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TC236 Datasheet(PDF) 3 Page - Texas Instruments

Part No. TC236
Description  680-×500-PIXEL CCD IMAGE SENSOR
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TC236 Datasheet(HTML) 3 Page - Texas Instruments

 
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TC236
680-
× 500-PIXEL CCD IMAGE SENSOR
SOCS043A – JUNE 1994 – REVISED NOVEMBER 1994
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
ADB
4
I
Supply voltage for amplifier-drain bias
IAG1
12
I
Image-area gate 1
IAG2
3
I
Image-area gate 2
ODB
2
I
Supply voltage for overflow-drain antiblooming bias
OUT1
6
O
Output signal 1
OUT2
5
O
Output signal 2
RST
7
I
Reset gate
SAG
10, 11
I
Storage-area gate
SRG
8
I
Serial-register gate
SUB
1, 9
Substrate
detailed description
The TC236 consists of four basic functional blocks: the image-sensing area, the image-storage area, the serial
register gates, and the low-noise signal processing amplifier block with charge-detection nodes and
independent resets. 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 top views of the image-sensing and storage-area elements. As light enters the
silicon in the image-sensing area, free electrons are generated in both wells and collected in the virtual wells
of the sensing elements. The color sensitivity is obtained by manufacturing a mosaic color filter directly onto the
photosites of the image-sensing area (see Figure 3 for a mapping of the filter topology). Blooming protection
is provided by applying a dc bias to the overflow-drain bias pin. If it is necessary to clear the image before
beginning a new integration time (for implementation of electronic fixed shutter or electronic auto-iris), it is
possible to do so by applying a pulse at least 1
µs in duration to the overflow-drain bias. After integration is
complete, the charge is transferred into the storage area; the transfer timing is dependent on whether the
readout mode is interlace or progressive scan. If the progressive-scan readout mode is selected, the readout
may be performed normally with one register or high speed by using both registers (see Figure 4 through
Figure 6 for the interlace and progressive-scan readout modes).
There are 22 columns at the left edge of the image-sensing area that are shielded from incident light; these
elements provide the dark reference used in subsequent video-processing circuits to restore the video black
level. There are also four dark lines between the image-sensing and the image-storage area that prevent charge
leakage from the image-sensing area into the image-storage area.


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