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AD9779:  Dual 16-Bit, 1 GSPS, Digital-to-Analog Converter

Product Details

The AD9776/AD9778/AD9779 are dual, 12-/14-/16-bit, high dynamic range, digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmit applications, including complex digital modulation, and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quad-rature modulators such as the AD8349. A serial peripheral interface (SPI®) provides for programming/readback of many internal parameters. Full-scale output current can be programmed over a range of 10 mA to 30 mA. The devices are manufactured on an advanced 0.18 μm CMOS process and operate on 1.8 V and 3.3 V supplies for a total power consumption of 1.0 W. They are enclosed in 100-lead TQFP packages.

Product Highlights

  1. Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.
  2. A proprietary DAC output switching technique enhances dynamic performance.
  3. The current outputs are easily configured for various single-ended or differential circuit topologies.
  4. CMOS data input interface with adjustable set up and hold.
  5. Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth.


  • Wireless infrastructure
  • Digital high or low IF synthesis
  • Internal digital upconversion capability
  • Transmit diversity
  • Wideband communications: LMDS/MMDS, point-to-point
  • Data Sheet, Rev. A, 3/07


    • Low power: 1.0 W @ 1 GSPS, 600 mW @ 500 MSPS, full operating conditions
    • SFDR = 78 dBc to fOUT = 100 MHz
    • Single carrier WCDMA ACLR = 79 dBc @ 80 MHz IF
    • Analog output: adjustable 8.7 mA to 31.7 mA, RL = 25 Ω to 50 Ω
    • Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth
    • Auxiliary DACs allow control of external VGA and offset control
    • Multiple chip synchronization interface
    • High performance, low noise PLL clock multiplier
    • Digital inverse sinc filter
    • 100-lead, exposed paddle TQFP package

    Functional Block Diagram for AD9779

    The AD9779 is no longer recommended for new designs. The AD9779A is the recommended replacement.

    For evaluation of all Analog Devices High Speed DAC components you will need to purchase or loan a Data Pattern Generator. To find out more information please click here.


    Title Content Type File Type
    AD9776/AD9778/AD9779: Dual 12-/14-/16-Bit, 1 GSPS, Digital-to-Analog Converters Data Sheet (Rev A, 03/2007) (pdf, 1525 kB) Data Sheets PDF
    AN-0996: The Advantages of Using a Quadrature Digital Upconverter (QDUC) in Point-to-Point Microwave Transmit Systems  (pdf, 219 kB) Application Notes PDF
    AN-808: Multicarrier CDMA2000 Feasibility  (pdf, 1535 kB)
    The goal of this application note is to determine the feasibility of implementing a multicarrier CDMA2000 transceiver and what the major subsystem performances must be.
    Application Notes PDF
    AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC  (pdf, 246 kB) Application Notes PDF
    AN-822: Synchronization of Multiple AD9779 TxDACs  (pdf, 129 kB) Application Notes PDF
    AN-748: Set-Up and Hold Measurements in High Speed CMOS Input DACs  (pdf, 812 kB) Application Notes PDF
    Design A Clock-Distribution Strategy With Confidence
    by Demetrios Efstathiou (Electronic Design, April 27, 2006)
    Technical Articles HTML
    Analog Devices Doubles 16-Bit Converter Speed To One Billion Samples Per Second
    (Wireless Design Online, 1/12/2005)
    Product Reviews HTML
    ADI Revs Signal Converters
    (EE Times, January 10, 2005)
    Product Reviews HTML
    Dual 14-Bit ADC Supports 3G and WiMAX Basestations
    (eeProductCenter, 12/18/2006)
    Product Reviews HTML
    The World is Still Analog
    (Test & Measurement World, 6/1/2006)
    Product Reviews HTML
    ADI Rolls Out Two High-Speed Converters
    (EDN, 1/11/2005)
    Product Reviews HTML
    Dual 14-Bit ADC Speeds Up to WiMAX
    (Electronicstalk, 12/20/2006)
    Product Reviews HTML
    ADI Unveils Two High-Speed Converters For Wireless Applications
    (eeProductCenter, 1/10/2005)
    Product Reviews HTML
    Digital to Analog Converters ICs Solutions Bulletin  (pdf) Solutions Bulletins PDF
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    DAC Harmonic Analyzer
    This tool displays harmonic images and spurs in a DAC output. The user can define a post-DAC analog filter to suppress these images. The effect of this filter is plotted on the graph and shown in the accompanying chart.
    DAC Harmonic Analyzer HTML
    AD9779 IBIS Models  (ibs) IBIS Models IBS

    Evaluation Kits & Symbols & Footprints

    Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

    Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

    SampleSample & Buy

    Price, packaging, availability

    Price Table Help

    The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

    Model Description Price RoHS View PCN/ PDN Check Inventory/
    AD-DAC-FMC-ADP Status: Production FMC to High-Speed DAC Evaluation Board Adaptor $125.00 Yes -

    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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