tcd1709d TOSHIBA Semiconductor CORPORATION, tcd1709d Datasheet - Page 6

• Manufacturer Part Number: tcd1709d
• 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) Two adjacent pixels (pixel n and n + 1) in one reading are fixed as measurement points.
2) Each of the output levels at video output periods averaged over 200 nanosecond period to get Vn and
3) Vn + 1 is subtracted from Vn to get ¨V.
4) The standard deviation of ¨V is calculated after procedure 2) and 3) are repeated 30 times (30 readings).
5) Procedure 2), 3) and 4) are repeated 10 times to get 10 sigma values.
6)
adjacent effective pixels under no illumination (i.e. dark condition) calculated by the following procedure.
Vn + 1.
the ground level. So we specify the random noise as follows.
I
value calculated using the above procedure is observed
Random noise =
¨V= Vn í Vn + 1
D
s
V
=
=
10
1
30
1
10
j
å
=
1
s
30
i
å
=
j
Output waveform
(effective pixels
under dark condition)
1
D
Vi
1
2
I
s
=
30
1
30
i
å
=
1
D
Video output
200 ns
Vi
pixel n
-
6
D
V
2
Video output
200 ns
pixel (n + 1)
2
times larger than that measured relative to
s
TCD1709D
2002-11-14