LM9801 Datasheet, PDF (1/34 Pages) National Semiconductor (TI) – Greyscale/24-Bit Color Linear CCD Sensor Processor

June 1996
LM9801 8-Bit Greyscale 24-Bit Color Linear
CCD Sensor Processor
General Description
The LM9801 is a high performance integrated signal proc-
essor digitizer for linear CCD image scanners The LM9801
performs all the analog processing (correlated double sam-
pling for black level and offset compensation pixel-by-pixel
gain (shading) correction and 8-bit analog-to-digital conver-
sion) necessary to maximize the performance of a wide
range of linear CCD sensors
The LM9801 can be digitally programmed to work with a
wide variety of CCDs from different manufacturers An inter-
nal configuration register sets CCD and sampling timing to
maximize performance simplifying the design and manufac-
turing processes
The LM9801 can be used with parallel output color CCDs A
signal inversion mode eases use with CIS sensors For com-
plementary voltage reference see the LM4041
Applications
Y _{Color and Greyscale Flatbed and Sheetfed Scanners}
Y _{Fax and Multifunction Peripherals}
Y _{Digital Copiers}
Y _{General Purpose Linear CCD Imaging}
Features
Y _{2 5 Million pixels s conversion rate}
Y _{Pixel-rate shading correction for individual pixels maxi-}
mizes dynamic range and resolution even on ‘‘weak’’
pixels
Y _{Implements Correlated Double Sampling for minimum}
noise and offset error
Y _{Reference and signal sampling points digitally con-}
trolled in 25 ns increments for maximum performance
Y _{Generates all necessary CCD clock signals}
Y _{Compatible with a wide range of linear CCDs}
Y _{Supports some Contact Image Sensors (CIS)}
Y _{TTL CMOS input output compatible}
Key Specifications
Y _Resolution
8 Bits
Y _{Pixel Conversion Rate}
2 5 MHz
Y _{Supply Voltage}
a5V g 5%
Y _{Supply Voltage (Digital I O)}
a3 3V g 10% or a5V g 5%
Y _{Power Dissipation}
230 mW (max)
Connection Diagrams
TL H 12814 – 1
Ordering Information
Commercial (0 C ^s T_A ^s a70 C)
LM9801CCV
LM9801CCVF
Package
V52A 52-Pin Plastic Leaded Chip Carrier
VEG52A 52-Pin Thin Quad Flatpack
TL H 12814 – 2
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C1996 National Semiconductor Corporation TL H 12814
RRD-B30M96 Printed in U S A
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