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TDA4657 Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA4657 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 17 page June 1993 10 Philips Semiconductors Preliminary specification Generic multi-standard decoder TDA4657 Notes to the characteristics 1. Burstkey width 4.3 µs. Burst width 2.25 µs, ratio burst chrominance amplitude 1/2.2. 2. At nominal phase of hue control. 3. V (p-p) of signal divided by 6 times effective noise voltage. 4. H/2 blanking alternately every second line. 5. These pins are leakage current sensitive. Pin 4 for (B −Y) Channel, pin 8 for (R−Y) Channel. 6. Within 2 dB output voltage deviation. 7. This pin is leakage current sensitive. 8. IC only. 9. Depends also on network on pin 15. 10. Pin 19 for PAL, pin 18 for SECAM, pin 17 for NTSC 4.43 MHz. Threshold levels are dependent of supply. 11. The field interval of the sandcastle has to be adapted to the ICs TDA2579B and TDA4690. The thresholds are independent of supply voltage. 12. System scanning sequence: PAL, SECAM, NTSC 4.4. Sandcastle pulse detector (pin 20; note 11) C20 input capacitance −− 10 pF V20 thresholds for field and line pulse pulse ON 1.3 1.6 1.9 V separation pulse OFF 1.1 1.4 1.7 V line pulse separation pulse ON 3.3 3.6 3.9 V pulse OFF 3.1 3.4 3.7 V burst pulse separation pulse ON 5.3 5.6 5.9 V pulse OFF 5.1 5.4 5.7 V System control processing (note 12) td system hold delay in event of a signal disappearing for a short time 2 − 3 field periods colour killer; colour ON delay switching occurs during field blanking 2 − 3 field periods colour OFF delay 0 − 1 field periods ts scanning time for each system − 4 − field periods QUALITY SPECIFICATION: URV-4-2-59/601 SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT |
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