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LM9812 Datasheet

  • LM9812

  • LM9812 30-Bit Color Linear CCD Sensor Processor

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LM9812 30-Bit Color Linear CCD Sensor Processor
December 1997
N
General Description
LM9812 30-Bit Color Linear CCD Sensor Processor
Features
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6 million pixels/s conversion rate (2MHz/channel x 3)
Pixel rate shading (gain) correction for individual pixels
eliminates errors from PRNU, illumination, etc.
Digitally programmed color balance controls
Pixel rate offset correction for highest quality in dark regions
Correlated Double Sampling for lowest noise
Reference and signal sampling points digitally controlled in
20ns increments
2x and 4x analog fast preview/low resolution modes
Digital control of CCD integration time
Generates all necessary CCD clock signals
Compatible with a wide range of color linear CCDs and
Contact Image Sensors (CIS)
TTL/CMOS input/output compatible
The LM9812 is a high performance integrated signal proces-
sor/digitizer for color linear CCD image scanners. The LM9812
performs all the signal processing (correlated double sampling,
pixel rate offset and shading correction, color balance control,
and 10-bit analog-to-digital conversion) necessary to maximize
the performance of a wide range of linear CCD sensors.
The LM9812 can be digitally programmed to work with a wide
variety of CCDs from different manufacturers, including both 3
output RGB and 2 output GRGB CCDs. An internal Configura-
tion Register sets CCD and sampling timing to maximize perfor-
mance, simplifying the design and manufacturing processes. For
complementary voltage reference see the LM4041-ADJ.
Applications
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Color Flatbed Document Scanners
Color Sheetfed Scanners
Multifunction Imaging Products
Digital Copiers
General Purpose Linear CCD Imaging
Key Specifications
Output Data Resolution
Pixel Conversion Rate (total)
Supply Voltage
Supply Voltage (Digital I/O)
Power Dissipation (typical)
10 Bits
6MHz
+5V鹵5%
+3.3V鹵10% or +5V鹵5%
390mW
Connection Diagrams
V
REF MID OUT
V
REF LO OUT
V
REF HI OUT
V
REF MID IN
V
REF LO IN
V
REF HI IN
V
REF IN
AGND
TR2
TR1
RS
酶2
酶1
RUN/STOP
SYNC
CS
RD
WR
MCLK
OCLK
GCLK
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TEST
OS
G
OS
R
OS
B
V
A
D9
D8
D7
D6
D5
V
DI/O
D4
DGND
I/O
D3
D2
D1
D0
RD PIXEL
LM9812CCV
DGND
Ordering Information
Commercial (0擄C
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+70擄C)
LM9812CCV
Package
V52A 52 Pin Plastic Leaded Chip Carrier
TRI-STATE廬 is a registered trademark of National Semiconductor Corporation.
漏1997 National Semiconductor Corporation
1
EOC
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http://www.national.com

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