Mixed Signal/Analog

Industry's highest performing 2GSPS data converter

28th May 2014
Nat Bowers

Able to discern smaller signals in the presence of noise, clutter, blockers and interferers, the 12-bit, 2GSPS, AD9625 ADC has been introduced by Analog Devices. The manufacturer has claimed that it offers the best noise and dynamic range performance in its class for better receiver sensitivity.

This breakthrough performance combined with 2GSPS bandwidth and integrated signal processing functionality enables the trend to direct RF sampling in communications, instrumentation and military/aerospace applications. The converter’s superior noise spectral density of 149.5dBFS/Hz, coupled with high-input bandwidth, allow designers to use undersampling system architectures into the 2nd Nyquist zone, saving on a frequency down-conversion stage.

The AD9625 is the latest addition to ADI’s wideband RF data acquisition technology portfolio that provides previously unavailable dynamic performance for better signal extraction in congested RF environments over a wider bandwidth than ever before. The device is interoperable with FPGAs from major manufacturers and supported with known good configurations. Combined with the recently announced the 14-bit, 1GSPS AD9680 ADC, the AD9625 demonstrate ADI’s innovation in providing leading edge offerings driving the trend toward direct RF sampling.

The ADC’s wider input bandwidth enables advanced RF sampling architectures and allows designer to reduce the number of analogue frequency down-conversion stages and their associated noise and cost contributions. The simplified system architecture eliminates the need to interleave multiple ADCs to obtain needed performance and allows for development of reconfigurable platforms. It is available with an evaluation board design environment and reference designs to simplify system prototyping and board-level design and layout.

The AD9625 achieves 75dBc spurious-free dynamic range (SFDR) with a 1GHz input, permitting designers to improve measurement accuracy and achieve more dynamic range than any comparable converter on the market today. The AD9625 is the only open-market-available 12-bit, 2GSPS, ADC that simplifies the digital interfacing challenge by integrating two digital-down converters (DDC), two numerically controlled oscillators (NCO) and a configurable JESD204B serial link for the output data. These industry firsts improve usability and functionality by reducing output data rate requirements and simplifying board-level design and layout. Key applications include ultra-wideband RADAR, wideband front-ends for digital storage oscilloscopes and data acquisition platforms.

Each GSPS converter is supported by an evaluation board with a FPGA Mezzanine Card (FMC) connector, software, tools, SPI controller and reference designs. ADI’s VisualAnalog software package combines a powerful set of simulation and data analysis tools with a user-friendly graphical interface allowing designers to customise their input signal and data analysis. The high-speed ADC SPI controller tool allows users to control advanced features with SPI capability. A data capture card is required for prototyping.

The AD9625 is available now in a 196-ball 12x12mm package, priced at $625 (USD) each in 1,000 unit quantities.

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