PI3042A Datasheet, PDF (13/18 Pages) AMI SEMICONDUCTOR – Contact Image Sensor Chip

Preliminary PI3042A datasheet
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
Fclk ⁽²⁾
Vpavg ⁽³⁾
Up ⁽⁴⁾
Vd ⁽⁵⁾
Ud ⁽⁶⁾
Upadj ⁽⁷⁾
VLED ⁽⁸⁾
ILED ⁽⁸⁾
5
0.2
25
<160
<60
<20
5.0
380
MHz
V
%
mV
mV
%
V
mA
Amplifier Gain = 1.0, see
note 3
LED bar non-uniformity,
see note 4.
LED Power Varies greatly.
See note 8.
LED Power Varies greatly.
See note 8.
Table 6. Electro-Optical Characteristic At High Frequency
Notes: (1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Note 1 under Table 2, Electro-Optical Characteristic is valid definition, except
that in the A6 modules has 13 sensors sequentially cascaded, hence, Tint =
(13X128)/Fclk for the minimum integration time.
Fclk is the module’s clock, CP, frequency and equal to the pixel rate. 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.
Vpavg = Vp(n)/Npixels (average level in one line scan).
Where Vp(n) is the amplitude of n^th pixel in one line scan of the modules.
Npixels is the total number of pixels in the module, i.e., 13 die x 128 pixels. The
amplitude of Vpavg is adjusted with RIN (which 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%.
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 light.
The pixel Vp(n) is one n^th pixel in Npixels in the sensor.
In applying the Up definition, Npixels must change. It must include 13 sensors,
or 13x128 pixels.
Additionally, because the low-cost LED power variation can be high as ± 30%,
the non-uniformities may varies as much as ± 30%. Hence the uniformities are
worst because of the LED Bar CIS modules.
Vd = Vp(n)/Npixels. Where Vp(n) is the pixels signal amplitude of the n^th pixel
of the sensor. Dark is where light is off, leaving the image surface unexposed.
Ud = Vdmax – Vdmin.
Upadj = MAX[ | (Vp(n) - Vp(n+l) | / Vp(n)) x 100%. Upadj is the nonuniformity in
percentage. It is the amplitude difference between two neighboring pixels.
The low-cost LED light powers are widely specified, worst case as high as ± 30%,
hense, the requirement for the Vpavg Gain Control and the wide Up specifications.
Page 13 of 18 Date: 09/23/05