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Dual, 16-Bit, 1.25-GSPS, Digital-to-Analog Converter IC Incorporates a JESD204 Serial Input to Simplify the FPGA Interface

Jun 18 2012 - Norwood, MA
  • Analog Devices, Inc. (ADI), the data converter market share leader* and a data conversion and signal processing technology innovator for over 47 years, today introduced the AD9128, a performance-leading 16-bit, 1.25-GSPS transmit D/A converter (DAC) with integrated complex digital modulation functionality, and featuring a JESD204A-compatible serial input. The AD9128’s 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 utilized as processors in many data-centric wireless and wired communications, radar, avionics, and medical imaging applications. FPGAs are gaining favor 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. ADI is committed to embracing this standard in its ultra-high-speed data-converter technology, and FPGA manufacturers are actively integrating this protocol into their high-performance platforms.

    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 AD9128 supports GSM, WCDMA, TD-SCDMA, CDMA2000, WiMAX, and LTE wireless communications standards.

    View the AD9128 D/A converter product page, order samples, and download the data sheet:

    AD9128 Dual 16-bit D/A Converter for Transmit Signal Chain IF Synthesis

    Pricing, Availability and Complementary Products

    Product Sample Availability Production Release Resolution(Bits) Channels Sample Rate(GSPS) Price Each In 1,000 Quantities Packaging
    AD9128 Now July 16 2 1.25 $34.50 56-lead LFCSP

    The AD9128 high-speed D/A converter’s analog outputs are optimized to interface seamlessly with analog quadrature modulators, such as ADI’s ADL537x F-MOD series, and the ADCLK914 clock/data buffer that drives the AD9128 D/A converter with clock input jitter performance of 110 fs. Other complementary parts include the ADRF6702 quadrature modulator and ADRF6602 Rx mixer.

    Get support at ADI’s EngineerZone™ online technical support community:

    • 1.25 GSPS capability supports IF bandwidths up to 500 MHz
    • Excellent dynamic range:
      80 dBc @ fDAC = 200 MSPS, fOUT = 50 MHz
      72 dBc @ fDAC = 800 MSPS, fOUT = 70 MHz
    • Single-carrier W-CDMA ACLR = 82 dBc @ 122.88 MHz IF
    • Novel 2×/4×/8× interpolator/complex modulator allows carrier placement anywhere within the DAC’s bandwidth
    • Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
    • 4 lanes of high-speed JESD204A serial links (each capable of 3.125 Gbps)
  • About Analog Devices
  • Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices is included in the S&P 500 Index.
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