Epson PhotoPC 850Z, Service Manual, Page: 45 / 127

EPSON PhotoPC 850Z Revision A
Operating Principles Operating Principles of Circuit Boards 45
2.2.2 CA2 Circuit Description
2.2.2.1 Circuit Description
DIGITAL CLAMP
The optical black section of the CCD extracts the average values from the
subsequent data to make the black level of the CCD output data uniform for
each line.
The optical black section of the CCD averaged value for each line is taken as
the sum of the value for the previous line multiplied by the coefficient k and the
value for the current line multiplied by the coefficient 1-k.
Figure 2-8. CA2 Circuit Block Diagram
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