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AD9765:  12-Bit, 125 MSPS Dual TxDAC+® Digital-to-Analog Converter

Product Details


The AD9763/AD9765/AD9767 are dual-port, high speed, 2-channel, 10-/12-/14-bit CMOS DACs. Each part integrates two high quality TxDAC+® cores, a voltage reference, and digital interface circuitry into a small 48-lead LQFP. The AD9763/ AD9765/AD9767 offer exceptional ac and dc performance while supporting update rates of up to 125 MSPS.

The AD9763/AD9765/AD9767 have been optimized for processing I and Q data in communications applications. The digital interface consists of two double-buffered latches as well as control logic. Separate write inputs allow data to be written to the two DAC ports independent of one another. Separate clocks control the update rate of the DACs.

A mode control pin allows the AD9763/AD9765/AD9767 to interface to two separate data ports, or to a single interleaved high speed data port. In interleaving mode, the input data stream is demuxed into its original I and Q data and then latched. The I and Q data is then converted by the two DACs and updated at half the input data rate.

The GAINCTRL pin allows two modes for setting the full-scale current (IOUTFS) of the two DACs. IOUTFS for each DAC can be set independently using two external resistors, or IOUTFS for both DACs can be set by using a single external resistor. See the Gain Control Mode section for important date code information on this feature.

The DACs utilize a segmented current source architecture combined with a proprietary switching technique to reduce glitch energy and maximize dynamic accuracy. Each DAC provides differential current output, thus supporting single-ended or differential applications. Both DACs of the AD9763, AD9765, or AD9767 can be simultaneously updated and can provide a nominal full-scale current of 20 mA. The full-scale currents between each DAC are matched to within 0.1%.

The AD9763/AD9765/AD9767 are manufactured on an advanced, low cost CMOS process. They operate from a single supply of 3.3 V to 5 V and consume 380 mW of power.

Product Highlights

  1. The AD9763/AD9765/AD9767 are members of a pin- compatible family of dual TxDACs providing 8-, 10-, 12-, and 14-bit resolution.
  2. Dual 10-/12-/14-Bit, 125 MSPS DACs. A pair of high performance DACs for each part is optimized for low distortion performance and provides flexible transmission of I and Q information.
  3. Matching. Gain matching is typically 0.1% of full scale, and offset error is better than 0.02%.
  4. Low Power. Complete CMOS dual DAC function operates on 380 mW from a 3.3 V to 5 V single supply. The DAC full-scale current can be reduced for lower power operation, and a sleep mode is provided for low power idle periods.
  5. On-Chip Voltage Reference. The AD9763/AD9765/AD9767 each include a 1.20 V temperature-compensated band gap voltage reference.
  6. Dual 10-/12-/14-Bit Inputs. The AD9763/AD9765/AD9767 each feature a flexible dual-port interface, allowing dual or interleaved input data.

Applications

  • Communications
  • Base stations
  • Digital synthesis
  • Quadrature modulation
  • 3D ultrasound
  • FEATURES and BENEFITS

    • 10-/12-/14-bit dual transmit digital-to-analog converters (DACs)
    • 125 MSPS update rate
    • Excellent SFDR to Nyquist @ 5 MHz output: 75 dBc
    • Excellent gain and offset matching: 0.1%
    • Fully independent or single-resistor gain control
    • Dual-port or interleaved data
    • On-chip 1.2 V reference
    • 5 V or 3.3 V operation
    • Power dissipation: 380 mW @ 5 V
    • Power-down mode: 50 mW @ 5 V
    • 48-lead LQFP

    Functional Block Diagram for AD9765

    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.

    Documentation

    Title Content Type File Type
    AD9763/AD9765/AD9767: 10-/12-/14-Bit, 125 MSPS Dual TxDAC+ Digital-to-Analog Converters Data Sheet (Rev G, 08/2011) (pdf, 2690 kB) Data Sheets PDF
    AN-912: Driving a Center-Tapped Transformer with a Balanced Current-Output DAC  (pdf, 246 kB) Application Notes PDF
    AN-320A: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifier, Part 1  (pdf, 1295 kB) Application Notes PDF
    AN-348: Avoiding Passive-Component Pitfalls  (pdf, 931 kB)
    The Wrong Passive Component Can Derail Even the Best Op Amp or Data Converter. Here Are Some Basic Traps to Watch For.
    Application Notes PDF
    AN-237: Choosing DACs for Direct Digital Synthesis  (pdf, 1156 kB) Application Notes PDF
    AN-595: Understanding Pin Compatibility in the TxDAC® Line of High Speed D/A Converters  (pdf, 36 kB) Application Notes PDF
    AN-555: Using the AD9709, AD9763, AD9765, AD9767 Dual DAC Evaluation Board  (pdf, 206 kB) Application Notes PDF
    AN-137: A Digitally Programmable Gain and Attenuation Amplifier Design  (pdf, 52 kB) Application Notes PDF
    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
    AD9765 IBIS Models IBIS Models HTML

    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

    AD9765 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD9765AST Status: Production 48 ld LQFP 48 Ind Tray, 250 $14.44 $12.27 N  Material Info Notify Me Purchase
    AD9765ASTRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $12.27 N  Material Info Notify Me Purchase
    AD9765ASTZ Status: Production 48 ld LQFP 48 Ind Tray, 250 $12.50 $10.63 Y  Material Info PCN Purchase Sample
    AD9765ASTZRL Status: Production 48 ld LQFP 48 Ind Reel, 2000 - $10.63 Y  Material Info PCN Purchase
    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.

    AD9765 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD9765-EBZ Status: Production Evaluation Board $303.60 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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