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LM9801CCVF Datasheet

  • LM9801CCVF

  • Greyscale/24-Bit Color Linear CCD Sensor Processor

  • 34頁

  • NSC

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LM9801 8-Bit 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
Features
Y
Y
Y
Y
Y
Y
Y
Y
2 5 Million pixels s conversion rate
Pixel-rate shading correction for individual pixels maxi-
mizes dynamic range and resolution even on 鈥樷€榳eak鈥欌€?/div>
pixels
Implements Correlated Double Sampling for minimum
noise and offset error
Reference and signal sampling points digitally con-
trolled in 25 ns increments for maximum performance
Generates all necessary CCD clock signals
Compatible with a wide range of linear CCDs
Supports some Contact Image Sensors (CIS)
TTL CMOS input output compatible
Key Specifications
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Color and Greyscale Flatbed and Sheetfed Scanners
Fax and Multifunction Peripherals
Digital Copiers
General Purpose Linear CCD Imaging
Resolution
Pixel Conversion Rate
Supply Voltage
Supply Voltage (Digital I O)
Power Dissipation
8 Bits
2 5 MHz
a
5V
g
5%
a
3 3V
g
10% or
a
5V
g
5%
Y
230 mW (max)
Connection Diagrams
TL H 12814 鈥?1
TL H 12814 鈥?2
Ordering Information
Commercial (0 C
s
T
A
s
a
70 C)
LM9801CCV
LM9801CCVF
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRE
TM
is a trademark of National Semiconductor Corporation
SPI
TM
is a trademark of Motorola Inc
C
1996 National Semiconductor Corporation
TL H 12814
RRD-B30M96 Printed in U S A
Package
V52A 52-Pin Plastic Leaded Chip Carrier
VEG52A 52-Pin Thin Quad Flatpack
http
www national com

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