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OV9120 Datasheet(PDF) 7 Page - OmniVision Technologies, Inc. |
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OV9120 Datasheet(HTML) 7 Page - OmniVision Technologies, Inc. |
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7 / 24 page  DATASHEET OV9620/OV9120 Datasheet Doc #DS102 © OmniVision Technologies Inc., 2002, version 2.0 Page 6 Function Descriptions This section describes the functions of the OV9620/9120. Figure 3. OV9620/OV9120 Block Diagram Timing Generator and Control Logic Image Array (1312 X 1036) Column Sample/Hold AMP Channel Balance 10bit A/D SCCB Slave Interface Control Register Bank Gain Control Balance Control PLL D[9:0] PCLK HREF HSYNC VSYNC Image Capture and Processing Flow The OV9620/OV9120 CameraChip is a 1/2-inch format CMOS imaging device. The sensor contains 1,359,232 pixels. Figure 4 shows the color filter layout. Figure 4. Sensor array region color filter layout R G R G R G R G R G R G G B G B G B G B G B G B R G R G R G R G R G R G G B G B G B G B G B G B R G R G R G R G R G R G G B G B G B G B G B G B R G R G R G R G R G R G G B G B G B G B G B G B R G R G R G R G R G R G G B G B G B G B G B G B R G R G R G R G R G R G G B G B G B G B G B G B R G R G R G R G R G R G G B G B G B G B G B G B 0 1 2 3 4 5 6 7 8 9 10 11 1035 1034 1033 Column dummy dummy dummy dummy dummy dummy Optical black dummy dummy dummy dummy 1032 R o w The color filters are Bayer pattern. The primary color BG/GR ar- ray is arranged in line-alternating fashion. Of the 1,359,232 pixels, 1,310,720 are active. The other pixels are used for black level calibration and interpolation. The sensor array design is based on a field integration read-out system with line-by-line transfer and an electronic shutter with a synchronous pixel read-out scheme. When the column sample/hold circuit has sampled one row of pixels, the pixel data will shift out one-by-one into an analog amplifier. The amplifier gain can either be programmed by the user or controlled by the internal automatic gain control circuit (AGC). The gain adjustment range is 0-24db. The amplified signals are then balanced with a channel balance block. In this block, Red/Blue channel gain is increased or decreased to match Green channel luminance level and gamma correction is performed. The adjustment range is ±54db. This Function can be done manually by the user or with the internal automatic white balance controller (AWB). The balanced signal then will be digitized by the on-chip 10-bit ADC. It can operate at up to 12MHz, and is fully synchronous to the pixel clock. The actual conversion rate is determined by the frame rate. |
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