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TDA8218 Datasheet(PDF) 6 Page - STMicroelectronics |
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TDA8218 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 9 page 11 Phase comparator output R5 R4 Vcc1 Figure 3 : Line Oscillator Line Flyback Sync pulse Output Current Vc Integrated Flyback Figure 4 : Phase Comparator 13 12 Vcc1 Vc SL2 ST1 Figure 5 The oscillator thresholds are internally fixed by resistors. The discharge of the capacitor depends on the internal resistor R4. The control voltage is applied on resistor R5. The sync-pulse drives the current in the compara- tor. The line flyback integrated by the external net work gives on pin 13 a saw tooth, the DC offset of this saw tooth is fixed by VC. The comparator output provides a positive current for the part of the signal on pin 13 greater than to VC and a negative current for the other part. When the line flyback and the video signal are synchronized, the output of the comparator is an alternatively negativeand positive current. The frame sync-pulse inhibits the compa- rator to prevent frequency drift of the line oscillator on the frame beginning. TDA8218 6/9 |
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