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TDA4651WP Fiches technique(PDF) 9 Page - NXP Semiconductors |
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TDA4651WP Fiches technique(HTML) 9 Page - NXP Semiconductors |
9 / 15 page August 1993 9 Philips Semiconductors Preliminary specification Multistandard colour decoder with negative colour difference output signals TDA4651 Notes to the characteristics 1. With 20 mV, 3 dB decrease of the output signal is allowed. The level shift at demodulated f0 relative to blanking level is less than 5 mV. 2. Burst key width for PAL 4.3 µs, for NTSC 3.6 µs Burst width for PAL and NTSC 2.25 µs, ratio burst chrominance amplitude 1/2.2. 3. For the SEC+AM standard, amplitude and H/2 ripple content of the CD signals (R −Y) and (B−Y) depend on the characteristics of the external tuned circuit at pins 7 to 10. The resonant frequency of the external tuned circuit must be adjusted such that the demodulated fo voltage level is zero in the −(B−Y) output channel at pin 3. Now it is possible to adjust the quality of the external circuit such that the demodulated fo voltage level is zero in the −(R−Y) output channel at pin 1. If necessary, the fo voltage level in the −(B−Y) output channel must be readjusted to zero by the coil of the tuned circuit. The external capacitors at pins 2 and 4 (each 220 pF) are matched to the internal resistances of the de-emphasis network such that every alternate scanned line is blanked. 4. Pin 17 open-circuit; proportional to supply voltage. 5. The fo frequencies of the 8.8 MHz crystal at pin 21, and the 7.2 MHz crystal at pin 19, can be adjusted when the voltage at pin 17 is less than 0.5 V (burst OFF), thus providing double subcarrier frequencies of the chrominance signal. 6. Switching voltages for chrominance filters and crystals: at pin 28 for PAL at pin 27 for SECAM at pin 26 for NTSC (3.58 MHz) at pin 25 for NTSC (4.43 MHz). 7. The inquiry sequence for the standard is: PAL - SECAM - NTSC (3.58 MHz) - NTSC (4.43 MHz). PAL has priority with respect to SECAM, etc. 8. The super sandcastle pulse is compared with three internal threshold levels which are proportional to VP. Table 1 Specification of quartz crystals in HC-49/U13 holder; standard application. SYMBOL PARAMETER VALUE UNIT 43221430405 43221430418 fn nominal frequency 8.867238 7.159090 MHz CL load capacitance 20 pF ∆f n adjustment tolerance of fn at +25 °C ±40 ppm Rdld max in the drive level range between 10−12 W and 1.0 × 10−3 W, the resonance resistance may not exceed (at +25 °C) the value of Rdld max 100 50 Ω Rn resonance resistance of unwanted response 2Rr (+25 °C) Ω C1 motional capacitance ( ±20%) 22 19.5 fF C0 parallel capacitance ( ±20%) 5.5 4.4 pF T operating temperature range −10 to +60 °C ∆fn frequency tolerance over temperature range ±25 ppm Rr maximum resonance resistance over temperature range 60 Ω |
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