AMIS-710627-A4, AMIS-710628-A4, AMIS-710629-A4:
600dpi CIS Modules
Data Sheet
10.0 Depth of Focus
spread among the modules. Note that the MTF is greater than 40 percent out to a distance greater than 0.3mm from the glass surface.
Since this module is a 600dpi module, a pixel density of 600 pixels per inch, the MTF was measured with a 300dpi or a 150 line-pair per
inch optical bar pattern. The test was conducted with pixel rate set to 5.0MHz.
The effective algorithm used in the measurements is as described by the following equation:
MTF={[Vp(n)+Vp(n+1)]/2-[Vp(n+2)+Vp(n+3)]/2}/{[Vp(n)+Vp(n+1)]/2+[Vp(n+2)+Vp(n+3)]/2}
th
th
Where n is 1, 2, .....5184 , Vp(n) is the signal amplitude of the n pixel.
Figure 4: Typical
TYPICAL MTF VS
MTF versus Distance
FOCUS
DEPTH OF
M
TF
IN
%
60
50
40
30
20
10
0
0
0.2
0.4
0.6
DEPTH FROM THE WINDOW SURFACE(mm)
AMI Semiconductor
– Jan. 06, M-20493-001
www.amis.com
8
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