參數(shù)資料
型號(hào): AD9847
廠商: Analog Devices, Inc.
英文描述: 10-Bit 40 MSPS CCD Signal Processor with Integrated Timing Driver
中文描述: 10位40 MSPS的CCD信號(hào)處理器集成時(shí)序驅(qū)動(dòng)
文件頁(yè)數(shù): 17/28頁(yè)
文件大?。?/td> 428K
代理商: AD9847
REV. A
AD9847
–17–
H-Driver and RG Outputs
In addition to the programmable timing positions, the AD9847
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 mini-
mum setting of 0 equal to OFF or three-state and the maximum
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 1 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.
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
H2/H4
H1/H3
H1/H3
H2/H4
t
RISE
t
PD
<<
t
RISE
FIXED CROSSOVER VOLTAGE
t
PD
Figure 7. H-Clock Inverse Phase Relationship
Digital Data Outputs
The AD9847 data output phase is programmable using the
DOUTPHASE register. Any edge from 0 to 47 may be programmed,
as shown in Figure 8.
NOTES
1. DIGITAL OUTPUT DATA (DOUT) PHASE IS ADJUSTABLE WITH RESPECT TO THE PIXEL PERIOD.
2. WITHIN 1 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 8. Digital Output Phase Adjustment
相關(guān)PDF資料
PDF描述
AD9847AKST 10-Bit 40 MSPS CCD Signal Processor with Integrated Timing Driver
AD9848KST CCD Signal Processors with Integrated Timing Driver
AD9848 CCD Signal Processors with Integrated Timing Driver
AD9849 CCD Signal Processors with Integrated Timing Driver
AD9849KST CCD Signal Processors with Integrated Timing Driver
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