DAC easy to interface with FPGAs

14 November 2012 Analogue, Mixed Signal, LSI

Analog Devices premiered the AD9128, a 16-bit, 1,25 GSps transmit D/A converter (DAC) with integrated complex digital modulation functionality, and featuring a JESD204A-compatible serial input. This high-speed serial interface greatly simplifies and improves the data connection between the DAC and the FPGA in a typical system implementation.

High-performance FPGAs are increasingly being utilised as processors in many data-centric wireless and wired communications, radar, avionics and medical imaging applications. FPGAs are gaining favour due to their inherent advantages of easier system development, reduced time to market, higher processing speed and on-the-fly programmability.

However, for higher-resolution, 1 GSps+ data converter applications, data transfers in and out of an FPGA have traditionally been a design bottleneck because of interface bit-rate limitations, interconnect layout complexity and parallel interface board space requirements. JESD204 was specifically developed to remedy these constraints by defining a robust high-speed serial interface that is scalable and accommodates data rates in the multiple Gbps range.

The JESD204A-compliant AD9128 offers high sampling rate and high dynamic range, enabling multicarrier generation up to the Nyquist frequency, and includes features such as an on-chip 32-bit NCO (numerically-controlled oscillator), allowing flexible placement of the IF (intermediate frequency), complex digital modulation, and gain and offset compensation.

A 4-wire serial port interface provides for programming and read-back of many of the device’s internal parameters and functions. The IC supports GSM, WCDMA, TD-SCDMA, CDMA2000, WiMAX and LTE wireless communications standards.

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