AD9991 datasheet(15/60 Pages) AD

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AD9991

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HORIZONTAL TIMING SEQUENCE EXAMPLE

Figure 13 shows an example CCD layout. The horizontal register

contains 28 dummy pixels, which will occur on each line clocked

from the CCD. In the vertical direction, there are 10 optical

black (OB) lines at the front of the readout and two at the back

of the readout. The horizontal direction has four OB pixels in the

front and 48 in the back.

Figure 14 shows the basic sequence layout, to be used during the

effective pixel readout. The 48 OB pixels at the end of each line

are used for the CLPOB signals. PBLK is optional and is often

used to blank the digital outputs during the noneffective CCD

pixels. HBLK is used during the vertical shift interval.

The HBLK, CLPOB, and PBLK parameters are programmed in

the V-sequence registers.

More elaborate clamping schemes may be used, such as adding

in a separate sequence to clamp during the entire shield OB lines.

This requires conﬁguring a separate V-sequence for reading out

the OB lines.

HORIZONTAL CCD REGISTER

EFFECTIVE IMAGE AREA

28 DUMMY PIXELS

48 OB PIXELS

4 OB PIXELS

10 VERTICAL OB LINES

2 VERTICAL OB LINES

Figure 13. 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 14. Horizontal Sequence Example

REV. 0

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