KAI−04070
DEVICE DESCRIPTION
Architecture
RDcd
R2cd
R1c
RDcd
R2cd
R1d
HLOD
VDDc
VDDd
VOUTc
1 11 24 16
1024
1024
186 24 11
1
VOUTd
1 Dummy
16
16
GND
OGc
H2SLc
GND
OGd
H2SLd
V1T
V2T
V3T
V4T
V1T
V2T
V3T
V4T
DevID
2048H x2048V
7.4mm x 7.4mm Pixels
ESD
24 16
16 24
ESD
V1B
V2B
V3B
V4B
V1B
V2B
V3B
V4B
RDab
R2ab
RDab
R2ab
16 Buffer
16 Dark
R1a
R1b
à
1 Dummy (Last VCCD Phase = V1
H1S)
VDDa
VDDb
VOUTa
1 11 24 186
1024
1024
186 24 11
1
VOUTb
HLOD
GND
OGa
GND
OGb
H2SLa
H2SLb
Figure 2. Block Diagram
Image Acquisition
Dark Reference Pixels
There are 16 dark reference rows at the top and 16 dark
rows at the bottom of the image sensor. The 24 dark columns
on the left or right side of the image sensor should be used
as a dark reference.
Under normal circumstances use only the center
22 columns of the 24 column dark reference due to potential
light leakage.
An electronic representation of an image is formed when
incident photons falling on the sensor plane create
electron-hole pairs within the individual silicon
photodiodes. These photoelectrons are collected locally by
the formation of potential wells at each photosite. Below
photodiode saturation, the number of photoelectrons
collected at each pixel is linearly dependent upon light level
and exposure time and non-linearly dependent on
wavelength. When the photodiodes charge capacity is
reached, excess electrons are discharged into the substrate to
prevent blooming.
Dummy Pixels
Within each horizontal shift register there are 12 leading
additional shift phases. These pixels are designated as
dummy pixels and should not be used to determine a dark
reference level.
ESD Protection
In addition, there is one dummy row of pixels at the top
and bottom of the image.
Adherence to the power-up and power-down sequence is
critical. Failure to follow the proper power-up and
power-down sequences may cause damage to the sensor. See
Power-Up and Power-Down Sequence section.
Active Buffer Pixels
16 unshielded pixels adjacent to any leading or trailing
dark reference regions are classified as active buffer pixels.
These pixels are light sensitive but are not tested for defects
and non-uniformities.
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