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

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 ...More

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

Product Description

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

  • Ultralow noise and intermodulation distortion (IMD) enable high quality synthesis of wideband signals from baseband to high intermediate frequencies.
  • A proprietary DAC output switching technique enhances dynamic performance.
  • The current outputs are easily configured for various single-ended or differential circuit topologies.
  • CMOS data input interface with adjustable setup and hold.
  • 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

Data Sheet, Rev. B, 9/08

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  • 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
  • Resolution (Bits): 16bit
  • DAC Update Rate: 1GSPS
  • DAC Settling Time: n/a
  • # DAC Outputs: 2
  • DAC Type: Current Out
  • DAC Input Format: Par
  • Output FSR: (0-10mA),(0-20mA),(0-24mA),Adj(10mA FS to 30mA FS)
  • Ref Int/Ext: Int
  • Supply Vnom: Multi(+1.8, +3.3)
  • Pwr Diss: 300mW
  • Package: QFP

Functional Block Diagram for AD9779A

Circuits from the Lab

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Part# Bits Update Rate Settling Time # Outputs
AD9779A 16 1GSPS - 2
AD9779 16 1GSPS - 2
AD9778 14 1GSPS - 2
AD9778A 14 1GSPS - 2
AD9776A 12 1GSPS - 2
AD9788 16 800MSPS - 2
AD9783 16 500MSPS - 2
AD9777 16 400MSPS 11ns 2
AD9747 16 250MSPS - 2
AD5545 16 2MSPS 500ns 2
AD5547 16 2MSPS 500ns 2
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Model
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  • Last Time Buy: The model has been scheduled for obsolescence, but may still be purchased for a limited time.
  • Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).
Package Description
The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

Pin Count
Pin Count is the number of pins, balls, or pads on the device. Pin-out diagrams & pin function descriptions may be found in the datasheet.

Temperature Range
This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
Price
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.

Production Availability
This is the date Analog Devices, Inc. anticipates that the product will ship from the warehouse. Most orders ship within 48 hours of this date.Once an order has been placed, Analog Devices, Inc. will send an Order Acknowledgement email to confirm your delivery date. It is important to note the scheduled dock date on the order entry screen. We do take orders for items that are not in stock, so delivery may be scheduled at a future date. Also, please note the warehouse location for the product ordered. We have warehouses in the United States, Europe and Southeast Asia. Transit times from these sites may vary.
Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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Due to environmental concerns, ADI offers many of our products in lead-free versions. For more information about lead-free parts, please consult our Pb (Lead) free information page.

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This is the list of Product Change Notifications (PCN) published on the web for this model. Click on the link to access PCN Information.Only select pre-2009 PCN�s are available on-line. To obtain a pre-2009 PCN, contact your ADI Sales Rep. For more information on ADI's PCN process, please visit our PCN Policy Statement page

*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.