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參數(shù)資料
| 型號： | UPD8891 |
| 廠商： | NEC Corp. |
| 英文描述： | (5340 x 5340) PIXELS x 3 + 2670 PIXELS x 3 COLOR CCD LINEAR IMAGE SENSOR |
| 中文描述： | （5340 x 5340）像素× 3 2670像素× 3彩色CCD線性圖像傳感器 |
| 文件頁數(shù)： | 25/32頁 |
| 文件大?。?/td> | 297K |
| 代理商： | UPD8891 |
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Data Sheet S16039EJ2V0DS
25
μ
PD8891
9. Register Imbalance :
RI
(1200 dpi)
The rate of the difference between the averages of the output voltage of Odd and Even bits, against the
average output voltage of all the valid pixels.
RI (%) =
2
n
j = 1
j = 1
n
2
(V
2j
–
1
–
V
2j
)
1
n
n
V
j
×
100
∑
∑
n
V
j
: Number of valid pixels
: Output voltage of each pixel
10. Random noise (CDS) :
σ
CDS
Random noise
σ
CDS is defined as the standard deviation of a valid pixel output signal with 100 times (=100
lines) data sampling at dark (light shielding).
σ
CDS is calculated by the following procedure.
1. One valid photocell in one reading is fixed as measurement point.
2. The output level is measured during the reset feed-through period which is averaged over 100 ns to get
“VD
i
”.
3. The output level is measured during the Video Output time averaged over 100 ns to get “VO
i
”.
4. The correlated double sampling output is defined by VCDS
i
= VD
i
– VO
i
5. Repeat the above procedure (1 to 4) for 100 times (= 100 lines).
6. Calculate the standard deviation
σ
CDS using the following formula equation.
CDS (mV) =
, V =
i
1
100
(VCDS
i
–
V)
2
i
1
100
VCDS
i
100
100
1
σ
Reset feed-through
Video output
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