參數(shù)資料
型號(hào)： LM9831
廠商： National Semiconductor Corporation
英文描述： LM9831 42-Bit Color, 1200dpi USB Image Scanner
中文描述： LM9831 42位彩色，1200dpi的USB圖像掃描儀
文件頁(yè)數(shù)： 1/41頁(yè)
文件大?。?/td> 320K
代理商： LM9831
1
www.national.com
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’s 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.
Applications
Color Flatbed Document Scanners
Color Sheetfed Document Scanners
Features
14 bit ADC digitizes at up to 6Mpixels/s (2M RGB pixels/sec).
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.
Provides 50-2400dpi vertical resolution in 1 dpi increments.
Pixel rate error correction for gain (shading) and offset errors.
Supports 4 or 16Mbit external DRAMs.
Multiple CCD clocking rates allows matching of CCD clock to
scan resolution and pixel depth for maximum scan speed.
Stepper motor control tightly coupled with image data buffer
management to maximize data transfer efficiency.
PWM stepper motor current control allows microstepping for
the price of fullstepping.
USB interface for Plug and Play operation on USB-equipped
computers.
Serial EEPROM option for custom Vendor and Product IDs.
Support for USB bus-powered operation.
Pixel depths of 1, 2, or 4 bits are packed into bytes for faster
scans of line art and low pixel depth images.
Supports 3 channel CCDs and 1 channel CIS sensors.
3 (R, G, and B) 12-bit, user-programmable gamma correction
tables.
Compatible with a wide range of color linear CCDs and
Contact Image Sensors (CIS).
Operates with 48MHz external crystal.
Internal bandgap voltage reference.
100 pin TQFP package
Key Specifications
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
LM9831 42-Bit Color, 1200dpi USB Image Scanner
LM9831 Scanner System Block Diagram
CCD/CIS
Illumination
+24V
Stepper
Motor
1-3
1-3
2-6
Power
Transistors
DRAM
30
LM9831CCVJD
USB
Port
2
48MHz Crystal
Optional Serial
EEPROM
2
8
MISC
I/O
L
1999 National Semiconductor Corporation
TRI-STATE is a registered trademark of National Semiconductor Corporation.
October 1999
N
相關(guān)PDF資料
PDF描述
LM9831CCVJDX LM9831 42-Bit Color, 1200dpi USB Image Scanner
LM9832CCVJD LM9832 42-Bit Color, 1200dpi USB Image Scanner
LM9832 LM9832 42-Bit Color, 1200dpi USB Image Scanner
LM9833CCVJD LM9833 48-Bit Color, 1200dpi USB Image Scanner
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM9831CCVJD 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner
LM9831CCVJDX 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner
LM9832 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:LM9832 42-Bit Color, 1200dpi USB Image Scanner
LM9832B-B WAF 制造商:Texas Instruments 功能描述:
LM9832B-E WAF 制造商:Texas Instruments 功能描述:
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