Microwave Journal

ADI Unveils Continuous-time Sigma-delta Analog-to-digital Converters

November 20, 2008

Analog Devices Inc., a leader in data converter technology, unveiled its continuous-time sigma-delta (CTSD) converter architecture for wireless infrastructure, medical and other high-performance equipment demanding uncompromised data resolution and wide bandwidth. The 16-bit, AD9261 and AD9262 CTSD converter, and the AD9267 CTSD modulator couple the industry’s lowest noise and high dynamic range with a bandwidth of up to 10 MHz.

“Today’s electronics increasingly rely on data conversion to faithfully translate digital information to provide the images, voice, audio, video and other real-world content that defines the quality of the end-user experience,” said Susie Inouye, research director, Databeans Inc., a leading semiconductor research firm. “While other architectures have pushed the performance envelope by offering exceptional throughput, high dynamic range or excellent low-noise characteristics, continuous-time sigma-delta excels in all of these areas.”

The highly integrated CTSD architecture eliminates multiple discrete components at the system level, while simultaneously improving performance and simplifying product development.

The AD926x utilizes principles of over sampling, noise shaping and input characteristics unique to its architecture to achieve high levels of performance and ease of use. The quiet resistive input structure relaxes the requirements of the driver amplifier while the high order over-sampled continuous time loop filter attenuates out-of-band signals reducing the need for large baseband filters and other signal conditioning circuitry. The high dynamic range performance reduces or eliminates the need for automatic gain control in many applications. These features coupled with a wide input bandwidth simplify system design, reducing the overall system footprint and shortening time-to-market.