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TC253SPD-30 Datasheet(PDF) 5 Page - Texas Instruments |
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TC253SPD-30 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 21 page TC253SPD30 680 × 500 PIXEL IMPACTRON CCD IMAGE SENSOR JULY 2003 − SOCS085 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions TERMINAL I/O DESCRIPTION NAME NO. I/O DESCRIPTION ADB 9 I Supply voltage for amplifiers and clearing drain CMG 6 I Charge multiplication gate IAG1 12 I Image area gate 1 IAG2 2 I Image area gate 2 NC 8 − No connection ODB 1 I Supply voltage for antiblooming drain SAG1 11 I Storage area gate 1 SAG2 3 I Storage area gate 2 SRG1 4 I Serial register gate 1 SRG2 5 I Serial register gate 2 SUB 10 − Chip substrate VOUT 7 O Output signal detailed description The TC253SPD-30 consists of four basic functional blocks: The image-sensing area, the image-storage area, the serial register, and the charge multiplier. The location of each of these blocks is identified in the functional block diagram. image-sensing and storage areas Figure 1 shows cross sections with potential-well diagrams. As light enters the silicon in the image-sensing area, electrons are generated and collected in the potential wells of the pixels. Applying a suitable dc bias to the antiblooming drain provides blooming protection. The electrons that exceed a specified level, determined by the ODB bias, are drained away from the pixels. If it is necessary to remove all previously accumulated charge from the wells, a short positive pulse must be applied to the drain. This marks the beginning of the new integration period. After the integration cycle is completed, charge is quickly transferred into the memory where it waits for readout. The lines can be read out from the memory in a sequential order to implement progressive scan, or two lines can be summed together to implement the pseudo-interlace scan. Twenty-four columns at the left edge of the image-sensing area are shielded from the incident light. These pixels provide the dark reference used in subsequent video-processing circuits to restore the video-black level. Four additional dark lines, located between the image-sensing area and the image-storage area, are added for isolation. |
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