TH7888A Datasheet, PDF (9/16 Pages) ATMEL Corporation – Area Array CCD Image Sensor (1024 x 1024 Pixels with Antiblooming)

TH7888A
EXPOSURE TIME REDUCTION
TH7888A allows exposure time control (electronic shutter function).
The exposure time reduction is achieved by pulsing all the FPi gates to 0 volt so as to remove continuously all the photoge-
nerated electrons through antiblooming drain VA.
Fall times & rise times : see fig. 5 & 6
Figure 10 : Timing diagram for electronic shutter
TABLE 2 - DRIVE CLOCK CHARACTERISTICS
Parameter
Symbol
Image zone clocks
High level
Low level
Memory zone clocks
High level
Low level
Memory to register clocks
High level
Low level
Antiblooming gate
High level (integration)
Low level (transfer)
Reset gate
High level
Low level
Readout register clocks
FP1,2, 3,4
FM1,2,3,4
FM
FA
FR
FL1,2
Value
Min Typ Max
7.5
8
8.5
0
0.5
0.8
7.5
8
8.5
0
0.5
0.8
8.5
9
9.5
0
0.5
0.8
3
4
7
0
0.5
0.8
10
12
13
0
2
3
Unit
Remarks
Typical input capacitance
V
15 nF
V
See figure 11
Typical input capacitance
V
15.5 nF
V
See figure 11
V
Typical input capacitance
10 pF
V
Typical input capacitance
V
14 nF
V
See figures 11 & 13
V
Typical input capacitance
10 pF
V
High level
Low level
Maximum readout register frequency
FH
Image zone to memory zone transfer
frequency
FV
8.5
9
9.5
V
0
0.5
0.8
V
20
23 MHz
1.25 1.7 MHz
See figure 7
See figure 12
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