LM9832

LM9832 42-Bit Color 1200dpi USB Image Scanner April 2000 N LM9832 42-Bit Color, 1200dpi USB Image Scanner General Description The LM9832 is a complete USB image scanner system on a single IC. The LM9832 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 LM9832 scans images in 42 bit color/14 bit gray, and has output data formats for 42 and 24 bit color/14 and 8 bit gray. The LM9832 supports sensors with pixel counts of up to 16384 pixels x 3 colors (1200 dpi x 13.6 inches). The LM9832’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 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...