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AD9777:  16-Bit 160 MSPS 2x/4x/8x Interpolating Dual TxDAC+® D/A Converter

Product Details

The evaluation board for this product is obsolete with no replacement.
Newer Alternatives:
  • AD9125 Dual, 16-Bit, 1000 MSPS, TxDAC+® Digital-to-Analog Converter

The AD9777 is the 16-bit member of a new pin-compatible family of high-speed dual Interpolating TxDAC+® converters with a maximum input data rate of 160 MSPS (no interpolation) and maximum DAC update rate of 400 MSPS (8x interpolation). They feature a selectable interpolation rate (2x/4x/8x) and a complex modulator that can mix at Fs/2, Fs/4 or Fs/8. All configuration is accomplished through an easy to use 3- or 4-wire SPI interface.

When used with an external quadrature modulator (such as the AD8345/AD8346/AD8349) the AD977X can be used implement a more traditional baseband I/Q architecture or an image reject upconversion architecture by using its internal complex (I&Q) mixer. The latter architecture may be well suited for those applications demanding high modulation accuracy (i.e. 64 QAM) that digital modulation inherently provides. This offers the added benefit of suppressing the image inherent in an analog mixing operation, consequently reducing the number of filtering stages, and therefore the cost of the hardware required to achieve 3G and broadband spectral emission specifications. User-accessible Gain and Offset correction is accessed through the SPI port and improves sideband suppression and LO feedthrough, respectively. A direct IF mode allows synthesis of intermediate frequencies (IFs) above 70 MHz.

TxDAC+ is a registered trademark of Analog Devices, Inc.

  • Communications
  • Analog quadrature modulation architecture
  • 3G, multicarrier GSM, TDMA, CDMA systems
  • Broadband wireless, point-to-point microwave radios
  • Instrumentation/ATE


  • 16-bit resolution, 160 MSPS/400 MSPS input/output data rate
  • Selectable 2×/4×/8× interpolating filter
  • Programmable channel gain and offset adjustment
  • fS/4, fS/8 digital quadrature modulation capability
  • Direct IF transmission mode for 70 MHz + IFs
  • Enables image rejection architecture
  • Fully compatible SPI® port
  • Excellent ac performance SFDR −73 dBc @ 2 MHz to 35 MHz WCDMA ACPR 71 dB @ IF = 19.2 MHz
  • Internal PLL clock multiplier
  • Selectable internal clock divider
  • Versatile clock input Differential/single-ended sine wave or TTL/CMOS/LVPECL compatible
  • Please see data sheet for additional features

Functional Block Diagram for AD9777

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
AD9777: 16-Bit 160 MSPS 2x/4x/8x Interpolating Dual TxDAC+® D/A Converter Data Sheet (Rev C, 01/2006) (pdf, 1770 kB) Data Sheets 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-748: Set-Up and Hold Measurements in High Speed CMOS Input DACs  (pdf, 812 kB) Application Notes PDF
AN-320B: CMOS Multiplying DACs and Op Amps Combine to Build Programmable Gain Amplifiers, Part 2  (pdf, 989 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-642: Coupling a Single-Ended Clock Source to the Differential Clock Input of Third-Generation TxDAC® and TxDAC+® Products  (pdf, 479 kB) Application Notes PDF
AN-640: Synchronizing Multiple AD9777s Using DATACLK Input Mode  (pdf, 0) 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-137: A Digitally Programmable Gain and Attenuation Amplifier Design  (pdf, 52 kB) Application Notes PDF
AN-302: 02: Exploit Digital Advantages in an SSB Receiver  (pdf, 417 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
AD9777 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
AD9777 IBIS Models IBIS Models HTML

Evaluation Kits & Symbols & Footprints

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.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended Quadrature Modulators for the AD9777 Recommended I/V Amplifiers for the AD9777 Recommended Clock Drivers for the AD9777

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

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Price, packaging, availability

AD9777 Model Options
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.

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