Chip-to-chip non-uniformity

Ud

± 7.5

%

Dark output voltage

Vd

(5)

<50

mV

Dark output non-uniformity

Ud

(6)

<50

mV

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.

(2) f stands for the input clock frequency:

@ 500 kHz the total active line scan time for a A4 CIS module is 3.45 ms

of the line integration time.

(3) Vp is an average of the pixel amplitudes in one complete line scan. These

video pixels are converted from signal currents produced by the

phototransistor at each pixel site. The signal current charges the video line

capacitance that is isolated with amplifier buffer. The output current is

proportional to the charges that have been collected on the phototransistor’s

base through a photon-to-electron conversion process. These charges on

the base draw signal current through the emitter proportionally to the Beta of

the phototransistor. Then the emitter current flows out onto the output video

line capacitance where it is integrated and converted to signal voltage. This

is the signal voltage that the host receiver senses. Before accessing the

subsequent pixel, this video signal on the video line capacitance is reset

through a shunt switch on the video line. Then the next pixel in sequence is

readout onto the video line. This video buffer amplifier terminating the video

line provides the necessary amplification. Most user generally set their

operating output signal to ~ 1.0 V peak average with the saturation level of ~

1.5 V. For the circuit reference see the attached schematic diagram on

page 6. Typical amplification (adjustable) gain is between 4 to 5 times the

voltage that is measured on the video line.

(4) Up = [( Vpmax-Vp)/ Vp]x100%

Or [( Vp-Vpmin)/ Vp]x100%

Where Vp =

∑

N

n

N

Vpn /

Vpmax is the maximum pixel output voltage in the light.

Vpmin is the minimum pixel output voltage in the light.

In the light means module exposed a uniform light.

(5) Vd = ( Vdmax+Vdmin)/2

Vdmax is the maximum pixel output voltage in the dark.

Vdmin is the minimum pixel output voltage in the dark.

In the dark means that sensor has no exposure to the light.

(6) Ud = [( Vdmax-Vdmin)/ Vd]x100%

Absolute Maximum Ratings (not operational conditions):

Parameters

Symbol

Maximum Rating

Units

Power Supply Voltage

VDD

10

Volts

Power Supply Current

IDD

<2.0

ma

Input clock pulse (high level)

Vih

Vdd + 0.5

Volts

Page 3 of 7 - PI3034A, 06/15/03

Input clock pulse (low level)

Vil

-0.25

Volts

Table 3. Maximum Specification