AMI AMIS

AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
1.0 General Description
The AMIS-710216 (PI216MC-DR) is a contact image sensor (CIS) module with an additional on board circuit that digitizes the analog
pixels from the CIS image sensor to a “background-tracking”, two-level digital output signal. It is based on CIS module, the AMIS710209-A6 (PI209M-A6) manufactured by AMIS, but with a shorter read length of 88mm. Hence, its performance is equivalent to the
AMIS-710209-A6 which uses MOS image sensor technology to gain its high-speed performance and high sensitivity. The AMIS-710216
is suitable for scanning documents with width of 88mm and with resolution of 8 dots per millimeter (dpm). It has broad applications, but
it was especially designed for the following areas:
• Where data compression is required, such as in data transmissions
• Where component pin-out count must be kept to a minimum
The background-tracking-digitizing circuits in the AMIS-710216 have been referred to as the “dynamic threshold” two-level A/D
converter. For the purpose of describing the module’s characteristics this “dynamic threshold” processing circuit shall herein be referred
to as the “tracking digitizer”.
2.0 Key Features
•
•
•
•
•
•
•
•
•
Light source, lens and sensor are integrated into a single module
8dpm resolution, 88mm scanning length
Up to 176µsec/line scanning speed, with 4MHz pixel rate (See Table 3, Note 3)
Wide dynamic range
Two-level tracking digital output (“Dynamic Threshold Digitizer”)
660nm light source (other colors available)
Compact size ≅ 13mm x 25.6mm x 102mm
Low power
Light weight
3.0 Module Description
Figure 1: Block Diagram of AMIS-710216
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AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
The AMIS-710216 module consists of 11 sensors that are cascaded to provide 704 photo-detectors with their associated multiplex
switches, and a digital shift register that controls its sequential readout. Mounted in the module is one-to-one graded-indexed micro lens
array that focuses the scanned documents to image onto its sensing plane. A buffer amplifier amplifies the video pixels from the image
sensors and passes them to analog digitizing circuit, where the video pixels are converted to digital signal and passed to output of the
module. See Figure 1, the block diagram of the AMIS-710216 module.
Illumination is accomplished by means of an integrated LED light source. All components are housed in a small plastic housing with a
cover glass which acts as the focal point for the object being scanned and protects the imaging array, the micro lens assembly and the
LED light source from dust. The pictorial of AMIS-710216 cross section is shown in Figure 2.
Figure 2: Inside Pictorial of the Module
I/O to the module is an 8-pin flex cable connector (see I/O Connector, under Specifications) located on one end of the module. The
connector is on the top of the module with the glass window facing down and it is located on the opposite side of the module. See the
Mechanical Housing under Mechanical Structure.
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AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
4.0 Circuit Description and Operation
See Figure 3 for a simplified block diagram of the analog tracking digitizer. Fundamentally, the tracking digitizer transforms the signal
output from a CIS module existing on the market today. It takes the analog signal from the CIS section of AMIS-710216 and derives a
tracking background reference signal. Then this reference is compared against the output signals from the CIS section. The resulting
signal from the comparison produces a two-level digital signal that is high when the pixel signal is brighter than the background and
remains at zero as long as the signal is darker than the background signal.
Figure 3: Analog Signal Reference Generator and a Single-bit Comparator
Figure 1 depicts the two basic circuits, the CIS (image sensors and video amplifier) and the tracking digitizer. In the CIS section, the
module has 11 serially concatenated AMIS-720234 (PI3034) image sensors, accordingly, the image sensors will span one scanningread line width that is 11 sensor times 64 pixel elements/sensor, or 704 pixel elements.
In operation, the module produces the analog image pixel signals that are proportional to exposure on the corresponding picture
element on the document (the video signal) then passes the signal to the tracking digitizer. In turn, the digitizer processes the analog
image pixels to digital image pixels. The analog image pixels, at test point TV, are separated into two signals. One generates the
reference signal and the other remains unmodified. These unmodified image pixels are applied to one of the input of the comparator.
The reference signal is applied to the second input of the comparator. The results of the comparison are the digital image pixels. This
digital output is produced in two levels, determined by the difference between the background reference signal and the analog image
pixels. A digital pixel output of value “one” represents the analog image pixel that is brighter than the background and digital pixel level
of value “zero” represents the image pixel that is darker than background.
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AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
5.0 Specifications
The I/O connector pins and their functions is listed in Table 1.
Table 1: Pin Configuration
Pin Number
1
2
3
4
5
6
7
8
Symbol
DIGOUT
Vdd (+5V)
Vn (-5V)
SP
GRD
CLOCK
GLED
VLED
Names and Functions
Digital video output
Ground; 0V
Negative power supply
Start pulse for the shift register
Ground; 0V
Clock for the shift register
Return for the LED light source
Power in for the LED light source.
The connector is an 8-pin 1mm surface mount flex input, Molex 52207-0890.
5.1 Inputs
There are five inputs:
•
•
•
•
•
Clock is on Pin 6 of the I/O connector. This is main clock input into the CIS module.
SP is on Pin 4. This is the start clock input to the CIS module.
VDD is on Pin 2. This is a +5V supply.
VN is on Pin 3. This is a -5V supply.
VLED is on Pin 8. This is a +5V supply for the LED light source.
Note: Power return for the LED light source is GLED on Pin 7 and the ground return for the CIS modules is Pin 5.
5.2 Video Output
DIGOUT is on Pin 1 of the I/O connector. This is the digital video output from the CIS module. Reflection off the dark target produces a
digital signal of “0” level, while the white reflection off the white target produces a digital level of “one”. The amplitudes of the white and
dark are listed in the table below:
6.0 Electro-Optical Characteristics (25°C)
°
Table 2: Electro-Optical Characteristics (25 C)
Parameter
Number of photo detectors
Pixel-to-pixel spacing
Line scanning rate
Clock frequency
Bright output
Dark output
Symbol
Tint
(1)
f
Digital video output signal
Parameter
704
125
352
Units
Elements
µm
µsec
2.0
>3.5
<0.8
MHz
V
V
Note
@ 2.0MHz clock
frequency
Note:
1.
The tint is specified with a 2.0MHz clock frequency. In operation, the time constants in the reference generator is set to match the initial exposure time, hence the
time constant will determine the optimum integration time. Note that the integration time is also a function of the clock frequency. Accordingly, it is highly
recommended that the parameters be factory adjusted for the specific applications. Although the specification is shown nominally at 2.0MHz, the maximum clock
frequency is 4.0MHz.
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AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
°
Table 3: Recommended Operating Conditions (25 C)
Item
Symbol
Power supply
Vdd
Vn
VLED
Idd
Ivn
ILED
Input voltage at digital high
Vih
Input voltage at digital low
Vil
Clock frequency
f
Clock pulse high duty cycle
Clock pulse high duration
Clock
Integration time
Tint
Operating temperature
Top
Notes:
1.
2.
3.
Min.
Vdd-1.0
0
Mean
5.0
-5.0
(1)
5
85
15
300
Vdd-.5
Max.
25
50
Vdd
0.8
4.0
25
(2)
62.5
(3)
0.176
Units
V
V
V
mA
mA
mA
V
V
MHz
%
ns
ms
0
C
VLED sources are also available from 5 to 24V.
Clock pulse high is specified at 4.0MHz at 25 percent duty.
The tint is specified with the maximum 4.0MHz clock frequency. In operation, the time constants in the reference generator is set to match the initial exposure
time, hence the optimum integration time will be set by optimum integration time. Accordingly, it is highly recommended that the parameters be factory adjusted for
the specific applications
7.0 Switching Characteristics (25°C)
The switching characteristics for the I/O clocks are shown in Figure 4. The timing parametric values and their symbols are given in the
Table 4.
Figure 4: Module Timing Diagram
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AMIS-710216: 200dpi Two Level Digital Output Module
Table 4: Switching Parameters and Timing Symbol Definitions
Parameter
Symbol
Clock cycle time
to
Clock pulse width
tw
Clock duty cycle
Prohibit crossing time of SP
tprh
Data setup time
tds
Data hold time
tdh
Signal delay time
tdl
Signal settling time
tsh
Digital signal delay
tddl
Digital signal off delay
tdodl
Min.
Typ.
0.50
Max.
62.5
25
15
20
20
50
50
120
60
20
Units
µs
ns
%
ns
ns
ns
ns
ns
ns
ns
8.0 Absolute Maximum Rating
Table 5: Absolute Maximum Rating
Parameter
Power supply voltage
Input clock pulse (high level)
Symbols
Vdd
Idd
Vn
In
VLED
ILED
Vih
Maximum Rating
10
100
-10
30
5.5
400
Vdd - 0.5
Units
V
mA
V
mA
V
mA
V
Input clock pulse (low level)
Vil
-0.8
V
Symbols
Top
Hop
Tstg
Hstg
Maximum Rating
0 to 50
10 to 85
-25 to +75
5 to 95
Units
°C
%
°C
%
Table 6: Operating Environment
Parameter
Operating temperature
Operating humidity
Storage temperature
Storage humidity
9.0 Setup and Adjustments
9.1 The Clock Rate and Integration Time
This was factory set to a specific application. See Note 1 under Table 2.
The clock frequency was set to 2.0MHz.
The total integration time was set to 360µsec.
9.2 The Required Power
The required power is slightly greater than the specified values in Table 3.
Circuit Power:
• Positive supply: +5V @ 90mA
• Negative supply: -5V @ 20mA
• LED power:
+5V @ 300mA
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Data Sheet
AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
9.3 Adjustments
General location of test, adjustment and monitor points.
Figure 5: AMIS-710216 Monitor and Test Points
Figure 5 shows the pictorial layout of the controls and the tests points. These adjustment potentiometers and the test points are shown
relative to the connector and to the output pads for LED light power. This is a bird’s eye view of the PCB’s backside with the glass
window of the module facing down on the documents.
The test point labeled TV is for the analog image pixels, just as it is produced at the output of the CIS array section, and prior to its entry
into the tracking digitizer circuit.
The test point labeled TR is the output of the tracking reference level from the tracking digitizer circuit.
The test point labeled TVD is the digital output from the comparator.
The offset adjust, R18, is a screw driver adjustment potentiometer that is accessed through adjustment hole as viewed in Figure 5.
Gain adjust, R16, is a screw driver adjustment potentiometer that is accessed through the hole as it is viewed in Figure 5.
9.4 There Are Only Two Adjustments
These adjustments will be pre-adjusted to the customer’s specific application at the factory; therefore, in general will not require
adjustments by the user. The test point TV is probed with a scope to monitor the analog image pixel levels. The probe should be
grounded as close to the CIS module as possible. If possible, it should be grounded right on the ground input lead, Pin 5, of the I/O
connector.
Analog zero signal adjust (OFFSET ADJ) is shown in Figure 5. This potentiometer is adjusted to place the dark level of the analog
image pixel signal to approximately 1.0V and is normally adjusted with intended targets.
Analog gain adjust, “GAIN”, is adjusted greater than 2.5 and less than 3.0V with the CIS imaged on a standard white target, similar to
the standard white copy or typing paper.
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AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
10.0 Mechanical Structure
Figure 6: Mechanical Structure
Figure 6 is pictorial of the AMIS-710216. It shows the mechanical dimensions of the housing and its mounting hole locations.
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AMIS-710216: 200dpi Two Level Digital Output Module
Data Sheet
11.0 Company or Product Inquiries
For more information about AMI Semiconductor, our technology and our product, visit our Web site at: http://www.amis.com
North America
Tel: +1.208.233.4690
Fax: +1.208.234.6795
Europe
Tel: +32 (0) 55.33.22.11
Fax: +32 (0) 55.31.81.12
Production Technical Data - The information contained in this document applies to a product in production. AMI Semiconductor and its subsidiaries (“AMIS”) have made every effort to ensure
that the information is accurate and reliable. However, the characteristics and specifications of the product are subject to change without notice and the information is provided “AS IS” without
warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify that data being relied on is the most current and complete. AMIS
reserves the right to discontinue production and change specifications and prices at any time and without notice. Products sold by AMIS are covered by the warranty and patent
indemnification provisions appearing in its Terms of Sale only. AMIS makes no other warranty, express or implied, and disclaims the warranties of noninfringement, merchantability, or fitness
for a particular purpose. AMI Semiconductor's products are intended for use in ordinary commercial applications. These products are not designed, authorized, or warranted to be suitable for
use in life-support systems or other critical applications where malfunction may cause personal injury. Inclusion of AMIS products in such applications is understood to be fully at the
customer’s risk. Applications requiring extended temperature range, operation in unusual environmental conditions, or high reliability, such as military or medical life-support, are specifically
not recommended without additional processing by AMIS for such applications. Copyright © 2006 AMI Semiconductor, Inc.
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