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TC255P датащи(PDF) 4 Page - Texas Instruments

номер детали TC255P
подробное описание детали  PIXEL CCD IMAGE SENSOR
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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TC255P датащи(HTML) 4 Page - Texas Instruments

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TC255P
336-
× 244-PIXEL CCD IMAGE SENSOR
SOCS057A – JUNE 1996 – REVISED MARCH 2003
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
The TC255P consists of five basic functional blocks: 1) the image-sensing area, 2) the image-clear line, 3) the
image-storage area, 4) the serial register, and 5) the charge-detection node and output amplifier.
image-sensing area
Cross sections with potential-well diagrams and top views of image-sensing and storage-area elements are
shown in Figure 1 and Figure 2. As light enters the silicon in the image-sensing area, free electrons are
generated and collected in the potential wells of the sensing elements. During this time, the antiblooming gate
is activated by the application of a burst of pulses every horizontal-blanking interval. This prevents blooming
caused by the spilling of charge from overexposed elements into neighboring elements. To generate the dark
reference that is necessary in subsequent video-processing circuits for restoration of the video-black level, there
are 12 columns of elements on the left edge of the image-sensing area shielded from light. There is also one
column of elements on the right side of the image-sensing area and one line between the image-sensing area
and the image-clear line.
ABG
IAG
10
µm
Clocked Barrier
Virtual Barrier
Antiblooming Gate
Virtual Well
Clocked Well
Light
Antiblooming
Clocking Levels
Accumulated Charge
10
µm
Figure 1. Charge-Accumulation Process
SAG
Channel Stops
Virtual Phase
Clocked Phase
Figure 2. Charge-Transfer Process
image-clear line
During start-up or electronic-shutter operations, it is necessary to clear the image area of charge without
transferring it to the storage area. In such situations, the two image-area gates are clocked 244 times without
clocking the storage-area gate. The charge in the image area is then cleared through the image-clear line.


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