參數(shù)資料
型號: AD9979BCPZRL
廠商: Analog Devices Inc
文件頁數(shù): 26/56頁
文件大?。?/td> 0K
描述: IC PROCESSOR CCD 14BIT 48-LFCSP
標準包裝: 1
類型: CCD 信號處理器,14 位
輸入類型: 邏輯
輸出類型: 邏輯
接口: 3 線串口
電流 - 電源: 48mA
安裝類型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 48-LFCSP-VQ(7x7)
包裝: 標準包裝
其它名稱: AD9979BCPZRLDKR
AD9979
Rev. C | Page 32 of 56
Input Configurations
The CDS circuit samples each CCD pixel twice to extract the
video information and to reject the low frequency noise (see
Figure 43). There are three possible configurations for the CDS:
inverting CDS mode, noninverting CDS mode, and SHA mode.
CDSMODE (Address 0x00[9:8]) selects which configuration is
SHA1
SHA2
SHD
SHP
DIFF
AMP
CDS OUTPUT
CCDINP
CCDINM
0
59
57
-04
5
Figure 43. CDS Block Diagram (Conceptual)
Inverting CDS Mode
For this configuration, the signal from the CCD is applied
to the positive input of the CDS system (CCDINP) and the
negative side (CCDINM) is grounded (see Figure 44). The
CDSMODE setting for this configuration is 0x00. Traditional
CCD applications use this configuration with the reset level
established below the AVDD supply level, by the AD9979 dc
restore circuit, at approximately 1.5 V. The maximum saturation
level is 1.0 V below the reset level, as shown in Figure 45 and
Table 18. A maximum saturation voltage of 1.4 V is also
possible when using the minimum CDS gain setting.
IMAGE
SENSOR
SHA/
CDS
CCDINM
CCDINP
AD9979
NOTES
1. COUPLING CAPACITOR IS NOT REQUIRED FOR CERTAIN
BLACK-LEVEL REFERENCE VOLTAGES.
05
95
7-
0
46
Figure 44. Single-Input CDS Configuration
(N) SIGNAL SAMPLE
(N) RESET SAMPLE
(N + 1) RESET SAMPLE
VDD
RESET LEVEL
(VRST)
SIGNAL LEVEL
(VFS)
05957-
047
Figure 45. Traditional Inverting CDS Signal
Table 18. Inverting Voltage Levels
Signal Level
Symbol
Min
Typ
Max
Unit
Saturation
VFS
1000
1400
mV
Reset
VRST
VDD 500
VDD 300
VDD
mV
Supply Voltage
VDD
1600
1800
2000
mV
Noninverting CDS Mode
If the noninverting input is desired, the reset level signal (or black
level signal) is established at a voltage above ground potential.
Saturation level (or white level) is approximately 1 V. Samples are
taken at each signal level (see Figure 46 and Table 19).
(N) SIGNAL SAMPLE
(N) RESET SAMPLE
(N + 1) RESET SAMPLE
GND
RESET LEVEL
(VRST)
SIGNAL LEVEL
(VFS)
05957-
048
Figure 46. Noninverting CDS Signal
Table 19. Noninverting Voltage Levels
Signal Level
Symbol
Min
Typ
Max
Unit
Saturation
VFS
1000
1400
mV
Reset
VRST
0
250
500
mV
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