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參數資料
| 型號： | AD9949KCPRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | 12-Bit CCD Signal Processor with Precision Timing Core |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC40 |
| 封裝： | 6 X 6 MM, MO-220-VJJD-2, LFCSP-40 |
| 文件頁數： | 19/36頁 |
| 文件大小： | 707K |
| 代理商： | AD9949KCPRL |
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AD9949
Table 16. H1CONTROL, RGCONTROL, DRVCONTROL, and SAMPCONTROL Register Parameters
Parameter
Length
Range
Polarity
1b
High/Low
Positive Edge
6b
0 to 47 Edge Location
Negative Edge
6b
0 to 47 Edge Location
Sample Location
6b
0 to 47 Sample Location
Drive Control
3b
0 to 7 Current Steps
DOUT Phase
6b
0 to 47 Edge Location
Rev. B | Page 19 of 36
Description
Polarity Control for H1/H3 and RG (0 = No Inversion, 1 = Inversion).
Positive Edge Location for H1/H3 and RG.
Negative Edge Location for H1/H3 and RG.
Sampling Location for SHP and SHD.
Drive Current for H1 to H4 and RG Outputs, 0 to 7 Steps of 4.1 mA Each.
Phase Location of Data Outputs with Respect to Pixel Period.
Table 17.
Precision Timing
Edge Locations
Quadrant
Edge Location (Decimal)
I
0 to 11
II
12 to 23
III
24 to 35
IV
36 to 47
Register Value (Decimal)
0 to 11
16 to 27
32 to 43
48 to 59
Register Value (Binary)
000000 to 001011
010000 to 011011
100000 to 101011
110000 to 111011
H-DRIVER AND RG OUTPUTS
In addition to the programmable timing positions, the AD9949 features on-chip output drivers for the RG and H1 to H4 outputs. These
drivers are powerful enough to directly drive the CCD inputs. The H-driver and RG driver current can be adjusted for optimum rise/fall
time into a particular load by using the DRVCONTROL register (Address 0×62). The DRVCONTROL register is divided into five differ-
ent 3-bit values, each one being adjustable in 4.1 mA increments. The minimum setting of 0 is equal to OFF or three-state, and the maxi-
mum setting of 7 is equal to 30.1 mA.
As shown in Figure 18, 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 ap-
proximately 50% of the output swing. The crossover voltage is not programmable.
DIGITAL DATA OUTPUTS
The AD9949 data output phase is programmable using the DOUTPHASE register (Address 0×64). Any edge from 0 to 47 may be pro-
grammed, as shown in Figure 19. The pipeline delay for the digital data output is shown in Figure 20.
FIXED CROSSOVER VOLTAGE
H1/H3
H2/H4
t
PD
H2/H4
H1/H3
t
RISE
t
PD
<<
t
RISE
0
Figure 18. H-Clock Inverse Phase Relationship
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