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ADI 12-bit CMOS, CCD AFEs target high-end imaging apps

Posted: 03 Dec 2002 ?? ?Print Version ?Bookmark and Share

Keywords:analog devices? ad9821? ad9845b? analog front end? cmos sensor?

Analog Devices Inc. has announced the availability of the AD9821 12-bit CMOS and AD9845B 12-bit CCD analog front-end (AFE) converters for CMOS and CCD imaging sensors used in high-end digital still cameras and camcorders such as machine vision, biomedical imaging, and crash-test analysis imaging systems.

"Our expertise in technology for the consumer digital still camera market has made the entry into professional imaging market a natural next step," said Willard Bucklen, product line director, High Speed Converters, Analog Devices. "Our solutions now offer industrial and scientific imaging designers the best noise performance in the industry along with the high levels of integration necessary to acquire, condition, and digitize high-resolution images."

Claimed to be the industry's first 12-bit, 40MSa/s AFE, the AD9821 is designed to interface with CMOS imagers via a differential sensor input. It includes a low-noise optical black clamp and a 0dB to 36dB, 10-bit programmable gain amplifier. Packaged in a 7-by-7mm, 48-pin LQFP, the AD9821 dissipates 150mW, enabling longer battery life in portable applications.

The AD9845B is a 12-bit, 30MSa/s AFE and is designed for high-speed, high-resolution CCD imaging applications, such as scientific and industrial imaging devices, as well as digital still cameras and camcorders. It features an integrated 6-bit resolution pixel gain amplifier to deliver better image quality, by allowing gain to be finely tuned to fit the image.

The 48-pin LQFP device also a 30MSa/s correlated double sampler and a 2dB to 36dB 10-bit variable gain amplifier. It also provides an input clamp, black level clamp, and input modes for processing analog video signals. Its internal registers are programmed through a 3-wire serial digital interface.

Programmable features include gain adjustment, black level adjustment, input confirmation and power-down modes. The AD9845B operates from a single 3V power supply and typically dissipates 153mW.





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