AD9898 datasheet(49/52 Pages) AD

49 / 52 page

REV. 0

AD9898

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HORIZONTAL TIMING SEQUENCE EXAMPLE

Figure 54 shows a sample 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.

The horizontal direction has four OB pixels in the front and 48

in the back.

To configure the AD9898 horizontal signals for this CCD, three

sequences can be used. Figure 55 shows the first sequence to be

used during vertical blanking. During this time, there are no

EFFECTIVE IMAGE AREA

USE SEQUENCE 2

SEQUENCE 2 (OPTIONAL)

HORIZONTAL CCD REGISTER

4 OB PIXELS

48 OB PIXELS

28 DUMMY PIXELS

USE SEQUENCE 3

2 VERTICAL OB LINES

10 VERTICAL OB LINES

Figure 54. Sample CCD Configuration

SEQUENCE 1: VERTICAL BLANKING

INVALID PIX

VERTICAL SHIFT

DUMMY

INVALID PIXELS

VERT SHIFT

CDIN

SHP

SHD

CLPOB

CLPOB PULSE MAY BE USED DURING HORIZONTAL DUMMY PIXELS

IF THE H-CLOCKS ARE USED DURING VERTICAL BLANKING.

Figure 55. Horizontal Sequence during Vertical Blanking

valid OB pixels from the sensor, so the CLPOB is not used. In

some cases, if the horizontal clocks are used during this time,

the CLPOB signal may be used to keep the AD9898’s clamp

partially settled.

Figure 56 shows the recommended sequence for the vertical OB

interval. The clamp signal is used across the whole line in order

to stabilize the clamp loop of the AD9898. Figure 57 shows the

recommended sequence for the effective pixel readout. The 48 OB

pixels at the end of each line are used for the CLPOB signal.

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