The LM9833 is a complete USB image scanner system on a single IC. The LM9833 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 LM9833 scans images in 48 bit color or 16 bit gray, and has output data formats for 24, 36, and 48 bit color or 8, 12, and 16 bit gray. The LM9833 supports sensors with pixel counts of up to 16384 pixels × 3 colors (1200 dpi × 13.6 inches).
The LM9833s 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.
48 bit color and 16 bit gray output modes
16 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 Specification
Analog to Digital Converter Resolution . . . 16 Bits
