AD9927BBCZ datasheet(28/100 Pages) AD

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AD9927

Rev. 0 | Page 28 of 100

VERTICAL TIMING GENERATION

The AD9927 provides a flexible solution for generating vertical

CCD timing and can support multiple CCDs and different

system architectures. The vertical transfer clocks are used to

shift each line of pixels into the horizontal output register of the

CCD. The AD9927 allows these outputs to be individually

programmed into various readout configurations by using a

4-step process.

Figure 34 shows an overview of how the vertical timing is

generated in four steps.

1. The individual pulse patterns for XV1 to XV24 are created by

using the vertical pattern group registers.

2. The V-pattern groups are used to build the sequences, which

is where additional information is added.

3. The readout for an entire field is constructed by dividing the

field into different regions and then assigning a sequence to

each region. Each field can contain up to nine different regions

to accommodate different steps of the readout, such as high

speed line shifts and unique vertical line transfers. The total

number of V-patterns, V-sequences, and fields is programmable,

but limited by the number of registers.

4. The MODE registers allow the different fields to be combined

in any order for various readout configurations.

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