tcd2561d TOSHIBA Semiconductor CORPORATION, tcd2561d Datasheet - Page 5

• Manufacturer Part Number: tcd2561d
• Description: Toshiba Ccd Linear Image Sensor Ccd Charge Coupled Device
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Note 10: Random noise is defined as the standard deviation (sigma) of the output level difference between two
(1)
(2)
(3)
(4)
(5)
(6)
(7)
adjacent effective pixels under no illumination (i.e. dark conditions) calculated by the following procedure.
Two adjacent pixels (pixel n and n + 1) in one reading are fixed as measurement points.
Each of the output level at video output periods averaged over 200 ns period to get V (n) and V (n + 1).
V (n + 1) is subtracted from V (n) to get DV.
readings)
Procedure (2), (3) and (4) are repeated 10 times to get sigma value.
relative to the ground level. So we specify random noise as follows.
The standard deviation of DV is calculated after procedure (2) and (3) are repeated 30 times (30
10 sigma values are averaged.
I value calculated using the above procedure is observed
DV = V (n) - V (n + 1)
s
N
D
V
=
D
=
10
I
1
30
=
1
å
10
j
=
1
i
1
30
å
s
2
=
1
j
s
D
Vi
Output waveform (effective pixels under dark condition)
video output
pixel (n)
200 ns
5
s
=
video output
pixel (n + 1)
30
1
200 ns
i
30
å
=
1
(
|
D
2 times larger than that measured
V
i
|
Ù
D
V
)
2
DV
TCD2561D
2001-12-06