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LM9830VJDX Datasheet

  • LM9830VJDX

  • LM9830 36-Bit Color Document Scanner

  • 45頁

  • NSC

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LM9830 36-Bit Color Document Scanner
November 1998
N
General Description
LM9830 36-Bit Color Document Scanner
The LM9830 is a complete document scanner system on a sin-
gle IC. The LM9830 provides all the functions (CCD control, illu-
mination control, analog front end, pixel processing function
image data buffer/SRAM controller, microstepping motor control-
ler, and EPP parallel port interface) necessary to create a high
performance color scanner. The LM9830 scans images in 36 bit
color, and has output data formats for 36 bits, 30 bits, and 24
bits.
The only additional active components required are an external
SRAM for data buffering and power transistors for the stepper
motor. Parallel port pass-through requires two additional
TTL/CMOS logic ICs.
scan resolution and pixel depth for maximum scan speed.
鈥?Stepper motor control tightly coupled with buffer management
to maximize data transfer efficiency.
鈥?PWM stepper motor current control allows microstepping for
the price of fullstepping.
鈥?Supports 64k, 128k, or 256k x8 external SRAMs.
鈥?Parallel Port interface supports EPP PS2 (bidirectional), or
,
SPP (nibble) modes of operation.
鈥?Pixel depths of 1, 2, or 4 bits are packed into bytes for faster
scans of line art and low pixel depth images.
鈥?Supports 1 and 3 channel CIS and CCD devices.
鈥?3 (R, G, and B) user-programmable gamma correction tables.
鈥?Able to transmit an arbitrary range of pixels to speed up
scanning of smaller items (business cards, etc.) by zooming
in on a subset of CCD pixels.
鈥?Compatible with a wide range of color linear CCDs and
Contact Image Sensors (CIS)
鈥?Internal bandgap voltage reference.
鈥?100 pin TQFP package
Applications
鈥?/div>
鈥?/div>
Color Flatbed Document Scanners
Color Sheetfed Document Scanners
Features
鈥?Scans at up to 6Mpixels/s (2M RGB pixels/sec).
鈥?Digital Pixel Processing provides 300, 200, 150, 100, 75, and
50 dpi horizontal resolution from 300dpi sensor, and 600, 400,
300, 200, 150, 100, 75, and 50 dpi horizontal resolution from
a 600dpi sensor.
鈥?Provides 50-600dpi vertical resolution in 1 dpi increments.
鈥?Pixel rate error correction for gain (shading) and offset errors.
鈥?Output formats include 12 bit linear, 10 bit linear with shading
and offset, or 8 bit gamma corrected, all with 12 bit accuracy.
鈥?Multiple CCD clocking rates allows matching of CCD clock to
Key Specifications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Analog to Digital Converter Resolution
12 Bits
Maximum Pixel Conversion Rate
6MHz
A4 Color 150dpi scan (typical, EPP Interface) <10 seconds
A4 Color 300dpi scan (typical, EPP Interface) <40 seconds
A4 Color 600dpi scan (typical, EPP Interface) <160 seconds
Supply Voltage
+5V鹵10%
Power Dissipation (typical)
350mW
Scanner Block Diagram
DB25
To
Computer
Buffer
+24V
To
Printer
Stepper
Motor
DB25
9
1-3
2-6
Illumination
8
2
CCD/CIS
LM9830VJD
28
SRAM
Power
Transistors
1-3
Ordering Information
Commercial (0擄C
鈮?/div>
T
A
鈮?/div>
+70擄C)
LM9830VJD
LM9830VJDX
Package
VJD100A 100 Pin Thin Quad Flatpac
VJD100A 100 Pin Thin Quad Flatpac, Tape & Reel
TRI-STATE廬 is a registered trademark of National Semiconductor Corporation.
漏1998 National Semiconductor Corporation
1
http://www.national.com

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