Analog Devices' 2.5-Gsample/sec ADC, driver amplifier and rapid prototyping FMC module

June 04, 2014 // By Graham Prophet
Analog Devices recently introduced the AD9625 analogue/digital converter, specified at 12 bits and 2 Gsamples/sec, for signal digitisation early in the signal chain of software-defined radios. Now, the company has built a variant of the part – that trades off some parameters for a higher upper-limit sampling speed – into a module that provides all hardware and software for wideband RF GSPS data converter interoperability with FPGA platforms.

ADI's AD-FMCADC2-EBZ FMC module with HDL code and software drivers, is intended to support rapid design prototyping and interoperability with Xilinx FPGAs. The AD-FMCADC2-EBZ board incorporates the 12-bit, 2.5- Gsample/sec AD9625-2.5 A/D converter, introduced at the same time, with input balun, power supplies and software stack. This module provides wideband dynamic performance and integrated functionality and enables development and prototyping of advanced RF sampling architectures. With its 76 dBc of spurious-free dynamic range at 1.8 GHz Ain, the AD9625-2.5's wideband dynamic performance means that designers can capture and process a spectral interval that is four-times “cleaner” than that possible with alternative devices.

A user endorsement comes from Olivier Fouquet, President of Ingespace; “Ingespace has developed a wideband data acquisition system that is based on several AD9625-2.5s....the AD9625-2.5 Gsample/sec .....offers excellent linearity in the DC / 1 GHz band and 80 dB SFDR. In addition, the choice of the JESD204B interface allows us to couple several AD9625-2.5s to the same Virtex7 FPGA, thereby increasing performance by limiting the complexity and the total cost of the system. Finally, its small size and limited power dissipation has enabled us to produce a compact solution that requires a very light dissipation system.” Fouquet adds; “Having developed a DC coupling solution on the analogue input, it is now possible to acquire more than 2 GHz of instantaneous bandwidth by making use of complex sampling. This type of solution has great potential in the fields of telecommunications, aerospace and defence."

A video is at; www.analog.com/AD9625video

The module comes with a content stack of reference designs, software and HDL code to reduce programing and design time for any application. ADI maintains an information resource on its FPGA reference designs at http://wiki.analog.com/resources/fpga

The AD9625 provides better noise and dynamic range performance – a 150 dBFS/Hz noise floor and 80 dBc SFDR out to Nyquist. This level of performance means designers can discern by 4X smaller signals in the