參數(shù)資料
型號： AD9848KST
廠商： ANALOG DEVICES INC
元件分類： 消費家電
英文描述： CCD Signal Processors with Integrated Timing Driver
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： PLASTIC, LQFP-48
文件頁數(shù)： 20/36頁
文件大?。?/td> 347K
代理商： AD9848KST
REV. 0
AD9848/AD9849
–20–
H-Driver and RG Outputs
In addition to the programmable timing positions, the AD9848/
AD9849 features on-chip output drivers for the RG and H1–H4
outputs. These drivers are powerful enough to directly drive the
CCD inputs. The H-driver current can be adjusted for optimum
rise/fall time into a particular load by using the DRV registers. The
RG drive current is adjustable using the RGDRV register. Each
3-bit DRV register is adjustable in 3.5 mA increments, with the
minimum setting of 0 equal to OFF or three-state, and the maxi-
mum setting of 7 equal to 24.5 mA.
As shown in Figure 7, the H2/H4 outputs are inverses of H1/
H3. The internal propagation delay resulting from the signal
inversion is less than l ns, which is significantly less than the
typical rise time driving the CCD load. This results in a H1/H2
crossover voltage at approximately 50% of the output swing.
The crossover voltage is not programmable.
Digital Data Outputs
The AD9848/AD9849 data output phase is programmable
using the DOUTPHASE register. Any edge from 0 to 47 may
be programmed, as shown in Figure 8.
P[0]
PIXEL
PERIOD
RG
H1/H3
RGf[12]
P[48] = P[0]
Hf[24]
SHP[28]
CCD SIGNAL
P[24]
P[12]
P[36]
Hr[0]
RGr[0]
SHD[48]
NOTES
1. ALL SIGNAL EDGES ARE FULLY PROGRAMMABLE TO ANY OF THE 48 POSITIONS WITHIN ONE PIXEL PERIOD.
2. DEFAULT POSITIONS FOR EACH SIGNAL ARE SHOWN ABOVE.
POSITION
t
S1
Figure 6. High-Speed Clock Default and Programmable Locations
Table II. H1–H4, RG, SHP, SHD Timing Parameters
Register Name
Length
Range
Description
POL
POSLOC
1b
6b
High/Low
0–47 Edge Location
Polarity Control for H1, H3, and RG (0 = No Inversion, 1 = Inversion)
Positive Edge Location for H1, H3, and RG
Sample Location for SHP, SHD
Negative Edge Location for H1, H3, and RG
Drive Current for H1–H4 and RG Outputs (3.5 mA Per Step)
NEGLOC
DRV
6b
3b
0–47 Edge Location
0–7 Current Steps
Table III.
Precision Timing
Edge Locations
Quadrant
Edge Location (Decimal)
Register Value (Decimal)
Register Value (Binary)
I
II
III
IV
0 to 11
12 to 23
24 to 35
36 to 47
0 to 11
16 to 27
32 to 43
48 to 59
000000 to 001011
010000 to 011011
100000 to 101011
110000 to 111011
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