Datenblatt-Suchmaschine für elektronische Bauteile |
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BA7149 Datenblatt(PDF) 5 Page - Rohm |
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BA7149 Datenblatt(HTML) 5 Page - Rohm |
5 / 7 page 5 Video ICs BA7149F 16pin 2pin 16pin 500 20k 12pin 20k Fig.11 15pin 12pin 10k 15pin 2k 2k 2.8V 10k 10k 12k V + Fig.10 •Circuit operation Input signals 63.556 µ H Pulse only 0.29V at 11pin adj.at 11pin 4.7 µ 262.5H 16.683m V Pulse only H Pulse only Pulse IH Pulse IS Pulse IV IH Fig.12 The video signal input to pin 11 is detected by the charg- ing and discharging of an external capacitor. Sync sepa- ration is done in the SYNC SEPA block. The H. SYNC signal is sent to the H. OSC, and the V. SYNC signal is sync-separated in the vertical sync pulse interval and sup- plied to the V. OSC block. The H. OSC block consists of a PLL that oscillates in sync with the sync-separated H. SYNC signal, and outputs the HD pulse and horizontal deflection pulse. In the V. OSC block, a direct-control method is used with the sync signal. To synchronize the vertical oscillator cir- cuit, the inherent oscillation period of the oscillation circuit is made slightly larger than the vertical sync signal period, so that the sync signal always enters slightly early. The oscillator output alone is not enough to ensure stable operation for the vertical deflection output circuit, so it is amplified by the V. DRIVE block. The horizontal and vertical blanking signals generated in the H. OSC and V. OSC blocks are used to erase the hor- izontal retrace line from the video signal input to pin 11. The signal is inverted and amplified by a 6dB inverting amplifier and output as a negative-polarity video signal. |
Ähnliche Teilenummer - BA7149 |
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Ähnliche Beschreibung - BA7149 |
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