參數(shù)資料
型號(hào)： AD9895KBC
廠商： ANALOG DEVICES INC
元件分類(lèi)： 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(yè)數(shù)： 12/59頁(yè)
文件大?。?/td> 599K
代理商： AD9895KBC
REV. A
–12–
AD9891/AD9895
PRECISION TIMING
HIGH SPEED TIMING GENERATION
The AD9891/AD9895 generates flexible, high speed timing
signals using the
Precision Timing
core. This core is the founda-
tion for generating the timing used for both the CCD and the
AFE: the reset gate RG, horizontal drivers H1
–
H4, and the
SHP/SHD sample clocks. A unique architecture makes it rou-
tine for the system designer to optimize image quality by
providing precise control over the horizontal CCD readout and
the AFE correlated double sampling.
The high speed timing of the AD9891/AD9895 operates the
same in either Master or Slave Mode configuration.
Timing Resolution
The
Precision Timing
core uses a 1 master clock input (CLI) as
a reference. This clock should be the same as the CCD pixel
clock frequency. Figure 7 illustrates how the internal timing
core divides the master clock period into 48 steps or edge posi-
tions. Using a 20 MHz CLI frequency, the edge resolution of
the
Precision Timing
core is 1 ns. If a 1 system clock is not
available, it is also possible to use a 2 reference clock by pro-
gramming the CLIDIVIDE Register (Addr x01F). The AD9891/
AD9895 will then internally divide the CLI frequency by two.
The AD9891/AD9895 also includes a master clock output,
CLO, which is the inverse of CLI. This output is intended to be
used as a crystal driver. A crystal can be placed between the
CLI and CLO Pins to generate the master clock for the
AD9891/AD9895. For more information on using a crystal, see
Figure 51.
High Speed Clock Programmability
Figure 8 shows how the high speed clocks RG, H1
–
H4, SHP,
and SHD are generated. The RG pulse has programmable
rising
and falling edges, and may be inverted using the polarity
control.
The horizontal clocks H1 and H3 have programmable
rising and falling edges and polarity control. The H2 and H4
clocks are always inverses of H1 and H3, respectively.
Table I summarizes the high speed timing registers and their
parameters. Figure 9 shows the typical 2-phase H-clock
arrangement in which H3 and H4 are programmed for the same
edge location as H1 and H2.
The edge location registers are six bits wide, but there are only
48 valid edge locations available. Therefore, the register values
are mapped into four quadrants, with each quadrant containing
12 edge locations. Table II shows the correct register values for
NOTES
PIXEL CLOCK PERIOD IS DIVIDED INTO 48 POSITIONS, PROVIDING FINE EDGE RESOLUTION FOR HIGH SPEED CLOCKS.
THERE IS A FIXED DELAY FROM THE CLI INPUT TO THE INTERNAL PIXEL PERIOD POSITIONS (
t
CLIDLY
= 6ns TYP).
P[0]
P[48] = P[0]
P[12]
P[24]
P[36]
1 PIXEL
PERIOD
CLI
t
CLIDLY
POSITION
Figure 7. High Speed Clock Resolution from CLI Master Clock Input
H1
H2
CCD
SIGNAL
RG
PROGRAMMABLE CLOCK POSITIONS:
1: RG RISING EDGE
2: RG FALLING EDGE
3: SHP SAMPLE LOCATION
4: SHD SAMPLE LOCATION
5: H1 RISING EDGE POSITION AND 6: H1 FALLING EDGE POSITION (H2 IS INVERSE OF H1)
7: H3 RISING EDGE POSITION AND 8: H3 FALLING EDGE POSITION (H4 IS INVERSE OF H3)
H3
H4
3
4
1
2
5
6
7
8
Figure 8. High Speed Clock Programmable Locations
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