PI250MC-A6 Datasheet, PDF (2/7 Pages) AMI SEMICONDUCTOR – 200DPI CIS Sensor

Functional Description
The PI250MC-A6 consists of 13 imaging array sensors that are cascaded to provide 832
photo-detectors. Each sensor has their associated multiplex switches, and a digital shift
register that controls its sequential readout. Each also contains a chip select switch so
that each following chip is accessed sequentially as its predecessor chip completes its
scan. Theses chips are mounted on a PCB board along with clock buffers and video
signal amplifier. The only change from predecessor module was in this amplifier. It was
slightly altered from its predecessor module to gain the single supply feature. See Figure
1. PI250-A6 module block diagram.
GLED
VLED
LED
LED
LED
LED
LED
LED
LED
LED
12
ROD LENS
PHOTO SENSORS
830
832
831
3 4 5 ----------------
VIDEO
LINE
BUFFER
SHIFT REGISTER
VIDEO AMPLIFIER
VN(-V)
VDD (+5)
GRD
VOUT
CP
SP
GRD
Figure 1. PI250MC-A6 module block diagram
The PCB containing the imaging array is enclosed in a module housing, along with a one-
to-one graded indexed micro lens array that focuses the scanned documents' image onto
the sensing line of the sensor chips. The document is illuminated with a LED light source
which is also mounted in the housing. See Figure 2. PI250MC-A4 Cross Sectional View.
DOCUMENT SURFACE
GLASS WINDOW
LIGHT PATH
BAR
LED
PCB
SENSORS
INSIDE PICTORIAL OF MODULE
Figure 2. PI250MC-A4 Cross Sectional View
PAGE 2 OF 7 - PI250MC-A6, 12-9-00