AMIS-710227 Datasheet, PDF (10/14 Pages) AMI SEMICONDUCTOR – 200dpi CIS Module

AMIS-710227, AMIS-710228, AMIS-710229: 200dpi CIS Module Data Sheet
10.0 MTF Graph and its Discussion
TYPICAL MTF VS DEPTH OF FOCUS
60
50
40
30
20
10
0
0
0.2
0.4
0.6
DEPTH FROM THE WINDOW SURFACE(mm)
Figure 4: Typical MTF vs. Distance
This graph essentially shows the working depth-of-focus. Two curves indicate the spread among the modules. Note that MTF is greater
than 40 percent out to a distance greater than 0.4mm from the glass surface. Since this module is a 200dpi module, a pixel density of
200 pixels per inch, the MTF was measured with a 100dpi or a 50 line-pair per inch optical bar pattern. The test was conducted with
the pixel rate set to 2.5MHz.
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}
Where n is 1, 2, .....1728^th, Vp(n) is the signal amplitude of the n^th pixel.
Where n is 1, 2, .....1728^th, Vp(n) is the signal amplitude of the n^th pixel.
AMI Semiconductor – May 06, M-20548-001
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