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National Semiconductor Announces Industry?s First Complete Scanner-on-a-Chip

Nov 30, 1998

November 30, 1998 ? National Semiconductor Corporation today introduced the industry?s first system-on-a-chip solution for color image and document scanners. The LM9830 incorporates all the functions of a high-performance color scanner, including analog front end, sensor clock generation, microstepping motor control, data buffering and parallel port interface, into a single integrated circuit.

?National?s innovative, single-chip design sets a new standard in price/performance for image and document scanners,? said Bill Stacy, vice president of National?s System Products Group. ?The LM9830 enables superior image quality and significantly higher speeds than the multiple chips used in current scanners. It also shortens our customers? time-to-market by minimizing their electronics and software design.?

?This chip is a perfect example of National?s strategic direction,? Stacy added. ?We?ve implemented the LM9830 system-on-a-chip solution using the company?s analog expertise as a starting point for forward integration.?

Using a 6MHz, 12-bit ADC with pipelined architecture, National?s LM9830 operates at a 6 million pixels/second conversion rate and scans images in full 36-bit color. The LM9830 incorporates digital offset and shading correction, as well as all the analog processing functions that National built into earlier imaging products, such as gain offset and correlated double sampling. In addition, digital pixel processing and individual RGB gamma tables enable the new part to provide a variety of high-quality resolutions from 50 to 600 dpi horizontal. Vertical resolutions are also 50-600 dpi in one dpi increments.

The LM9830 has fine control over system clock rates, which allows matching the scanner clock rate to the parallel port interface speed. This improvement results in scan speeds that are as much as 4X faster than current parallel scanners. By zooming in on a subset of CCD pixels, the device can transmit an arbitrary range of pixels to speed up the scanning of smaller items such as business cards. Pixel depths of 1, 2, or 4 bits are packed into bytes for faster scans of line art and low pixel depth images.

The microstepper motor controller determines the effective vertical resolution and moves the sensor over the image at a constant speed. A PWM current-control option for the stepper motor delivers the high torque and smooth movement needed for faster scans and superior images. This feature also allows use of a less expensive motor with a lower current rating.

The LM9830 is powered by a single 5V source and typically dissipates just 350mW. It includes a low-power standby mode for powerdown capability. National also provides complete TWAIN driver software and support.

Price and Availability
Available now in a 100-lead TQFP (thin quad flat pack), the LM9830VJD is priced at $10.00 in 1000-unit quantities.

For more information on the LM9830, visit our World Wide Web site at http://www.national.com/pf/LM/LM9830.html National Semiconductor provides system-on-a-chip solutions for the information age. Combining real-world analog and state-of the-art digital technology, the company's chips lead many sectors of the personal computer, communications, and consumer markets. With headquarters in Santa Clara, California, National has annual sales of approximately $2.5 billion and 12,000 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.