PI3041A Datasheet, PDF (9/18 Pages) AMI SEMICONDUCTOR – Contact Image Sensor 300DPI CIS Sensor Chip

Preliminary PI3041A datasheet
and, especially in mid-size volume production, the LED light bars and the older image sensors
persistently continue to be in demand by the scanning industry.
The high frequency performance specifications are graphical curves showing the video output, Vpavg,
response to its applied light exposure. Although four exposure response graphs serve as good design
reference for the designer who have prior knowledge of the image power that will be exposing the
image sensors, this is not always the case, example, in designing and producing a CIS module. So to
this end, the A6 PCB board, used to characterize the light exposure to video response specification, is
enclosed in its A6 module housing and measured for its standard CIS parameters. These modules
were fabricated exactly as their production counter part, except that the gain of the amplifier is set one.
The measurements were conducted with two different LED bars, one Yellow-Green and the other Red.
Video Output Response Under Exposure
The four video signal output as function of light exposure are given in Graphs, A, B, C and D. The
measurements are conducted in Black Box that enclosed the light source, the PCB and the instrument
to measure the light power. The LED source mounted at the top radiated its light energy directly on the
image sensor of the A6 PCB that is lying flat at the bottom of box. The video output was measured at
the amplifier output of the A6 PCB. The PCB setup condition is described under the section,
Measuring The Device’s High Frequency Performance. Note the gain of the amplifier is set to one.
Also the clock duty cycle is set to 25% for the 2.0 MHz clock frequency and set to 50% for the 5.0
MHz.
VIDEO OUTPUT VS EXPOSURE
PI3041A RED LED RESPONSE 2.0 Mhz
4.000
3.500
3.000
2.500
2.000
EXP
1.500
1.000
0.500
0.000
EXPOSURE (uJ/cm^2)
Graph A. A typical Video Output a as function of Light Exposure
Illuminated with a RED 660 nm LED Source with the PI3041A clocked at 2.0 MHz
Page 9 of 18 Date: 09/23/05