AD9923ABBCZRL datasheet(30/88 Pages) AD

30 / 88 page

AD9923A

Rev. 0 | Page 30 of 88

Generating Line Alternation for V-Sequences and HBLK

During low resolution readout, some CCDs require a different

number of vertical clocks on alternate lines. The AD9923A can

support such CCDs by using different VREP registers. This

allows a different number of VPAT repetitions to be programmed

on odd and even lines.

Note that only the number of repeats is different in odd and

even lines, but the VPAT group remains the same. There are

separate controls for the assigned Group A and Group B patterns.

Both Group A and Group B can support odd and even line

alternation. Group A uses the VREPA_1 and VREPA_2 regis-

ters; Group B uses the VREPB_ODD and VREPB_EVEN

registers. Group A can also support three-line and four-line

alternation by using the VREPA_3 and VREPA_4 registers.

Additionally, the HBLK signal can be alternated for odd and

even lines. When the HBLKALT = 1, the HBLKTOGE1 and

HBLKTOGE2 positions are used on odd lines, and the

HBLKTOGE3 to HBLKTOGE6 positions are used on even

lines. This allows the HBLK interval to be adjusted on odd

and even lines if needed.

Figure 41 shows an example of simultaneous VPAT repetition

alternation and HBLK alternation. Both types of alternation can

be used separately.

XV1

XV2

VREPA_1 = 2

(OR VREPB_ODD = 2)

VREPA_2 = 5

(OR VREPB_EVEN = 5)

VREPA_1 = 2

(OR VREPB_ODD = 2)

XV13

NOTES

1. THE NUMBER OF REPEATS FOR V-PATTERN GROUP A OR GROUP B CAN BE ALTERNATED ON ODD AND EVEN LINES.

2. GROUP A ALSO SUPPORTS 3-LINE AND 4-LINE ALTERNATION USING THE ADDITIONAL VREPA_3 AND VREPA_4 REGISTERS.

3. THE HBLK TOGGLE POSITIONS CAN ALSO BE ALTERNATED BETWEEN ODD AND EVEN LINES TO GENERATE DIFFERENT HBLK PATTERNS

FOR ODD/EVEN LINES. SEE THE HORIZONTAL CLAMPING AND BLANKING SECTION FOR MORE INFORMATION ON HBLK.

HBLK

HBLKTOGE1

HBLKTOGE2

HBLKTOGE3

HBLKTOGE4

HBLKTOGE1

HBLKTOGE2

Figure 41. Odd/Even Line Alternation of VPAT Repetitions and HBLK Toggle Positions

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