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參數資料
| 型號： | AD9937 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CCD Signal Processor with Precision Timing⑩ Generator |
| 中文描述： | CCD信號處理器精確定時⑩發生器 |
| 文件頁數： | 21/44頁 |
| 文件大小： | 410K |
| 代理商： | AD9937 |
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REV. 0
AD9937
–21–
ANALOG FRONT END DESCRIPTION AND OPERATION
The AD9937 AFE signal processing chain is shown in Figure 11.
Each processing step is essential in achieving a high quality image
from the raw CCD pixel data.
DC Restore
To reduce the large dc offset of the CCD output signal, a dc
restore circuit is used with an external 0.1
μ
F series coupling
capacitor. This restores the dc level of the CCD signal to approxi-
mately 1.5 V to be compatible with the 3 V analog supply of
the AD9937.
Correlated Double Sampler
The CDS circuit samples each CCD pixel twice to extract the
video information and reject low frequency noise. The timing
diagram in Figure 13 illustrates how the two internally gener-
ated CDS clocks, SHP and SHD, are used to sample the
reference level and the data level, respectively, of the CCD
signal. The placement of the SHP and SHD sampling edges is
determined by the setting of the SHPLOC (addr 0x05) and
SHDLOC (addr 0x05) control registers. Placement of these two
clock edges is critical in achieving the best performance from
the CCD.
6dB TO 40dB
DIGITAL
FILTER
CLPOB
DC RESTORE
OPTICAL BLACK
CLAMP
ADC
VGA
8-BIT
DAC
CLAMP LEVEL
REGISTER
VGA GAIN
REGISTER
10
CDS
INTERNAL
VREF
2V FULL
SCALE
10
PRECISION
TIMING
GENERATION
SHPSHD
1.5V
OUTPUT
DATA
LATCH
REFT
2.0V
REFB
DOUT
PHASE
V-H
TIMING
GENERATION
SHP
SHD
DOUT
PHASE
CLPOB
1.0V
DOUT
8
1.0 F
1.0 F
CCDIN
AD9937
0.1 F
Figure 11. AFE Block Diagram
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD9937BCPZ-24 | 制造商:Analog Devices 功能描述: |
| AD9937BCPZ-27 | 功能描述:IC CCD SIGNAL PROC/GEN 制造商:analog devices inc. 系列:* 零件狀態:上次購買時間 標準包裝:1 |
| AD9937BCPZRL-24 | 制造商:Analog Devices 功能描述: |
| AD9937BCPZRL-27 | 功能描述:IC CCD SIGNAL PROC/GEN 制造商:analog devices inc. 系列:* 零件狀態:上次購買時間 標準包裝:1 |
| AD9937KCP | 制造商:Analog Devices 功能描述:AFE Video 1ADC 10-Bit 3V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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