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LM9831CCVJDX Datasheet

  • LM9831CCVJDX

  • LM9831 42-Bit Color, 1200dpi USB Image Scanner

  • 41頁

  • NSC

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LM9831 42-Bit Color 1200dpi USB Image Scanner
October 1999
N
Image Scanner
LM9831 42-Bit Color, 1200dpi USB
General Description
The LM9831 is a complete USB image scanner system on a sin-
gle IC. The LM9831 provides all the functions (image sensor
control, illumination control, analog front end, pixel processing
function image data buffer/DRAM controller, microstepping
motor controller, and USB interface) necessary to create a high
performance color scanner. The LM9831 scans images in 42 bit
color/14 bit gray, and has output data formats for 24 bit color/8
bit gray. The LM9831 supports sensors with pixel counts of up to
16384 pixels x 3 colors (1200 dpi x 13.6 inches).
The LM9831鈥檚 low operating and suspend mode supply currents
allow design of USB bus-powered scanners. The only additional
active components required are an external 4Mbit or 16Mbit
DRAM for data buffering and power transistors for the stepper
motor.
鈥?Stepper motor control tightly coupled with image data buffer
management to maximize data transfer efficiency.
鈥?PWM stepper motor current control allows microstepping for
the price of fullstepping.
鈥?USB interface for Plug and Play operation on USB-equipped
computers.
鈥?Serial EEPROM option for custom Vendor and Product IDs.
鈥?Support for USB bus-powered 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 3 channel CCDs and 1 channel CIS sensors.
鈥?3 (R, G, and B) 12-bit, user-programmable gamma correction
tables.
鈥?Compatible with a wide range of color linear CCDs and
Contact Image Sensors (CIS).
鈥?Operates with 48MHz external crystal.
鈥?Internal bandgap voltage reference.
鈥?100 pin TQFP package
Applications
鈥?/div>
鈥?/div>
Color Flatbed Document Scanners
Color Sheetfed Document Scanners
Key Specifications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Analog to Digital Converter Resolution
Maximum Pixel Conversion Rate
A4 Color 150dpi scan time
A4 Color 300dpi scan time
A4 Color 600dpi scan time
Supply Voltage
- LM9831
- LM9831 DRAM I/O
Typical Operating Current Consumption
14 Bits
6MHz
<10 seconds
<40 seconds
<160 seconds
+4.75V to +5.25V
+2.85 to +5.25V
134mA
Features
鈥?14 bit ADC digitizes at up to 6Mpixels/s (2M RGB pixels/sec).
鈥?Digital Pixel Processing provides 1200, 800, 600, 400, 300,
200, 150, and 100dpi horizontal resolution from a 1200dpi
sensor and 600, 400, 300, 200, 150, 100, 75, and 50dpi
horizontal resolution from a 600dpi sensor.
鈥?Provides 50-2400dpi vertical resolution in 1 dpi increments.
鈥?Pixel rate error correction for gain (shading) and offset errors.
鈥?Supports 4 or 16Mbit external DRAMs.
鈥?Multiple CCD clocking rates allows matching of CCD clock to
scan resolution and pixel depth for maximum scan speed.
LM9831 Scanner System Block Diagram
+24V
USB
Port
2
1-3
2-6
Illumination
30
1-3
48MHz Crystal
DRAM
Optional Serial
EEPROM
2
8
CCD/CIS
MISC
I/O
Power
Transistors
Stepper
Motor
LM9831CCVJD
TRI-STATE廬 is a registered trademark of National Semiconductor Corporation.
漏1999 National Semiconductor Corporation
1
www.national.com

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