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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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SDA9588X Datenblatt(PDF) 11 Page - Micronas |
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SDA9588X Datenblatt(HTML) 11 Page - Micronas |
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11 / 87 page  SDA 9488X SDA 9588X System Description Micronas 4-11 Preliminary Data Sheet The clamping pulse can be shifted in position (CLMPIST) and length (CLMPID) to adjust to the specific application. The ADCs are driven by a 20.25 MHz free running crystal clock which is not related to the incoming CVBS signal. To avoid aliasing by subsampling the CVBS signal and the Y/C signals should be bandlimited to 10MHz. In the same manner the U/V signal frequency spectrum (SDA 9588X) should not exceed 5 MHz. The digital filtering suppresses all frequencies above the useable spectrum. 4.1.3 Automatic Gain Control To accommodate to different CVBS input voltages an automatic gain control has been implemented. The chip works correctly for input voltages in the range from 0.5 to 1.5Vpp. For best signal-to-noise ratio, the maximum CVBS amplitude is recommended if available. The AGC behavior can be chosen out of four possibilities (AGCMDE): The sync height serves as reference for the gain control in the typical application. When using overflow detection only, the gain is set to maximum and is reduced whenever an overflow occurs. This procedure will be executed again when a channel change is detected or the gain control is manually reset by AGCRES. Figure 4-2 AGC characteristic 4.1.4 Signal Magnitudes The nominal CVBS signal with 75% color has a magnitude of 1 Vpp. The upper headroom is left to permit signals with 100% color resulting in 1.23 Vpp. The Y signal must always contain the sync part. Its levels correspond to the CVBS levels except for the missing color and burst. After A/D conversion the video part is clamped to its black value and is amplified to 224 digital steps. The nominal signal levels ensure correct brightness and saturation. The YUV signal levels conform to the ITU 601 recommendation. 0 2 4 6 8 10 12 14 16 0 0.5 1 1.5 2 Automatic Gain Control Characteristic AGCVAL |
Ähnliche Teilenummer - SDA9588X |
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Ähnliche Beschreibung - SDA9588X |
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