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LM9831 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM9831 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 41 page  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 14 Bits • Maximum Pixel Conversion Rate 6MHz • A4 Color 150dpi scan time <10 seconds • A4 Color 300dpi scan time <40 seconds • A4 Color 600dpi scan time <160 seconds • Supply Voltage - LM9831 +4.75V to +5.25V - LM9831 DRAM I/O +2.85 to +5.25V • Typical Operating Current Consumption 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 8MISC I/O ©1999 National Semiconductor Corporation TRI-STATE® is a registered trademark of National Semiconductor Corporation. October 1999 N |
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