AMIS-720341-A: Contact Image Sensor
Data Sheet
Table 4: Electro-Optical Characteristics at High Frequency
Red 660 LED Bar, A6 PCB in A6 Module Housing, at 5.0MHz Clock
Parameters
Line scanning rate
Clock frequency
Output voltage
Output voltage non-uniformity
Dark output voltage
Dark output non-uniformity
Adjacent pixel non-uniformity
LED bar input voltage
LED bar input current
Symbols
Typical
251
5
Units
µs/line
MHz
V
Remarks
(1)
Tint
13 die in the scan, see Note 1 (bottom of Table 6)
Fclk (2)
Vpavg (3)
Up (4)
0.5
Amplifier gain = 1.0, see Note 3
LED bar non-uniformity, see Note 4
%
± 20
<190
<80
<20
5.0
(5)
Vd
Ud
mV
mV
%
V
mA
(6)
Upadj (7)
VLED (8)
ILED (8)
LED power varies greatly, see Note 8
LED power varies greatly, see Note 8
90
Table 5: Electro-Optical Characteristics at High Frequency
Y-G LED Bar, A6 PCB in A6 Module Housing, at 2.0MHz Clock
Parameters
Line scanning rate
Clock frequency
Output voltage
Output voltage non-uniformity
Dark output voltage
Dark output non-uniformity
Adjacent pixel non-uniformity
LED bar input voltage
LED bar input current
Symbols
Typical
627
2
0.150
± 20
<30
<15
<20
5.0
Units
µs/line
MHz
V
Remarks
(1)
Tint
13 die in the scan, see Note 1 (bottom of Table 6)
Fclk (2)
Vpavg (3)
Up (4)
Amplifier gain = 1.0, see Note 3
LED bar non-uniformity, see Note 4
%
(5)
Vd
Ud
mV
mV
%
V
mA
(6)
Upadj (7)
VLED (8)
ILED (8)
LED power varies greatly, see Note 8
LED power varies greatly, see Note 8
380
Table 6: Electro-Optical Characteristics at High Frequency
Y-G LED Bar, A6 PCB in A6 Module Housing, at 5.0MHz Clock
Parameters
Line scanning rate
Clock frequency
Output voltage
Output voltage non-uniformity
Dark output voltage
Dark output non-uniformity
Adjacent pixel non-uniformity
LED bar input voltage
LED bar input current
Notes:
Symbols
Typical
251
Units
µs/line
MHz
V
Remarks
(1)
Tint
13 die in the scan, see Note 1 (bottom of Table 6)
Fclk (2)
Vpavg (3)
Up (4)
5
0.080
± 25
<180
<60
<20
5.0
Amplifier gain = 1.0, see Note 3
LED bar non-uniformity, see Note 4
%
(5)
Vd
Ud
mV
mV
%
V
mA
(6)
Upadj (7)
VLED (8)
ILED (8)
LED power varies greatly, see Note 8.
LED Power varies greatly, see Note 8.
380
(1) Note 1 under Table 2, is a valid definition, except that the A6 modules have 13 sensors sequentially cascaded, hence, Tint = (13X96)/Fclk is the minimum
integration time.
(2) Fclk is the module’s clock, CP, frequency and equal to the pixel rate. Also, the clock duty cycle is set to 25 percent for the 2.0MHz clock frequency and set to 50
percent for the 5.0MHz.
(3) Vpavg = ∑Vp(n)/Npixels (average level in one line scan).
Where Vp(n) is the amplitude of nth pixel in one line scan of the modules.
Npixels is the total number of pixels in the module, i.e., 13 die x 96 pixels.
The amplitude of Vpavg is adjusted with RIN (which are installed in the production module) on all of CIS modules because of variations caused by the
LED light sources. The low-cost production LED’s light power are known to vary as much as ± 30 percent.
(4) Up is the uniformity specification, measured under a uniform exposing light exposure. Up = [Vp(max) - Vpavg] / Vpavg x 100% or [Vpavg - Vp(min)] / Vpavg} x
100%, whichever is greater.
Where Vp(max) is the maximum pixel output voltage in the light.
Vp(min) is the minimum pixel output voltage in the dark.
The pixel Vp(n) is one nth pixel in Npixels in the sensor.
In applying the Up definition, Npixels must change. It must include 13 sensors, or 13x96 pixels.
Additionally, because the low-cost LED power variation can be high as ± 30 percent, the non-uniformities may vary as much as ± 30 percent. Hence the
uniformities are worse because of the LED bar CIS modules.
(5) Vd = ∑Vp(n)/Npixels. Where Vp(n) is the pixels signal amplitude of the nth pixel of the sensor. Dark is where light is off, leaving the image surface unexposed.
(6) Ud = Vdmax – Vdmin.
(7) Upadj = MAX[ | (Vp(n) - Vp(n+l) | / Vp(n)) x 100%. Upadj is the non-uniformity in percentage. It is the amplitude difference between two neighboring pixels.
AMI Semiconductor – May 06, M-20570-001
11
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