參數(shù)資料
型號: AD9942BBCZ
廠商: Analog Devices Inc
文件頁數(shù): 20/36頁
文件大?。?/td> 0K
描述: IC PROCESSOR SGNL 14B 100CSPBGA
標準包裝: 1
類型: CCD 信號處理器,14 位
應(yīng)用: 數(shù)碼相機
安裝類型: 表面貼裝
封裝/外殼: 100-LFBGA,CSPBGA
供應(yīng)商設(shè)備封裝: 100-CSBGA(9x9)
包裝: 托盤
AD9942
Rev. A | Page 27 of 36
CHANNEL A AND CHANNEL B ANALOG FRONT END OPERATION
The AD9942 signal processing chain is shown in Figure 28.
Each processing step is essential for 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 μF series coupling
capacitor. This restores the dc level of the CCDIN_X signal to
approximately 1.5 V to be compatible with the 3 V supply
voltage of the AD9942.
CORRELATED DOUBLE SAMPLER
The CDS circuit samples each CCD pixel twice to extract the
video information and reject low frequency noise. The timing
shown in Figure 17 illustrates how the two internally generated
CDS clocks, SHP and SHD, are used to sample the reference
level and the CCD signal level, respectively. The placement of
the SHP and SHD sampling edges is determined by the setting
of the SAMPCONTROL register located at Address 0x63.
Placement of these two clock signals is critical for achieving the
best performance from the CCD.
05
24
0-
03
1
CCDIN_X
DIGITAL
FILTER
CLPOB
DC RESTORE
OPTICAL BLACK
CLAMP
ADC
DAC
8
CDS
INTERNAL
VREF
2V FULL SCALE
0dB ~ 18dB
SHP
SHD
VGA1
1.5V
OUTPUT
DATA
LATCH
REFT_X
REFB_X
DOUT
PHASE
PBLK
1.0V
2.0V
DOUT
AD9942
1.0F 1.0F
1.0F
VGA GAIN
REGISTERS
CLAMP LEVEL
REGISTER
14
CLPOB PBLK
V-H
TIMING
GENERATION
SHP SHD
DOUT
PHASE
PRECISION
TIMING
GENERATION
Figure 28. Channel A and Channel B Analog Front End Functional Block Diagram
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