chrominance signal from Cext input MODE YO OUTPUT SIGNAL COMB comb filtered luminance signal SVHS external (C)VBS signal from Yext input |
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