AD9992BBCZ datasheet(35/92 Pages) AD

35 / 92 page

AD9992

Rev. C | Page 35 of 92

Using the LASTREPLEN_EN

The LASTREPLEN_EN register (Address 0x00, Bits [19:16] in

the sequence registers) is used to enable a separate pattern

length to be used in the final repetition of several pulse

repetitions. It is recommended that the LASTREPLEN_EN

LASTREPLEN_B, LASTREPLEN_C, and LASTREPLEN_D

registers be set to a value equal to the VLENA, VLENB,

VLENC, and VLEND register values, respectively.

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 AD9992 can

support this by using the VREP registers. This allows a different

number of V-pattern group repetitions to be programmed on

odd and even lines. Only the number of repeats can be different

in odd and even lines, while the V-pattern group remains the same.

There are separate controls for the assigned Group A, Group B,

Group C, and Group D patterns. All groups can support odd and

even line alternation. Group A uses the VREPA_1 register and

the VREPA_2 register; Group B, Group C, and Group D use

the corresponding VREP_ODD register and VREP_EVEN

As discussed in the Generating HBLK Line Alternation section,

the HBLK signal can be alternated for odd and even lines. Figure

shows an example of V-pattern group repetition alternation

and HBLK Mode 0 alternation used together.

XV1

XV2

XV24

HBLK

XVTOGE1

XVTOGE2

XVTOGO1

XVTOGO2

XVTOGE1

XVTOGE2

NOTES

1. THE NUMBER OF REPEATS FOR V-PATTERN GROUPS A/B/C/D CAN BE ALTERNATED ON ODD AND EVEN LINES.

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

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

VREPA_1 = 2

(OR VREPB/C/D_EVEN = 2)

VREPA_2 = 5

(OR VREPB/C/D_ODD = 5)

VREPA_1 = 2

(OR VREPB/C/D_EVEN = 2)

Figure 42. Odd/Even Line Alternation of V-Pattern Group Repetitions and HBLK Toggle Positions

AD9992BBCZ 数据表(PDF) 35 Page - Analog Devices

AD9992BBCZ 数据表(HTML) 35 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92

数据表下载