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參數(shù)資料
| 型號： | AD9991KCPZRL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 17/60頁 |
| 文件大小： | 0K |
| 描述： | IC CCD SIGNAL PROCESSOR 56-LFCSP |
| 產(chǎn)品變化通告： | Product Discontinuance 27/Oct/2011 |
| 標準包裝： | 2,500 |
| 類型： | CCD 信號處理器，10 位 |
| 輸入類型： | 邏輯 |
| 輸出類型： | 邏輯 |
| 接口： | 3 線串口 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 56-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 56-LFCSP-VQ（8x8） |
| 包裝： | 帶卷 (TR) |
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AD9991
–24–
VERTICAL TIMING EXAMPLE
To better understand how the AD9991 vertical timing generation
is used, consider the example CCD timing chart in Figure 25.
This particular example illustrates a CCD using a general 3-eld
readout technique. As described in the previous Field section,
each readout eld should be divided into separate regions to
perform each step of the readout. The sequence change posi-
tions (SCP) determine the line boundaries for each region, and
the VSEQSEL registers will then assign a particular V-sequence
to each region. The V-sequences will contain the specic timing
information required in each region: V1–V6 pulses (using VPAT
groups), HBLK/CLPOB timing, and VSG patterns for the SG
active lines.
This particular timing example requires four regions for each
of the three elds, labeled Region 0, Region 1, Region 2, and
Region 3. Because the AD9991 allows up to six individual elds
to be programmed, the Field 0, Field 1, and Field 2 registers can
be used to meet the requirements of this timing example. The
four regions for each eld are very similar in this example, but
the individual registers for each eld allow exibility to accom-
modate other timing charts.
Region 0 is a high speed vertical shift region. Sweep mode can be
used to generate this timing operation, with the desired number
of high speed vertical pulses needed to clear any charge from the
CCD’s vertical registers.
Region 1 consists of only two lines, and uses standard single line
vertical shift timing. The timing of this region area will be the
same as the timing in Region 3.
Region 2 is the sensor gate line, where the VSG pulses transfer the
image into the vertical CCD registers. This region may require the
use of the second V-pattern group for SG active line.
Region 3 also uses the standard single line vertical shift timing,
the same timing as Region 1.
In summary, four regions are required in each of the three elds.
The timing for Regions 1 and 3 is essentially the same, reducing
the complexity of the register programming.
Other registers will need to be used during the actual readout
operation, such as the MODE register, shutter control registers
(TRIGGER, SUBCK, VSUB, MSHUT, STROBE), and the AFE
gain register. These registers will be explained in other examples.
Important Note About Signal Polarities
When programming the AD9991 to generate the V1–V6,
VSG1–VSG5, and SUBCK signals, it is important to note that
the V-driver circuit usually inverts these signals. Carefully check
the required timing signals needed at the input and output of
the V-driver circuit being used, and adjust the polarities of the
AD9991 outputs accordingly.
REV. 0
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