Ccd Drive; Ccd Output Gain Correction And Offset Correction; A/D Conversion Of Ccd Putput - Canon iR C3200 Series Service Manual

7.2.2 CCD Drive

The CCD sensor used in the machine is a 3-line (RGB, 1 line each) linear image sensor consisting of photocells of
7350 pixels. The signals photo-converted by the light-receiving block are sent out as analog signals of 2 channels
(even-numbered pixels EVEN and odd-numbered pixels ODD).
Light-receiving block
(photodiode)
CCD Block Diagram

7.2.3 CCD Output Gain Correction and Offset Correction

The analog video signals from the CCD are modified so that the rate of its amplitude is of a specific level (gain
correction); it is also modified so that its output voltage in the absence of incident light is a specific level (offset
correction).

7.2.4 A/D Conversion of CCD Putput

The odd-numbered and even-numbered analog video signals after correction are further converted into 10-bit digital
signals corresponding to the levels of the pixel voltages by the A/D converter.
Shift register
Gate
6 5 4
Gate
shift register
Output buffer
Odd-numbered data
3 2 1
Even-numbered data
Output buffer
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