TH7834C Datasheet, PDF (8/13 Pages) ATMEL Corporation – Very Highresolution Linear CCD Image Sensor (12000 Pixels)

Cross over of complementary clocks (Φ_L1 and Φ_L2) preferably at 50% of their amplitude.
Note: Generally, the difference between the floating diode level and signal level is the sum of
several signals:
• Register clock feedthrough
• Average CCD register dark signal proportional to CCD clock period, mode, temperature
• Pixel dark signal (depending upon temperature and exposure time)
• Pixel signal under illumination
Table 2.
Elements
Signals
Register Clock Feedthrough
Average CCD Register Dark Signal
Pixel Dark Signal
Pixel Signal Under Illumination
Inactive
Prescan
X
X
Dark
References
X
X
X
Isolation
Elements
X
X
Non Useful
Pixels
X
X
X
X
Useful Pixels
X
X
X
X
Table 3. Drive Clock Voltage Swings
Value
Parameter
Symbol
Logic
Min.
Typ.
Max.
Unit
High
8.5
9
11
V
Register Main Transport Clock⁽¹⁾
Φ_L1, Φ_L2
Low
0
0.4
0.6
V
Register End Transport Clock⁽¹⁾
Φ_LS1-2,
Φ_LS3-4
High
Low
8.5
0
9
0.2
11
0.4
V
V
High
9.5
10
10.5
V
Antiblooming (Low Level) And
Exposure Time Control (High Level)⁽¹⁾
Φ_A1-2, Φ_A3-4
Low
0
To be
adjusted
V
Reset Clock⁽¹⁾
High
10.5
11
12.5
V
Φ_R1-2, Φ_R3-4
Low
0
1.5
2
V
Transfer Clock⁽¹⁾
High
10.5
11
11.5
V
Φ_P1-2, Φ_P3-4
Low
0
0.4
0.6
V
Note:
1. Transients under 0.0V in the clock pulses will lead to charge injection, causing a localized increase of the dark signal. If such
spurious negative transients are present, they can be removed by inserting a serial resistor of appropriate value (typically
20 Ω to 100 Ω) at the relevant driver output.
8 TH7834C
1997A–IMAGE–05/02