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AD9779A:  Dual 16-Bit, 1 GSPS, Digital-to-Analog Converter

Product Details


The AD9776A/AD9778A/AD9779A are dual, 12-/14-/16-bit, high dynamic range digital-to-analog converters (DACs) that provide a sample rate of 1 GSPS, permitting a multicarrier generation up to the Nyquist frequency. They include features optimized for direct conversion transmission applications, including complex digital modulation and gain and offset compensation. The DAC outputs are optimized to interface seamlessly with analog quadrature modulators such as the ADL537x FMOD series from Analog Devices, Inc. A 3-wire interface 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 a 100-lead thin quad flat package (TQFP).

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 setup and hold.
  5. Novel 2×, 4×, and 8× interpolator/coarse complex modulator allows carrier placement anywhere in DAC bandwidth.

Applications

  • Wireless infrastructure: W-CDMA, CDMA2000, TD-SCDMA, WiMax, GSM, LTE
  • Digital high or low IF synthesis
  • Internal digital upconversion capability
  • Transmit diversity
  • Wideband communications: LMDS/MMDS, point-to-point

FEATURES and BENEFITS

  • Chinese data sheet available
  • Low power: 1.0 W @ 1 GSPS, 600 mW @ 500 MSPS, full operating conditions
  • Single carrier WCDMA ACLR = 80 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

Functional Block Diagram for AD9779A

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Documentation

Title Content Type File Type
AD9776A/AD9778A/AD9779A: Dual 12-/14-/16-Bit, 1 GSPS, Digital-to-Analog Converters Data Sheet (Rev B, 09/2008) (pdf, 1171 kB) Data Sheets PDF
AN-0974: Multicarrier TD-SCMA Feasibility  (pdf, 634 kB) Application Notes PDF
AN-919: AD9779A/AD9788: Guaranteeing PLL Lock Over Temperature  (pdf, 74 kB) Application Notes 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-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC  (pdf, 246 kB) Application Notes PDF
CN-0021: Interfacing the ADL5375 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC  (pdf, 132 kB) Circuit Note PDF
CN-0020: Interfacing the ADL5374 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC  (pdf, 127 kB) Circuit Note PDF
CN-0019: Interfacing the ADL5373 I/Q Modulator to the AD9779A  (pdf, 127 kB) Circuit Note PDF
CN-0018: Interfacing the ADL5372 I/Q Modulator to the AD9779A  (pdf, 122 kB) Circuit Note PDF
CN-0017: Interfacing the ADL5371 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC  (pdf, 122 kB) Circuit Note PDF
CN-0016: Interfacing the ADL5370 I/Q Modulator to the AD9779A Dual-Channel, 1 GSPS High Speed DAC  (pdf, 122 kB) Circuit Note PDF
Digital to Analog Converters ICs Solutions Bulletin  (pdf) Solutions Bulletins PDF
Digital-to-Analog Converter ICs Solutions Bulletin, Volume 10, Issue 1  (pdf, 1809 kB) 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
AD9779A IBIS Models  (ibs) IBIS Models IBS

Evaluation Kits & Symbols & Footprints

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

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Product Recommendations & Reference Designs

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Companion Products

Suggested Companion Products


Recommended Quadrature Modulators for the AD9779A
  • For 3V power supplies, we suggest the AD8345 and AD8346 quadrature modulators.
Recommended I/V Amplifier for the AD9779A Recommended Clock Drivers for the AD9779A

Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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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.

AD-DAC-FMC-ADP
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD-DAC-FMC-ADP Status: Production FMC to High-Speed DAC Evaluation Board Adaptor $125.00 Yes -
AD9779A Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9779A-DPG2-EBZ Status: Production Evaluation Board $300.00 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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