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參數資料
| 型號： | AD9948KCPRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | 10-Bit CCD Signal Processor with Precision Timing⑩ 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： | 15/28頁 |
| 文件大小： | 539K |
| 代理商： | AD9948KCPRL |
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REV. 0
AD9948
–15–
Table XI. 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
H-Driver and RG Outputs
In addition to the programmable timing positions, the AD9948
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 and RG driver current can be adjusted
for optimum rise/fall time into a particular load by using the
DRVCONTROL register (Address x062). The DRVCONTROL
register is divided into five different 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 maximum setting of 7 is
equal to 30.1 mA.
As shown in Figure 6, 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 AD9948 data output phase is programmable using the
DOUTPHASE register (Address x064). Any edge from 0 to 47
may be programmed, as shown in Figure 7a. The pipeline delay
for the digital data output is shown in Figure 7b.
FIXED CROSSOVER VOLTAGE
H1/H3
H2/H4
t
PD
H2/H4
H1/H3
t
RISE
t
PD
t
RISE
<<
Figure 6. H-Clock Inverse Phase Relationship
NOTES
1. DIGITAL OUTPUT DATA (DOUT) PHASE IS ADJUSTABLE WITH RESPECT TO THE PIXEL PERIOD.
2. WITHIN ONE CLOCK PERIOD, THE DATA TRANSITION CAN BE PROGRAMMED TO ANY OF THE 48 LOCATIONS.
P[0]
P[48] = P[0]
CLI
1 PIXEL PERIOD
P[12]
P[24]
P[36]
DOUT
t
OD
Figure 7a. Digital Output Phase Adjustment
NOTES
DEFAULT TIMING VALUES ARE SHOWN: SHDLOC = 0, DOUT PHASE = 0.
HIGHER VALUES OF SHD AND/OR DOUTPHASE WILL SHIFT DOUT TRANSITION TO THE RIGHT, WITH RESPECT TO CLI LOCATION.
DOUT
CCDIN
CLI
SHD
(INTERNAL)
N
N+1
N+2
N+12
N+11
N+10
N+9
N+8
N+7
N+6
N+5
N+4
N+3
N+13
N–13
N–3
N–4
N–5
N–6
N–7
N–8
N–9
N–10
N–11
N–12
N–2
N–1
N+1
N
SAMPLE PIXEL N
PIPELINE LATENCY = 11 CYCLES
t
CLIDLY
N–1
Figure 7b. Pipeline Delay for Digital Data Output
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