AMIS-710324 Datasheet, PDF (5/9 Pages) AMI SEMICONDUCTOR – 300dpi CIS Module

AMIS-710324-A4: 300dpi CIS Module
Data Sheet
8.0 Dark Uniformity, Ud
Figure 3 exemplifies the definitions of the terminology, which are used to explain the video signal characteristics. Dark uniformity is
defined as Ud = Vdmax - Vdmin; where Vdmax and Vdmin are the maximum and minimum voltage of Vd, the average dark level of total
pixels in the scan line when the LED light is turned off. Vd is measured from the reset level and the amplitude between the dark level
and this reset level is called pedestal. The pedestal level is caused by the resetting operation of the pixel. Although the pedestal
remains constant for a constant clock frequency, the reset level will vary from ground because the dark level, Vd, is factory adjusted to
ground (0V).
Figure 3: Definition of the Video Pixel in the Light and in the Dark
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