AD9925BBCZRL datasheet(30/96 Pages) AD

30 / 96 page

AD9925

Rev. A | Page 30 of 96

ion for Vertical Sequence and

nation used together. It is also possible to use

attern Group during VSG Active Line

itions for the second

VPAT group.

Generating Line Alternat

HBLK

During low resolution readout, some CCDs require a different

number of vertical clocks on alternate lines. The AD9925 can

support this by using the VPATREPO and VPATREPE registers

This allows a different number of VPAT repetitions to be pro-

grammed on odd and even lines. Note that only the number of

repeats can be different in odd and even lines, but the VPAT

group remains the same.

Additionally, the HBLK signal can also be alternated for odd

and even lines. When the HBLKALT register is set high, the

HBLK TOG1 and HBLK TOG2 positions will be used on odd

lines, and the HBLK TOG3 to HBLK TOG6 positions will be

used on even lines. This allows the HBLK interval to be adjusted

on odd and even lines if needed.

Figure 38 shows an example of a VPAT repetition alternation

and a HBLK alter

the VPAT and HBLK alternation separately.

Second Vertical P

Most CCDs require additional vertical timing during the senso

gate (SG) line. The AD9925 supports the option to output a

second vertical pattern group for XV1 to XV8 during the line

when the sensor gates XSG1 to XSG6 are active. Figure 39 shows

a typical SG line that includes two separate sets of vertical pattern

group for XV1 to XV6. The vertical pattern group at the start of

the SG line is selected in the same manner as the other regions,

using the appropriate VSEQSEL register. The second vertical

pattern group, unique to the SG line, is selected using the

VPATSECOND register, located with the field registers. The

start position of the second VPAT group uses the VPATLEN

it is not possible to program multiple repet

XV1

XV2

VPATREPO = 2

XV6

VPATREPE = 5

NOTES

1. THE NUMBER OF REPEATS FOR THE VERTICAL PATTERN GROUP MAY B

2. THE HBLK TOGGLE POSITIONS MAY BE ALTERNATED BETWEEN ODD AN

GENERATE DIFFERENT HBLK PATTERNS FOR ODD/EVEN LINES.

VPATREPO = 2

E ALTERN

D EVEN LI

ATED ON ODD AND EVEN LINES.

NES, IN ORDER TO

HBLK

TOG1

TOG2

TOG3

TOG4

TOG1

TOG2

Figure 38. Odd/Even Line Alteration of VPAT Repetitions and HBLK Toggle Positions

XV1

XV2

XV6

XSG

SECOND VPAT GROUP

OR SECOND VPAT GROUP

GISTER

START POSITION F

USES VPATLEN RE

Figure 39. Example of Second VPAT Group during Sensor Gate Line

AD9925BBCZRL 数据表(PDF) 30 Page - Analog Devices

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