AD9925BBCZ datasheet(22/96 Pages) AD

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AD9925

Rev. A | Page 22 of 96

HORIZONTAL CCD REGISTER

EFFECTIVE IMAGE AREA

28 DUMMY PIXELS

48 OB PIXELS

4 OB PIXELS

10 VERTICAL

OB LINES

2 VERTICAL

OB LINES

Figure 28. Example CCD Configuration

VERTICAL SHIFT

VERT SHIFT

CCDIN

SHP

SHD

H1/H3

H2/H4

HBLK

PBLK

CLPOB

OPTICAL BLACK

DUMMY

EFFECTIVE PIXELS

OPTICAL BLACK

Figure 29. Horizontal Sequence Example

VERTICAL TIMING GENERATION

The AD9925 provides a very flexible solution for generating

vertical CCD timing and can support multiple CCDs and dif-

ferent system architectures. The vertical transfer clocks XV1 to

XV8 are used to shift each line of pixels into the

ut register of the CCD. The AD9925 allows these outputs to be

individually programmed into various readout configurations,

sing a 4-step process.

Figure 30 shows an overview of how the vertical timing is gen-

erated in four steps. First, the individual pulse patterns for XV1

to XV8 are created by using the vertical pattern group registers.

Second, the vertical pattern groups are used to build the

sequences, where additional information is added. Third, the

readout for an entire field is constructed by dividing the field

into different regions and then assigning a sequence to ea

can contain up to seven different regions to

accommodate the different steps of the readout, such as high

speed line shifts and unique vertical line transfers. Up to six

different fields may be created. Finally, the MODE register al-

lows the different fields to be combined into any order for vari-

ous readout configurations.

horizontal out-

region. Each field

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