AD9927BBCZ datasheet(34/100 Pages) AD

34 / 100 page

AD9927

Rev. 0 | Page 34 of 100

XV1

XV8

XV9

XV10

XV1 TO XV8 USE

V-PATTERN GROUP A

XV9, XV10 USE

V-PATTERN GROUP B

Figure 37. Using Separate Group A and Group B Patterns

XV1

XV24

V-PATTERN GROUP A

V-PATTERN GROUP B

V-PATTERN GROUP C

V-PATTERN GROUP D

Figure 38. 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 39. Combining Group A and Group B Patterns with Repetition

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

The AD9927 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 37 shows an example where outputs V9 and

V10 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 registers

VPATSELA, VPATSELB, VPATSELC, and VPATSELD for a

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