Video Voltage Output from an
A4 size CIS module,
PI620MC-A4.
(Four Tapped Outputs, for high
speed application)
Output voltage non-uniformity
Vpavg (4)
1.0
0.300
Volts
Volts
Using a Red LED Source.
Using a Yellow-Green LED
Source. At minimum
integration time @ 277 µsec
@ 5MHz clock rate.
Test circuit used only the
amplifier of note 4.
Test circuit used only the
amplifier in note 4.
Up (5)
Ucc
%
%
± 7.5
± 7.5
Chip-to-chip non-uniformity
Vd (6
<50
<20
mV
mV
Test circuit see note 4
Test circuit see note 4
)
Dark output voltage
Dark output non-uniformity
Ud (6)
Table 2. Electro-Optical Characteristic
Notes:
1) Tint stands for the line scanning rate or the integration time. It is
determined by the time interval between two start pulses. @the maximum
clock rate of 6.5 MHz, Tint = 29.5 µsec,
2) fclk stands for the input clock frequency: Maximum operating frequency is
6.5 MHz.
3) There are three types of signal outputs that are called out in the table.
See under the section entitled, Output Circuits for Converting the
Video Signal. The referenced section discusses each video output
circuits. Two are defined for pulsed current, or charge processing, see
Figure 4A, Virtual Ground Amplifier or see Figure 4C, Signal Current
to Voltage Converter. The third is voltage output circuit, specified for
most CIS (contact imaging sensors) application because its lower cost
and simpler implementation advantages. See Figure 4B, Voltage
Buffer Amplifier.
4) Specified for CIS application is a circuit with a buffer amplifier that
interfaces the video output. See Figure 4B, Voltage Buffer Amplifier.
This typical video output line is terminated with a commonly used
standard op-amp circuit. It is located under the section entitled,
Output Circuits for Converting the Video Signal. The PI227MC-A4 CIS
module, employing this type of output circuit, was used in the
measurements. Note a LED light source is an integral part of the
module.
5) Up is the uniformity specification. It is measure with the image sensor
exposed under a uniform light source.
Up = [(Vpmax-Vpavg)/Vpavg]x100%
Or [(Vpavg-Vpmin)/Vpavg]x100%, which ever is greater.
Where Vpavg = å Vpn/Npixels
Vpn is the nth pixels of sensor chip.
Npixels is the total number of pixels in sensor chip.
Vpmax is the maximum pixel output voltage in the light.
Vpmin is the minimum pixel output voltage in the light.
Note: In the light means the sensor is exposed to the light.
PAGE 3 OF 10, PI3039, 12/2/02
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