Instruction Manual

8
TH7834C
1997A–IMAGE–05/02
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
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.
Table 2.
Elements
Inactive
Prescan
Dark
References
Isolation
Elements
Non Useful
Pixels Useful PixelsSignals
RegisterClockFeedthrough XXXXX
AverageCCDRegisterDarkSignalXXXXX
Pixel Dark Signal X X X
Pixel Signal Under Illumination XX
Table 3. Drive Clock Voltage Swings
Parameter Symbol Logic
Value
UnitMin. Typ. Max.
Register Main Transport Clock
(1)
Φ
L1
, Φ
L2
High 8.5 9 11 V
Low 0 0.4 0.6 V
Register End Transport Clock
(1)
Φ
LS1-2
,
Φ
LS3-4
High 8.5 9 11 V
Low 0 0.2 0.4 V
Antiblooming (Low Level) And
Exposure Time Control (High Level)
(1)
Φ
A1-2
, Φ
A3-4
High 9.5 10 10.5 V
Low 0
To be
adjusted
V
Reset Clock
(1)
Φ
R1-2
, Φ
R3-4
High 10.5 11 12.5 V
Low 0 1.5 2 V
Transfer Clock
(1)
Φ
P1-2
, Φ
P3-4
High 10.5 11 11.5 V
Low 0 0.4 0.6 V