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AD9848AKST Datasheet(PDF) 27 Page - Analog Devices |
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AD9848AKST Datasheet(HTML) 27 Page - Analog Devices |
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27 / 32 page  REV. A AD9848/AD9849 –27– PxGA The PxGA provides separate gain adjustment for the individual color pixels. A programmable gain amplifier with four separate values, the PxGA has the capability to “multiplex” its gain value on a pixel-to-pixel basis (see Figure 17). This allows lower output color pixels to be gained up to match higher output color pixels. Also, the PxGA may be used to adjust the colors for white balance, reducing the amount of digital processing that is needed. The four different gain values are switched according to the “Color Steering” circuitry. Seven different color steering modes for different types of CCD color filter arrays are programmed in the AD9848/AD9849 AFE Register, ctlmode, at Address 0x06 (see Figures 16a to 16g for timing examples). For example, Mosaic Separate steering mode accommodates the popular “Bayer” arrangement of Red, Green, and Blue filters (see Figures 18a and 18b). COLOR STEERING CONTROL 4:1 MUX 3 GAIN0 GAIN1 GAIN2 GAIN3 PxGA PxGA STEERING MODE SELECTION 2 6 VD HD PxGA GAIN REGISTERS CONTROL REGISTER BITS D0–D2 SHP/SHD VGA CDS Figure 17. PxGA Block Diagram RGr RGr Gb B Gb B RGr RGr Gb B Gb B GAIN0, GAIN1, GAIN0, GAIN1... LINE0 GAIN2, GAIN3, GAIN2, GAIN3... LINE1 GAIN0, GAIN1, GAIN0, GAIN1... LINE2 CCD: PROGRESSIVE BAYER MOSAIC SEPARATE COLOR STEERING MODE Figure 18a. CCD Color Filter Example: Progressive Scan RGr RGr RGr R Gr RGr RGr RGr R Gr GAIN0, GAIN1, GAIN0, GAIN1... LINE0 GAIN0, GAIN1, GAIN0, GAIN1... LINE1 GAIN0, GAIN1, GAIN0, GAIN1... LINE2 CCD: INTERLACED BAYER EVEN FIELD VD SELECTED COLOR STEERING MODE Gb B Gb B Gb B Gb B Gb B Gb B Gb B Gb B GAIN2, GAIN3, GAIN2, GAIN3... LINE0 GAIN2, GAIN3, GAIN2, GAIN3... LINE1 GAIN2, GAIN3, GAIN2, GAIN3... LINE2 ODD FIELD Figure 18b. CCD Color Filter Example: Interlaced The same Bayer pattern can also be interlaced, and the VD selected mode should be used with this type of CCD (see Figure 18b). 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 more detailed information, see the PxGA Timing section. The PxGA gain for each of the four channels is variable from –2 dB to +10 dB, controlled in 64 steps through the serial interface. The PxGA gain curve is shown in Figure 19. PxGA GAIN REGISTER CODE 10 32 40 48 58 0 8 16 24 31 8 6 4 2 0 –2 (011111) (100000) Figure 19. PxGA Gain Curve |
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