KAI-4021 datasheet(25/56 Pages) ONSEMI

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KAI-4021 Image Sensor

www.truesenseimaging.com

Revision 1.1 PS-0014 Pg 25

TESTS

Dark Field Center Non-Uniformity

This test is performed under dark field conditions. Only the center 100 by 100 pixels of the sensor are used for this test

- pixel (974,974) to pixel (1073,1073).

Dark Field Center Non-Uniformity = Standard Deviation of center 100 by 100 pixels in mV

Units: mV rms

Dark Field Global Non-Uniformity

This test is performed under dark field conditions. The sensor is partitioned into 256 sub regions of interest, each of

which is 128 by 128 pixels in size. The average signal level of each of the 256 sub regions of interest is calculated. The

signal level of each of the sub regions of interest is calculated using the following formula:

Signal of ROI[i] = (ROI Average in ADU – Horizontal overclock average in ADU) * mV per count.

Where i = 1 to 256. During this calculation on the 256 sub regions of interest, the maximum and minimum signal levels

are found. The dark field global non-uniformity is then calculated as the maximum signal found minus the minimum

signal level found.

Units: mVpp (millivolts peak to peak)

Global Non-Uniformity

This test is performed with the imager illuminated to a level such that the output is at 70% of saturation

(approximately 868 mV). Prior to this test being performed the substrate voltage has been set such that the charge

capacity of the sensor is 1240 mV. Global non-uniformity is defined as















Signal

Area

Active

Deviation

Standard

Area

Active

100

Uniformity

Non

Global

Units: %rms

Active Area Signal = Active Area Average – Horizontal Overclock Average

Global Peak to Peak Non-Uniformity

This test is performed with the imager illuminated to a level such that the output is at 70% of saturation

(approximately 868 mV). Prior to this test being performed the substrate voltage has been set such that the charge

capacity of the sensor is 1240 mV. The sensor is partitioned into 256 sub regions of interest, each of which is 128 by

128 pixels in size. The average signal level of each of the 256 sub regions of interest (ROI) is calculated. The signal level

of each of the sub regions of interest is calculated using the following formula:

A[i] = (ROI Average – Horizontal Overclock Average)

Where i = 1 to 256. During this calculation on the 256 sub regions of interest, the maximum and minimum average

signal levels are found. The global peak to peak non-uniformity is then calculated as:

Signal

Area

Active

Signal

Minimum

A[i]

Signal

Maximum

A[i]

100

Uniformity

Non

Global



Units: %pp

Active Area Signal = Active Area Average – Horizontal Overclock Average

KAI-4021 Datasheet(PDF) 25 Page - ON Semiconductor

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