поискавой системы для электроныых деталей |
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ADV453 датащи(PDF) 9 Page - Analog Devices |
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ADV453 датащи(HTML) 9 Page - Analog Devices |
9 / 12 page ADV453 REV. B –9– Figure 5. RGB Video Output Waveform Table V. Video Output Truth Table IOR, IOB, DAC Description IOG mA1 mA SYNC BLANK Input Data White Level 26.67 19.05 1 1 FFH Video Video + 9.05 Video + 1.44 1 1 Data Video to Blank Video + 1.44 Video + 1.44 0 1 Data Black Level 9.05 1.44 1 1 00H Black to Blank 1.44 1.44 0 1 00H Blank Level 7.62 0 1 0 XXH SYNC Level 0 0 0 0 XXH NOTE 1Typical with full Scale IOG = 26.67 mA. V REF = 1.235 V, RSET = 280 Ω, I SYNC connected to IOG. PC BOARD LAYOUT CONSIDERATIONS The ADV453 is optimally designed for lowest noise perform- ance, both radiated and conducted noise. To complement the excellent noise performance of the ADV453, it is imperative that great care be given to the PC board layout. The layout should be optimized for lowest noise on the ADV453 power and ground lines. This can be achieved by shielding the digital in- puts and providing good decoupling. The lead length between groups of VAA and GND pins should by minimized so as to minimize inductive ringing. Ground Planes The ground plane should encompass all ADV453 ground pins, voltage reference circuitry, power supply bypass circuitry, the analog output traces and all the digital signal traces leading up to the ADV453. Power Planes The PC board layout should have two distinct power planes, one for analog circuitry and one for digital circuitry. The analog power plane should encompass the ADV453 (VAA) and all asso- ciated analog circuitry. This power plane should be connected to the regular PCB power plane (VCC) at a single point through a ferrite bead, as illustrated in Figure 6. This bead should be lo- cated within three inches of the ADV453. The PCB power plane should provide power to all digital logic on the PC board, and the analog power plane should provide power to all ADV453 power pins, voltage reference circuitry and any output amplifiers. The PCB power and ground planes should not overlay portions of the analog power plane. Keeping the PCB power and ground planes from overlaying the analog power plane will contribute to a reduction in plane-to-plane noise coupling. |
Аналогичный номер детали - ADV453_15 |
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Аналогичное описание - ADV453_15 |
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