參數(shù)資料
型號(hào)： AD9895KBC
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： CCD Signal Processors with Precision Timing⑩ Generator
中文描述： SPECIALTY CONSUMER CIRCUIT, PBGA64
封裝： PLASTIC, CSPBGA-64
文件頁數(shù)： 17/59頁
文件大小： 599K
代理商： AD9895KBC
REV. A
AD9891/AD9895
–17–
VERTICAL TIMING GENERATION
The AD9891/AD9895 provide a very flexible solution for gener-
ating vertical CCD timing and can support multiple CCDs and
different system architectures. The 4-phase vertical transfer
clocks V1
–
V4 are used to shift each line of pixels into the hori-
zontal output register of the CCD. The AD9891/AD9895 allow
these outputs to be individually programmed into different pulse
patterns. Vertical sequence control registers then organize the
individual vertical pulses into the desired CCD vertical timing
arrangement.
Figure 17 shows an overview of how the vertical timing is gener-
ated in three basic steps. First, the individual pulse patterns or
sequences are created by using the Vertical Transfer Pulse (VTP)
Registers. These sequences are a essentially a
“
pool
”
of pulse
patterns that may be assigned to any of the V1-V4 outputs. Sec-
ond, individual regions are built by assigning a sequence to each
of the V1
–
V4 outputs. Up to five unique regions may be speci-
fied. Finally, the readout of the entire field is constructed by
combining one or more of the individual regions sequentially.
With up to eight region areas available, different steps of the
readout such as high speed line shifts and vertical image transfer
can be supported.
USE REGION 2 FOR LINES 1 TO 20
USE REGION 1 FOR LINE 21
USE REGION 0 FOR LINES 22 TO 2000
USE REGION 2 FOR LINES 2001 TO 2020
*
SEQUENCES MAY BE SHIFTED AND/OR INVERTED
SEQUENCE 2
SEQUENCE 3
SEQUENCE 0
SEQUENCE 1
SEQUENCE 9
SEQUENCE 10
SEQUENCE 5
SEQUENCE 7
SEQUENCE 6
SEQUENCE 8
SEQUENCE 4
SEQUENCE 11
CREATE THE INDIVIDUAL VERTICAL
SEQUENCES (MAXIMUM OF 12 SEQUENCES).
BUILD THE INDIVIDUAL VERTICAL REGIONS BY ASSIGNING
EACH SEQUENCE TO V1–V4 OUTPUTS (MAXIMUM OF 5 REGIONS).
REGION 0
V1 (SEQ 0)
V2 (SEQ 0
*
)
V3 (SEQ 1)
V4 (SEQ 1
*
)
REGION 1
V1 (SEQ 2)
V2 (SEQ 3)
V3 (SEQ 4)
V4 (SEQ 5)
REGION 4
V1 (SEQ 6)
V2 (SEQ 6
*
)
V3 (SEQ 7)
V4 (SEQ 7
*
)
BUILD THE ENTIRE FIELD READOUT BY COMBINING
MULTIPLE REGIONS (MAXIMUM OF 8 COMBINATIONS).
Figure 17. Summary of Vertical Timing Generation
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