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參數(shù)資料
| 型號(hào)： | XRD9853 |
| 廠(chǎng)商： | Exar Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 75K |
| 代理商： | XRD9853 |
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
(510) 668-7000
FAX (510) 668-7017
XRDAN103
XRD9853 Pixel Sampling Timing and
Correlated Double Sample/Hold (CDS)
December 1998-2
Application Note:
XRD9853 Pixel Sampling Timing
The timing required by the XRD9853 to sample individual pixel data from a CCD output is
shown below in Figure 1. The diagram shows the general relationship of timing signals
RSTCCD, SHP and SHD to the CCD output waveform. The XRD9853 was designed to sample
any analog CCD output waveform. In order to do this the timing signals need to be referenced
to the waveform itself, not to the CCD’s timing generator.
SHP
SHD
CCD
signal
RSTCCD
pixel black level
sample point
pixel video level
sample point
T
BK
T
VD
T
RST
switch
turn off
switch
turn on
Reset
Pulse
Reset
Phase
Black
Referance
Phase
Video
Phase
1
2
2
3
4
3
4
5
5
1
Figure 1. CDS Timing Diagram (CLK_POL = High) - Proper Placement of
Timing is Critical to Image Quality
Table 1. Event Table for CDS Timing (CLK_POL = High)
Event
x
y
Action
Disconnects CDS Inputs from Reset Noise
Connects CDS Inputs and Tracks Black
Level
Hold Black Level and Track Video Level
Hold Video Level
No Action
↑
RSTCCD
↓
RSTCCD
z
{
|
↓
SHP
↓
SHD
↑
SHP/SHD
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