參數(shù)資料
型號(hào)： AD9991KCPRL
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： 10-Bit CCD Signal Processor with Precision Timing Generator
中文描述： SPECIALTY CONSUMER CIRCUIT, QCC56
封裝： 8 X 8 MM, MO-220-VLLD-2, LFCSP-56
文件頁(yè)數(shù)： 22/60頁(yè)
文件大?。?/td> 826K
代理商： AD9991KCPRL
AD9991
–22–
The example shown in Figure 22 illustrates this operation. The
first toggle position is 2, and the second toggle position is 9. In
non-Multiplier mode, this would cause the V-sequence to toggle
at pixel 2 and then pixel 9 within a single HD line. However,
toggle positions are now multiplied by the VTPLEN = 4, so the
first toggle occurs at pixel count 8, and the second toggle occurs
at pixel count 36. Sweep mode has also been enabled to allow the
toggle positions to cross the HD line boundaries.
Vertical Sensor Gate (Shift Gate) Patterns
In an Interline CCD, the vertical sensor gates (VSG) are used
to transfer the pixel charges from the light-sensitive image area
into light-shielded vertical registers. From the light-shield verti-
cal registers, the image is then read out line-by-line by using the
vertical transfer pulses V1–V6 in conjunction with the high speed
horizontal clocks.
Table IX contains the summary of the VSG pattern registers. The
AD9991 has five VSG outputs, VSG1–VSG5. Each of the out-
puts can be assigned to one of four programmed patterns by using
the SGPATSEL registers. Each pattern is generated in a similar
manner as the V-pattern groups, with a programmable start polar-
ity (SGPOL), first toggle position (SGTOG1), and second toggle
position (SGTOG2). The active line where the VSG1–VSG5
pulses occur is programmable using the SGLINE1 and SGLINE2
registers. Additionally, any of the VSG1–VSG5 pulses may be
individually disabled by using the SGMASK register. The individ-
ual masking allows all of the SG patterns to be preprogrammed,
and the appropriate pulses for the different fields can be separately
enabled. For maximum flexibility, the SGPATSEL, SGMASK,
and SGLINE registers are separately programmable for each field.
More detail is given in the Complete Field section.
V1–V6
HD
VPATLEN
MULTIPLIER MODE V-PATTERN GROUP PROPERTIES:
1. START POLARITY (ABOVE: STARTPOL = 0)
2. FIRST, SECOND, AND THIRD TOGGLE POSITIONS (ABOVE: VTOG1 = 2, VTOG2 = 9)
3. LENGTH OF VPAT COUNTER (ABOVE: VPATLEN = 4). THIS IS THE MINIMUM RESOLUTION FOR TOGGLE POSITION CHANGES.
4. TOGGLE POSITIONS OCCUR AT LOCATION EQUAL TO (VTOG VPATLEN)
5. IF SWEEP REGION IS ENABLED, THE V-PULSES MAY ALSO CROSS THE HD BOUNDRIES, AS SHOWN ABOVE
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
START POSITION OF VPAT GROUP IS STILL PROGRAMMED IN THE V-SEQUENCE REGISTERS
PIXEL
NUMBER
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
3
5
5
4
1
2
4
2
Figure 22. Example of Multiplier Region for Wide Vertical Pulse Timing
Table IX. VSG Pattern Registers (also see Field Registers in Table VII)
Register Length Range Description
SGPOL 1b High/Low Sensor Gate Starting Polarity for SG Pattern 0–3
SGTOG1 12b 0–4095 Pixel Location First Toggle Position for SG Pattern 0–3
SGTOG2 12b 0–4095 Pixel Location Second Toggle Position for SG Pattern 0–3
VD
HD
PROGRAMMABLE SETTINGS FOR EACH PATTERN:
1. START POLARITY OF PULSE
2. FIRST TOGGLE POSITION
3. SECOND TOGGLE POSITION
4. ACTIVE LINE FOR VSG PULSES WITHIN THE FIELD (PROGRAMMABLE IN THE FIELD REGISTER, NOT FOR EACH PATTERN)
VSG PATTERNS
4
1
2
3
Figure 23. Vertical Sensor Gate Pulse Placement
REV. 0
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