AD9992_07 AD [Analog Devices], AD9992_07 Datasheet - Page 32

• Manufacturer Part Number: AD9992_07
• Description: 12-Bit CCD Signal Processor with Precision Timing Generator
• Manufacturer: AD [Analog Devices]

AD9992
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
register.
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
XV10
XV1
HD
XV24
XV10
XV1
XV1
XV8
XV9
HD
HD
V-PATTERN GROUP A
V-PATTERN GROUP A
XV1 TO XV8 USE
V-PATTERN GROUP A
V-PATTERN GROUP B
GROUP A REP 1
XV9, XV10 USE
Figure 38. Combining Group A and Group B V-Patterns with Repetition
V-PATTERN GROUP B
Figure 37. Combining Multiple V-Patterns Using CONCAT_GRP = 1
Figure 36. Using Separate Group A and Group B V-Patterns
V-PATTERN GROUP B
Rev. C | Page 32 of 92
GROUP A REP 2
V-PATTERN GROUP C
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
V-PATTERN GROUP D
GROUP A REP 3