AD9923A データシートの表示（PDF） - Analog Devices

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AD9923A

CCD Signal Processor with V-Driver and Precision Timing Generator

Analog Devices 

AD9923A

Group A/Group B Selection

The AD9923A has the flexibility to use two V-pattern groups in

a vertical sequence. In general, all vertical outputs use the same

V-pattern group during a sequence, but some outputs can be

assigned to a different V-pattern group. This is useful during

certain CCD readout modes.

The GROUPSEL register is used to select Group A or Group B

for each XV output (the LSB is XV1, the MSB is XV13). Setting

each bit to 0 selects Group A; setting each bit to 1 selects Group B.

If only a single V-pattern group is needed for the vertical

outputs, Group A is used by default (GROUPSEL = 0), and the

outputs use the V-pattern group specified by the VPATSELA

register.

If Group B flexibility is needed, the outputs set to 1 in the

GROUPSEL register use the V-pattern group selected by the

VPATSELB register. For example, Figure 38 shows outputs

XV12 and XV13 using a separate V-Pattern Group B to perform

special CCD timing.

Another application of the Group A and Group B registers is to

combine two VPAT groups for more complex patterns. This is

achieved by setting the TWO_GROUP register to 1. Figure 39

shows an example of this timing. When TWO_GROUP = 1,

the Group A and Group B toggle positions are both used. In

addition, length, starting polarity, and number of repetitions

are all determined by the appropriate registers for Group A

when TWO_GROUP = 1. Figure 40 shows the more complex

operation of combining Group A and Group B with repetition.

HD

XV1 TO XV11 USE

V-PATTERN GROUP A

XV1

OPTIONAL HOLD AREA

FOR GROUP A

XV11

XV12

XV13

XV12, XV13 USE

V-PATTERN GROUP B

Figure 38. Using Separate Group A and Group B Patterns

HD

XV1

XV13

HD

XV1

XV13

V-PATTERN GROUP A V-PATTERN GROUP B

Figure 39. Combining Group A and Group B Patterns

V-PATTERN

GROUP A

V-PATTERN

GROUP B

GROUP A REP 1

GROUP A REP 2

GROUP A REP 3

Figure 40. Combining Group A and Group B Patterns, with Repetition

Rev. A | Page 28 of 84

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