Video Voltage Output from an

A4 size CIS module,

PI620MC-A4.

(Four Tapped Outputs, for high

speed application)

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.

Output voltage non-uniformity

± 7.5

%

Test circuit used only the

amplifier of note 4.

Chip-to-chip non-uniformity

Ucc

± 7.5

%

Test circuit used only the

amplifier in note 4.

Dark output voltage

Vd

(6)

<50

mV

Test circuit see note 4

Dark output non-uniformity

<20

mV

Test circuit see note 4

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 n

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