Rainbow Electronics TH7899M - Manual (Page 13)

13
TH7899M
2201A–IMAGE–02/02
Frame Transfer Timing (With Memory Zone(s) )
The video line comprises:
• 18 inactive prescans
• 7 dark references
• 5 isolation elements
• 2048 useful pixels (readout through one output) or 1024 useful pixels (readout
through 2 or 4 outputs)
Summation options:
vs = number of vertical summation (vs = 1 to sum 2 lines in the readout register),
hs = number of horizontal summation (hs = 0 to sum 2 pixels in the
φ
S gate, only add the
timing diagram once of figure 10),
vnb and hnb are defined according to the chosen operating mode in “” on page 9.
Notes: 1. Cleaning period consists of emptying the image zone of all charges created by ther-
mal generation. To achieve such cleaning, the vertical transfer of all of the image
zone to the memory zone shall be clocked according to the diagram shown in figure
12.
2. Memory zone cleaning period consists of emptying the memory zone of all charges
created by thermal generation. To achieve such cleaning, the vertical transfer from
the memory zone to the readout register shall be clocked according to the diagram
shown in figure 9. Nevertheless, it is possible to reduce cleaning time of the memory
zone by accumulating several lines in the readout register (figure 9) before reading
out the resulting line signal (see figure 11). The number of accumulated lines is lim-
ited by the output register saturation level.
Cleaning
period Vertical tranfer of one line
from the memory zone to
the readout register Horizontal transfer of
one pixel / readout Vertical transfer of one line
from the image zone to the
memory zone Memory zone
cleaning
Horizontal
summation
see note 1
see figure 9
see figure 10
see figure 11 see note 2
see figure 12
x vs
x vnb/(vs+1) minimum
x hs
x hnb/(hs+2) minimum
x nbv minimum
Exposure time
100 ns min 100 ns min no delay
100 ns min
100 ns min 100 ns min