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ADC offers sampling at up to 3.6GSPS

Posted: 15 Jul 2011     Print Version  Bookmark and Share

Keywords:ADC  RF signals  IMD3 

National Semiconductor Corp. introduces a family of analogue-to-digital converters (ADCs) that are said to be the industry's first to directly sample RF signals beyond 2.7GHz, with third-order intermodulation distortion (IMD3) up to -71dBc and sampling at up to 3.6GSPS.

The ADC12Dxx00RF family includes five 12bit ADCs that enable system designers to eliminate multiple intermediate frequency (IF) down-conversion stages including amplifiers, mixers and filters. A single ADC12Dxx00RF replaces entire radio signal path sub-systems, reducing bill of materials (BOM) cost, board size and weight in 3G/4G wireless basestations as well as microwave backhaul, military and wideband software-defined radio (SDR) applications.

"Radio designers are seeking new ways to increase radio capacity while reducing cost, size and weight. Architectures based on RF sampling ADCs provide these benefits, but it has long been believed that this technology was years away from reality," said Jon Baldwin, marketing director for National's High-Speed Signal Path division. "With its combination of unparalleled high frequency dynamic range and industry's highest sampling rates, the ADC12Dxx00RF family of ADCs provides the core technology that enables our customers to begin development of direct RF-sampling radios today."

The footprint-compatible ADC12Dxx00RF ADCs join National's GSPS ADC family, allowing an easy upgrade path from 500MSPS to 3.6GSPS.

The linearity of these direct RF-sampling ADCs across all frequencies allows more system margin to be shifted to other components, easing their performance requirements and providing additional cost and design time savings. To form a complete signal path solution, the ADC12Dxx00RF ADC can be teamed with one of National's dual-channel, digitally-controlled variable gain amplifiers (DVGA) or the LMH6554 fully differential amplifier, and LMX2541 frequency synthesiser or one of National's LMK04800 clock jitter cleaners.

The ADC12Dxx00RF ADCs are available now and all five 12bit RF-sampling ADCs are offered in pin-compatible, thermally-enhanced 292-ball BGA packages.

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