LM9833 Datasheet | National Semiconductor

Description The LM9833 is a plete 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/16 bit gray, and has output data formats for 48 and 24bit color/16 and 8 bit gray. The LM9833 supports sensors with pixel counts of up to 16384 pixels x 3 colors (1200 dpi x 13.6 inches). The LM9833’s low operating and suspend mode supply currents allow design of USB bus-powered scanners. The only additional active ponents required are an external 4Mbit or 16Mbit DRAM for data buffering and power transistors for the stepper motor. Features - 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 puters. - 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....