AMIS710401-A4: 400dpi CIS Module
Data Sheet
Red 600nm LED Light Source
1.0 General Description
The AMIS-710401-A4 (PI401MC-A4) is a contact image sensor (CIS) module using MOS image sensor technology for high-speed
performance and high sensitivity. These CIS modules contain a complete optical imaging system that includes the light source and
focusing elements.
The MOS image sensors are mounted on a printed circuit board (PCB) and housed in an A4 size module. They contain video
processing circuits, allowing for high scanning speeds. The module comes with its LED light source, which provides the light power.
Since the light power limits the exposure, which is proportional to the product of scanning speed and light power, the module’s
maximum scanning speed and signal output voltage are limited, in this case with the Red light source, to a 5.5MHz clock rate.
The module is designed for scanning A4 size (216mm) documents with 16 dots per millimeter (dpm) resolution. Applications include
document scanning, mark readers, gaming and office automation equipment.
2.0 Key Features
• LED light source, lens and sensor are integrated into a single module
• 660nm LED light source
• Analog video, pixel rate as high as 5.5MHz
• 630µsec/line minimum scanning speed @ maximum of 5.5MHz clock rate
• 16 dots/mm resolution, 216mm scanning length
• Wide dynamic range
• Standard A4 size ≅ 14.5mm x 19.5mm x 232mm
• Low power
• Light weight
3.0 Functional Description
Each of the modules consists of 27 AMIS-720442 (PI3042) image sensors, serially cascaded together. Each sensor consists of 128
photo-sensing elements (pixels), resulting in a module with a length of 3456 pixels.
These image sensors, which are cascaded in a sequence to form a single line array, contain associated multiplex switches, which are
sequentially accessed with its digital shift register. Each register has a chip-select switch, which activates its shift register upon the
completion of its preceding sensor’s scan. In turn, after completing its own scan the register activates its successor’s register. The start
pulse initiates the shift register of the first chip in the line array. The first chip then sequentially clocks out the integrated charges
proportional to the image on the selected pixel site. These charges are passed through the sensors’ multiplexing switch and then out
onto the video line, where these charges are converted to a proportional voltage signal pulse. When the first sensor completes its scan,
the chip-select switch on the following chip is switched on to continue its line scan. This process continues until the module completes
its scan. A new scan is initiated when a start pulse is again entered into the first chip of each section.
The 27 sensors are cascaded together and bonded onto a PCB. They share a common clock line. Their shift registers have end-of-line
pulses that are connected to the following sensor’s register start input. Their video output shares a common video line. This video line
forms a storage capacitance, which is buffered by a video amplifier that functions as an output video driver. The charge from each
output is integrated onto the video line capacitance and readout. Then, each pixel is reset and ready to integrate the following pixel
charge.
Mounted in the module is a one-to-one graded indexed micro lens array, which focuses the images on scanned documents onto the
sensors’ sensing plane, where it the images are converted to proportional electrical charges.
AMI Semiconductor – Jun. 06, M-20589-001
1
www.amis.com
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