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AD9949 Datasheet(PDF) 27 Page - Analog Devices |
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AD9949 Datasheet(HTML) 27 Page - Analog Devices |
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27 / 36 page  AD9949 Rev. B | Page 27 of 36 COLOR STEERING CONTROL 4:1 MUX GAIN0 GAIN1 GAIN2 GAIN3 PxGA PxGA STEERING MODE SELECTION VD HD PxGA GAIN REGISTERS CONTROL REGISTER BITS D0 TO D1 SHP/SHD VGA CDS 8 4:1 MUX 2 3 Figure 29. PxGA Block Diagram LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ... R R Gr Gr LINE1 LINE2 GAIN2, GAIN3, GAIN2, GAIN3, ... GAIN0, GAIN1, GAIN0, GAIN1, ... COLOR STEERING MODE: PROGRESSIVE R RGr Gr Gb B CCD: PROGRESSIVE BAYER Gb B Gb B Gb B Figure 30. CCD Color Filter Example—Progressive Scan The same Bayer pattern can also be interlaced, and the interlaced mode should be used with this type of CCD (see Figure 31). The color steering performs the proper multiplexing of the R, G, and B gain values (loaded into the PxGA gain registers) and is synchronized by the user with vertical (VD) and horizontal (HD) sync pulses. For timing information, see Figure 34. LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ... RR Gr Gr LINE1 LINE2 GAIN0, GAIN1, GAIN0, GAIN1, ... GAIN0, GAIN1, GAIN0, GAIN1, ... Gb Gb BB LINE0 GAIN2, GAIN3, GAIN2, GAIN3, ... LINE1 LINE2 GAIN2, GAIN3, GAIN2, GAIN3, ... GAIN2, GAIN3, GAIN2, GAIN3, ... COLOR STEERING MODE: INTERLACED Gb Gb BB Gb Gb BB Gb Gb BB RR Gr Gr RR Gr Gr RR Gr Gr EVEN FIELD ODD FIELD CCD: INTERLACED BAYER Figure 31. CCD Color Filter Example—Interlaced Readout A third type of readout uses the Bayer pattern divided into three different readout fields. The 3-field mode should be used with this type of CCD (see Figure 32). The color steering performs the proper multiplexing of the R, G, and B gain values (loaded into the PxGA gain registers) and is synchronized by the user with vertical (VD) and horizontal (HD) sync pulses. For timing information, see Figure 35. LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ... R Gr LINE1 LINE2 GAIN2, GAIN3, GAIN2, GAIN3, ... GAIN0, GAIN1, GAIN0, GAIN1, ... LINE0 GAIN2, GAIN3, GAIN2, GAIN3, ... LINE1 LINE2 GAIN0, GAIN1, GAIN0, GAIN1, ... GAIN2, GAIN3, GAIN2, GAIN3, ... COLOR STEERING MODE: THREE FIELD Gb B Gb B R Gr FIRST FIELD SECOND FIELD CCD: 3-FIELD READOUT LINE0 GAIN0, GAIN1, GAIN0, GAIN1, ... R Gr LINE1 LINE2 GAIN2, GAIN3, GAIN2, GAIN3, ... GAIN0, GAIN1, GAIN0, GAIN1, ... R Gr THIRD FIELD Gb B Gb B R Gr R Gr Gb B R Gb Gb R R R Gb Gb R R Gb Gb Gb B Gr B B Gr Gr Gr B B Gr Gr B B Figure 32. CCD Color Filter Example—Three-Field Readout |
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