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參數(shù)資料
| 型號： | UPD8884A |
| 廠商： | NEC Corp. |
| 英文描述： | (10680 PIXELS x 4 LINES) x 3 COLOR CCD LINEAR IMAGE SENSOR |
| 中文描述： | （1.068萬像素× 4行）× 3彩色CCD線性圖像傳感器 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 285K |
| 代理商： | UPD8884A |
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Data Sheet S17546EJ1V0DS
20
μ
PD8884A
13. 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 the following formula.
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
The following figure shows output waveform (valid photocell under dark condition).
Reset feed-through
Video output
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