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PDF ( 数据手册 , 数据表 ) PI3042A

零件编号 PI3042A
描述 Contact Image Sensor Chip
制造商 AMI SEMICONDUCTOR
LOGO AMI SEMICONDUCTOR LOGO 


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PI3042A 数据手册, 描述, 功能
www.DataSheet4U.com
REVISION NUMBER: REV A
DATE: 09/26/05
PAGES: Page 1 of 18
PI3042A
Contact Image Sensor Chip
Preliminary Data Sheet







PI3042A pdf, 数据表
Preliminary PI3042A datasheet
www.DataSheet4U.com
(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 light.
The pixel Vp(n) is one nth pixel in Npixels in the sensor.
(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 nonuniformity 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.
Measuring The Device’s High Frequency Performances
The PI3042A devices were tested on an A6 length standard CIS module’s PCB. Thirteen sensors
bonded on the PCB board along with its support circuits, such as, clock buffer circuits, the shunt
switch, SW, and its amplifier. The board’s video line capacitance, input capacitance of SW and input
capacitance of the amplifier become part of the CAP. The A6 PCB was selected because together
with the shunt switch, SW, and with its amplifier input, the video line had a typical value of ~100pf
including its stray from its PCB copper traces. Another reason for this selection is that the PI3042A
wafer probe tests of these devices are similarly setup using this method.
By removing RIN, the amplifier gain was set to one. Then with the total value of CAP at ~100pf the
Video Pixels Voltage amplitude gives a measure of the approximate Pixel charge. Note the amplifier is
a 1:1 buffer amplifier that serves to isolate the video line from the measuring instruments. Further note
that when the modules are produced, RIN is in the circuit as variable resistor. Then, in production of
the CIS modules, the video output amplitude, Vpavg, can be adjusted to the module’s specified level.
This factory adjust is required because the exposure is fixed (Exposure = Light Power X Time).
Example, the module’s light power is fixed and integrations time, Tint, is fixed. Note Tint is fixed in
accordance to users requirement, or specified for factory adjustment procedure during production. In
either case, the light exposure is fixed. Accordingly, to adjust the voltage amplitude to the specified
level, RIN is used.
Since the sensor response vary as a function of color, the PI3042A is measured with a Yellow-Green
LED light source, as well as, the Red (660 nm) LED light source. The light sources were selected
because historically, these LED light bars were used in the CIS industry and accepted in the low-cost
CIS markets. Today, the users are turning towards the Light Guides or Light Pipes as the costs have
been reducing and the image sensor’s technology continually improves. Yet, in low-cost applications
and, especially in mid-size volume production, the light bars and the older image sensors persistently
continues to be in demand by the scanning industry.
Page 8 of 18 Date: 09/23/05







PI3042A equivalent, schematic
Preliminary PI3042A datasheet
www.DataSheet4U.com
Notes (1)
(2)
(3)
The clock pulse width, tw, varies with frequency, as well as, the duty cycle.
Prohibit crossing time is to insure that no two start pulses are locked into the shift
register for any single scan time. Since the start pulse is entered into the shift
register during its active high level when the CP clock edges falls, the active high
of the start pulse is permitted only during one falling, CP, clock edges for any
given scan. Otherwise, multiple start pulses will load into the shift register.
Pixel delay times and settling time depend on the output amplifier, which is
employed. These values, tdl and ts/h, are measured with the amplifier see in
Figure 8. Typical A6 CIS Module Circuit using the PI3042A sensors. Note, the
impulse signal current out of the device has pulse width ~ 30 ns. Hence, the
faster the amplifier with a faster settling time will yield a signal video pulse with
faster rise and settle times.
Typical A6 CIS Module Circuit
See Figure 8. Typical A6 CIS Module Circuit using the PI3042A sensors. The circuit is provided as
reference to illustrate the interconnection of the PI3042A for a serially cascaded line of image sensors.
It is a typical A6 size CIS module produced by PIC. It provides the first time user with additional insight
for designing a CIS module and supplements the circuit descriptions given in the section, Signal
Conversion Circuit.
The difference is in the arrangement of the two shunt switches, U3D, and U3A. U3D is a counterpart
to SW in Figure 5. Video Output Test and Application Circuit. A DC restoration capacitor, C20,
with value of 500pf added between the shunts switch. The first, U3D, clamps the video line to
ground to reset the image sensors. Simultaneously the second, U3A, clamps the node
between C15 and amplifier input to an output reference bias voltage that is on the node
between R4 and R9. These resistors are voltage divider that sets the DC operating level of
the amplifier’s output by applying same bias voltage to both inputs of the amplifier
(See next page for the Typical A6 CIS Module Circuit.)
Page 16 of 18 Date: 09/23/05










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