AD9920ABBCZ datasheet(37/112 Pages) AD

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AD9920A

Rev. B | Page 37 of 112

XV1

XV8

XV9

XV10

XV1 TO XV8 USE

V-PATTERN GROUP A

XV9, XV10 USE

V-PATTERN GROUP B

Figure 44. 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 45. 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 46. Combining Group A and Group B Patterns with Repetition

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

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 44

shows an example where the V9 and V10 outputs use a separate

V-pattern Group B to perform special CCD timing.

The AD9920A 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.

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

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

CONCAT_GRP = 1 feature is shown in Figure 45.

The GROUPSEL registers are used to select the group (A, B, C,

or 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 register.

AD9920ABBCZ Datasheet(PDF) 37 Page - Analog Devices

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