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TC285SPD-B0 Datasheet(PDF) 6 Page - Texas Instruments |
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TC285SPD-B0 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 30 page TC285SPD-B0 1004 x 1002 PIXEL IMPACTRONTM CCD IMAGE SENSOR SOCS093 – JANUARY 2006 TEXAS INSTRUMENTS POST OFFICE BOX 655303 * DALLAS TEXAS 75265 6 Terminal functions Terminal name No. I/O Description VDD 17 I Supply voltage for amplifiers VCLD 19 I Supply voltage for Clearing drain & ESD circuits IAG1 6,23 I Image area gate-1 IAG2 5,24 I Image area gate-2 ODB 4 I Supply voltage for anti-blooming drain OUT 18 O Output signal, multiplier channel SAG1 8,21 I Storage area gate-1 SAG2 7,22 I Storage area gate-2 SRG1 10 I Serial register gate-1 SRG2 11 I Serial register gate-2 CMG 12 I Charge multiplication gate RST 13 I Reset gate FP 20 I Field plate (See Figure 3) VREFG 16 I Amplifier reference gate SUB 3,9,14,15 - Chip substrate P+ 1,2 - Peltier cooler power supply -positive P- 27,28 - Peltier cooler power supply -negative Detailed description The TC285SPD consists of five basic functional blocks: The image-sensing area, the image–storage area, the serial register, the charge multiplier, and the charge detection node with buffer amplifier. The location of each of these blocks is identified in the functional block diagram. Image-sensing and storage areas Figure 1 and Figure 2 show the pixel cross-section with potential-well diagram and top views of pixels in the image-sensing and storage areas. As light enters the silicon in the image-sensing area, electrons are generated and collected in potential wells of the pixels. Applying a suitable dc bias to the anti blooming drain provides blooming protection. The electrons that exceed a specific 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 is 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. 28 columns at the left edge and 4 columns at the right 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. Additionally, 6 dark lines, located between the image sensing area and the image-storage area, were added to the array for isolation. |
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