LM9833

LM9833 48-Bit Color 1200dpi USB Image Scanner October 2001 LM9833 48-Bit Color, 1200dpi USB Image Scanner General Description 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/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 components 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 ...