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AD9761:  10-Bit, Complete, 40 MSPS, dual Transmit D/A Converter

Product Details


The AD9761 is a complete dual channel, high speed, 10-bit CMOS DAC. The AD9761 has been developed specifically for use in wide bandwidth communication applications (e.g., spread spectrum) where digital I and Q information is being processed during transmit operations. It integrates two 10-bit, 40 MSPS DACs, dual 2x interpolation filters, a voltage reference, and digital input interface circuitry. The AD9761 supports a 20 MSPS per channel input data rate that is then interpolated by 2x up to 40 MSPS before simultaneously updating each DAC.

The interleaved I and Q input data stream is presented to the digital interface circuitry, which consists of I and Q latches as well as some additional control logic. The data is de-interleaved back into its original I and Q data. An on-chip state machine ensures the proper pairing of I and Q data. The data output from each latch is then processed by a 2x digital interpolation filter that eases the reconstruction filter requirements. The interpolated output of each filter serves as the input of their respective 10-bit DAC.

The DACs utilize a segmented current source architecture combined with a proprietary switching technique to reduce glitch energy and to maximize dynamic accuracy. Each DAC provides differential current output thus supporting single-ended or differential applications. Both DACs are simultaneously updated and provide a nominal full-scale current of 10 mA. Also, the full-scale currents between each DAC are matched to within 0.07 dB (i.e., 0.75%), thus eliminating the need for additional gain calibration circuitry.

The AD9761 is manufactured on an advanced low cost CMOS process. It operates from a single supply of 2.7 V to 5.5 V and consumes 200 mW of power. To make the AD9761 complete it also offers an internal 1.20 V temperature-compensated bandgap reference.

FEATURES and BENEFITS

  • Complete 10-Bit, 40 MSPS Dual Transmit DAC
  • Excellent Gain and Offset Matching
  • Differential Nonlinearity Error: 0.5 LSB
  • Effective Numbe of Bits: 9.5
  • Signal-to-Noise and Distortion Ratio: 59 dB
  • Spurious-Free Dynamic Range: 71 dB
  • 2x Interpolation Filters
  • 20 MSPS/Channel Data Rate
  • Single Supply: 3V to 5.5 V
  • Low Power Dissipation: 93 mW
    (3 V Supply @ 40 MSPS)
  • On-Chip Reference
  • 28-Lead SSOP

Functional Block Diagram for AD9761

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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
AD9761 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.

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Price, packaging, availability

AD9761 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9761ARS Status: Production 28 ld SSOP 28 Ind Tube, 47 $12.57 $10.67 N  Material Info PCN Purchase
AD9761ARSRL Status: Production 28 ld SSOP 28 Ind Reel, 1500 - $10.67 N  Material Info PCN Purchase
AD9761ARSZ Status: Production 28 ld SSOP 28 Ind Tube, 47 $10.36 $8.80 Y  Material Info PCN Purchase Sample
AD9761ARSZRL Status: Production 28 ld SSOP 28 Ind Reel, 1500 - $8.80 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.

AD9761 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD9761-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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