AD9992BBCZ datasheet(32/92 Pages) AD

32 / 92 page

AD9992

Rev. C | Page 32 of 92

XV1

XV8

XV9

XV10

XV1 TO XV8 USE

V-PATTERN GROUP A

XV9, XV10 USE

V-PATTERN GROUP B

Figure 36. Using Separate Group A and Group B V-Patterns

XV1

XV24

V-PATTERN GROUP A

V-PATTERN GROUP B

V-PATTERN GROUP C

V-PATTERN GROUP D

Figure 37. Combining Multiple V-Patterns Using CONCAT_GRP = 1

XV1

XV10

V-PATTERN GROUP A V-PATTERN GROUP B

GROUP A REP 1

GROUP A REP 2

GROUP A REP 3

Figure 38. Combining Group A and Group B V-Patterns with Repetition

Group A/Group B/Group C/Group D Selection

The AD9992 has the flexibility to use four different V-pattern

groups in a vertical sequence. In general, the vertical outputs

use the same V-pattern group during a particular sequence. It is

possible to assign some of the outputs to a different V-pattern

group, which can be useful in certain CCD readout modes.

The GROUPSEL registers are used to select Group A, Group B,

Group C, or Group D for each V-output. In general, only a single

V-pattern group is needed for the vertical outputs; therefore,

Group A should be selected for all outputs by default

(GROUPSEL_0, GROUPSEL_1 = 0x00). In this configuration,

all outputs use the V-pattern group specified by the VPATSELA

If additional flexibility is needed, some outputs can be set to

Group B, Group C, or Group D in the GROUPSEL registers.

In this case, those selected outputs use the V-pattern group

specified by the VPATSELB, VPATSELC, or VPATSELD

registers. Figure 36 shows an example where outputs XV9 and

XV10 are using a separate V-Pattern Group B to perform

special CCD timing.

Another application of the Group A, Group B, Group C, and

Group D registers is to combine up to four different V-pattern

groups together for more complex patterns. This is accom-

plished by setting the CONCAT_GRP register (Address 0x00,

Bits [13:10]) equal to 0x01. This setting combines the toggle

positions from the V-pattern groups specified by the VPATSELA,

VPATSELB, VPATSELC, and VPATSELD registers for a maximum

of up to 16 toggle positions. Example timing for the CONCAT_

GRP = 1 feature is shown in Figure 37.

If only two groups are needed (up to eight toggle positions) for

the specified timing, the VPATSELB, VPATSELC, and

VPATSELD registers can be programmed to the same value.

If only three groups are needed, VPATSELC and VPATSELD

can be programmed to the same value. Following this approach

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