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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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TDA8501 Datenblatt(PDF) 9 Page - NXP Semiconductors |
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TDA8501 Datenblatt(HTML) 9 Page - NXP Semiconductors |
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9 / 30 page  April 1993 9 Philips Semiconductors Preliminary specification PAL/NTSC encoder TDA8501 Fig.7 Band pass filter nominal frequency response (NTSC mode). Fig.8 Band pass filter nominal frequency/group delay response (NTSC mode). (1) frequency response. (2) group delay. Y +SYNC, CVBS AND CHROMINANCE OUTPUTS The Y signal from the matrix, or the Y signal from pin 5, (selected via the switch) is added with the composite sync signal of the sync separator (dependent on pin 17 conditioning). The output of the adder, nominal 1 V (peak-to-peak), is connected to pin 22 (see Fig.1). Pin 22 is connected to an external delay line. The delay line is necessary for correct timing of the Y + SYNC signal with the chrominance signal. The output resistor of the delay line is connected to VREF (pin 13). The output of the external delay line is connected to (input) pin 20. The Y +SYNC (delayed) input signal at pin 20 is amplified via a buffer to a level of 2 V (peak-to-peak) nominal and connected to pin 19 (Y + SYNC output). The Y + SYNC (delayed) input signal at pin 20 is also connected via an internal resistor of 2 k Ω to the input of the CVBS adder stage. After the internal resistor of 2 k Ω, and before the input of the CVBS adder, an external notch filter can be connected via pin 18. The chrominance output of the bandpass filter is added with Y +SYNC signal via the CVBS adder. The CVBS (combined video and blanking signal) output of the adder is connected to pin 16 with a nominal amplitude of 2 V (peak-to-peak). The chrominance output of the bandpass filter is amplified via a buffer and connected to pin 14. The chrominance amplitude corresponds with the value of Y + SYNC signal output at pin 19. Together both outputs give the Y +C (SVHS) signals. BLACK AND BLANKING LEVELS IN PAL AND NTSC MODES PAL mode: Fig.9 illustrates the nominal Y + SYNC signal at pin 22, the difference between black and blanking level is 0 mV. NTSC mode: Fig.10 illustrates the nominal Y + SYNC signal at pin 22, the difference between black and blanking level is 53 mV. Because of the difference between the black and blanking level in the NTSC mode, there are two options for NTSC. |
Ähnliche Teilenummer - TDA8501 |
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Ähnliche Beschreibung - TDA8501 |
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