AMIS-720442 Datasheet, PDF (6/16 Pages) AMI SEMICONDUCTOR – 400dpi Contact Image Sensor

AMIS-720442-A: 400dpi Contact Image Sensor
Data Sheet
6.0 Two Test Setups for Specifications and Performance
6.1 First Setup
The standard specifications are the image sensor tests that are performed on the wafer probe machine where each device on the wafer
is tested in production. However, the data in these measurements are measured with a clock frequency at a fixed 500kHz. Since the
pixel rate is equal to the clock rate, the pixel rate is also at 500kHz. The specification under Section 7.0 is the wafer probe
specifications, Table 2.
6.2 Second Setup
The CIS modules made with these devices operate in excess of 5.0MHz. Accordingly the wafer probe specifications are supplemented
with high frequency clocking performance using an A6 length modules PCB board.
7.0 Electro-Optical Characteristics (25^°C)
The electro-optical characteristics of the AMIS-720442-A imaging sensor chip are listed in Table 2. This is the wafer probe specification
used to test each die at 25^°C.
Table 2: Electro-Optical Characteristics
Parameters
Symbols
Typical
Units
Notes
Number of photo-elements
128
Elements
Pixel-to-pixel spacing
Line scanning rate
Clock frequency
Output voltage
Output voltage non-uniformity
Dark output voltage
Dark output non-uniformity
Adjacent pixel non-uniformity
Chip-to-chip non-uniformity
Tint ⁽¹⁾
Fclk ⁽²⁾
Vpavg ⁽³⁾
Up ⁽⁴⁾
Vd ⁽⁵⁾
Ud ⁽⁶⁾
Upadj ⁽⁷⁾
Ucc ⁽⁸⁾
~62.5
128/Fclk
500
1.8 ± 0.35
± 7.5
<100
<100
<7.5
± 7.5
µm
µs/line
kHz
V
%
mV
mV
%
%
See Note 2 for higher clock speed (maximum 5MHz)
Notes:
(1) Tint stands for the line scanning rate or the integration time. It is determined by the time interval between two start pulses, where the start pulses start the line-
scan process, as soon as, CP, module clock, acquires it and shifts it into the internal shift register. To calculate the minimum integration time in a scan it is number
of pixels in the scan divided by the clock frequency. In a CIS module it is the number of sensors times the number of pixels in the sensor, all over the clock
frequency. This time is especially set for the wafer probes in order to calibrate the Vpavg, see Note (3).
(2) Fclk is the device’s clock, CP, frequency and it is, also, equal to the pixel rate. In the wafer test Fclk is set to 500kHz. However, AMIS has been successfully
mass-producing high frequency CIS modules, using only the wafer test to qualify them. Hence, the device, which is tested on an A6 size module’s PCB board at
the standard high speed, meets specifications.
(3) Vpavg = ∑Vp(n)/Npixels (average level in one line scan).
Where Vp(n) is the amplitude of n^th pixel in the sensor chip and Npixels is the total number of pixels in sensor chip. Vpavg is converted from impulse current
video pixel into a voltage output. See Figure 4, in Section 4.0 and Figure 5, in Section 5.0.
Vpavg is calibrated for each image sensor type because of probe card variations, as well as, the interfacing circuits to the wafer probe machine.
(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 n^th pixel in Npixels in the sensor.
(5) 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.
(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.
(8) Ucc is the uniformity specifications, measured among the good die on the wafer. Under uniform light exposure the sensors are measured and calculated with
following algorithm: Vpavg of all the good dies on the wafer are averaged and assigned VGpavg. Then the die with maximum Vpavg is assigned Vpavg(max),
and the one with minimum Vpavg is assigned Vpavg(min). Then UCC = {[Vpavg(max)-Vpavg(min)]/VGpavg}x100.
AMI Semiconductor – May 06, M-20571-001
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