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AD9959:  4 Channel 500 MSPS DDS with 10-bit DACs

Product Details

Product Status:Recommended for New Designs

The AD9959 consists of four direct digital synthesizer (DDS) cores that provide independent frequency, phase, and amplitude control on each channel. This flexibility can be used to correct imbalances between signals due to analog processing, such as filtering, amplification, or PCB layout-related mismatches. Because all channels share a common system clock, they are inherently synchronized. Synchronization of multiple devices is supported.

The AD9959 can perform up to a 16-level modulation of fre- quency, phase, or amplitude (FSK, PSK, ASK). Modulation is performed by applying data to the profile pins. In addition, the AD9959 also supports linear sweep of frequency, phase, or amplitude for applications such as radar and instrumentation.

The AD9959 serial I/O port offers multiple configurations to provide significant flexibility. The serial I/O port offers an SPI- compatible mode of operation that is virtually identical to the SPI operation found in earlier Analog Devices, Inc., DDS products. Flexibility is provided by four data pins (SDIO_0/SDIO_1/ SDIO_2/SDIO_3) that allow four programmable modes of serial I/O operation.

The AD9959 uses advanced DDS technology that provides low power dissipation with high performance. The device incorporates four integrated, high speed 10-bit DACs with excellent wideband and narrow-band SFDR. Each channel has a dedicated 32-bit frequency tuning word, 14 bits of phase offset, and a 10-bit output scale multiplier.

The DAC outputs are supply referenced and must be terminated into AVDD by a resistor or an AVDD center-tapped transformer. Each DAC has its own programmable reference to enable different full-scale currents for each channel.

The DDS acts as a high resolution frequency divider with the REFCLK as the input and the DAC providing the output. The REFCLK input source is common to all channels and can be driven directly or used in combination with an integrated REFCLK multiplier (PLL) up to a maximum of 500 MSPS. The PLL multiplication factor is programmable from 4 to 20, in integer steps. The REFCLK input also features an oscillator circuit to support an external crystal as the REFCLK source. The crystal must be between 20 MHz and 30 MHz. The crystal can be used in combination with the REFCLK multiplier.

The AD9959 comes in a space-saving 56-lead LFCSP package. The DDS core (AVDD and DVDD pins) is powered by a 1.8 V supply. The digital I/O interface (SPI) operates at 3.3 V and requires DVDD_I/O (Pin 49) be connected to 3.3 V.

The AD9959 operates over the industrial temperature range of −40°C to +85°C.


  • Agile local oscillators
  • Phased array radars/sonars
  • Instrumentation
  • Synchronized clocking
  • RF source for AOTF
  • Data Sheet, Rev. B, 7/08


    • Four synchronized DDS channels @
      500 MSPS
    • Independent frequency / phase / amplitude control between all channels
    • Matched latencies for Freq, Phase, and Amplitude changes
    • Excellent channel to channel isolation
    • Frequency sweeping capability
    • Up to 16 levels of modulation (pin selectable)
    • Programmable DAC full scale current
    • See Data Sheet for Additional Information

    Functional Block Diagram for AD9959


    Title Content Type File Type
    AD9959: 4 Channel 500 MSPS DDS with 10-Bit DACs Data Sheet (Rev B, 07/2008) (pdf, 866 kB) Data Sheets PDF
    AN-953: Direct Digital Synthesis (DDS) with a Programmable Modulus  (pdf, 112 kB) Application Notes PDF
    AN-939: Super-Nyquist Operation of the AD9912 Yields a High RF Output Signal  (pdf, 221 kB) Application Notes PDF
    AN-927: Determining if a Spur is Related to the DDS/DAC or to Some Other Source (For Example, Switching Supplies)  (pdf, 170 kB) Application Notes PDF
    AN-843: Measuring a Loudspeaker Impedance Profile Using the AD5933 (Rev. A, 6/07)  (pdf, 284 kB) Application Notes PDF
    AN-837: DDS-Based Clock Jitter Performance vs. DAC Reconstruction Filter Performance  (pdf, 313 kB) Application Notes PDF
    AN-769: Generating Multiple Clock Outputs from the AD9540  (pdf, 0) Application Notes PDF
    AN-823: Direct Digital Synthesizers in Clocking Applications Time  (pdf, 115 kB)
    Jitter in Direct Digital Synthesizer-Based Clocking Systems
    Application Notes PDF
    AN-851: A WiMax Double Downconversion IF Sampling Receiver Design  (pdf, 262 kB) Application Notes PDF
    AN-847: Measuring a Grounded Impedance Profile Using the AD5933  (pdf, 294 kB) Application Notes PDF
    AN-345: Grounding for Low-and-High-Frequency Circuits  (pdf, 455 kB)
    Know Your Ground and Signal Paths for Effective Designs. Current Flow Seeks Path of Least Impedance-Not Just Resistance....
    Application Notes PDF
    AN-605: Synchronizing Multiple AD9852 DDS-Based Synthesizers  (pdf, 527 kB) Application Notes PDF
    AN-632: Provisionary Data Rates Using the AD9951 DDS as an Agile Reference Clock for the ADN2812 Continuous-Rate CDR  (pdf, 138 kB) Application Notes PDF
    AN-621: Programming the AD9832/AD9835  (pdf, 202 kB)
    This application note details how to program 5 MHz on the output of the AD9832/AD9835 parts. The frequency register,defer register,and command sequence are explained in detail.
    Application Notes PDF
    AN-342: Analog Signal-Handling for High Speed and Accuracy.  (pdf, 468 kB)
    Signal handling techniques for optimizing DAC and ADC performance.
    Application Notes PDF
    AN-280: Mixed Signal Circuit Technologies  (pdf, 2101 kB)
    Considers problems which arise when reality (& Murphy) intervene in a design which otherwise seems satisfactory in terms of theory and modeling.
    Application Notes PDF
    AN-557: An Experimenter's Project:  (pdf, 368 kB)
    Incorporating the AD9850 Complete DDS Device as a Digital LO Function in an Amateur Radio Transceiver
    Application Notes PDF
    AN-419: A Discrete, Low Phase Noise, 125 MHz Crystal Oscillator for the AD9850  (pdf, 101 kB) Application Notes PDF
    AN-237: Choosing DACs for Direct Digital Synthesis  (pdf, 1156 kB) Application Notes PDF
    AN-423: Amplitude Modulation of the AD9850 Direct Digital Synthesizer  (pdf, 37 kB) Application Notes PDF
    AN-587: Synchronizing Multiple AD9850/AD9851 DDS-Based Synthesizers  (pdf, 116 kB) Application Notes PDF
    AN-543: High Quality, All-Digital RF Frequency Modulation Generation with the ADSP-2181 and the AD9850 DDS  (pdf, 49 kB) Application Notes PDF
    CN-0186: Phase Coherent FSK Modulator  (pdf, 239 kB) Circuit Note PDF
    CN-0109: Low Jitter Sampling Clock Generator for High Performance ADCs Using the AD9958/AD9858 500 MSPS/1GSPS DDS and AD9515 Clock Distribution IC  (pdf, 114 kB) Circuit Note PDF
    Fundamentals of Frequency Synthesis, Part 2: Direct Digital Synthesis (DDS)
    This month we conclude our two-part series on frequency synthesis, with an introduction to Direct Digital Synthesis. We will give a basic review of how a direct digital synthesis system works, touching on the inner workings of the DDS engine at a relatively high level. We will also discuss the tradeoffs between PLL and DDS technology as a base choice for frequency synthesis needs.
    Webcasts WEBCAST
    Performance Clocks: Demystifying Jitter
    Join us as we delve into the realm of sub-picosecond jitter clocks. The relationship between jitter and phase noise will be explored in detail and methods for measuring sub-picosecond jitter and ultra low phase noise will be presented and discussed.
    Webcasts WEBCAST
    Speedy A/Ds Demand Stable Clocks
    by Jeff Keip, Analog Devices, Inc. (EE Times, 3/18/04)
    Technical Articles HTML
    Improved DDS Devices Enable Advanced Comm Systems
    by Valoree Young, Analog Devices
    (Electronic Products, September 2006)
    Technical Articles HTML
    ADI Buys Korean Mobile TV Chip Maker
    (EE Times, 6/7/2006)
    Technical Articles HTML
    DDS Device Provides Amplitude Modulation
    by Mary McCarthy, Analog Devices, Inc.
    (EDN, September 2, 1999)
    Technical Articles HTML
    Introducing Digital Up/Down Converters: VersaCOMM™ Reconfigurable Digital Converters  (pdf, 63 kB)
    Revolutionize your radio architectures
    Technical Articles PDF
    Digital Up/Down Converters: VersaCOMM™ White Paper  (pdf, 97 kB) Technical Articles PDF
    Basics of Designing a Digital Radio Receiver (Radio 101)  (pdf, 77 kB) Technical Articles PDF
    The Year of the Waveform Generator
    (Test & Measurement World, 12/1/2005)
    Technical Articles HTML
    Synchronized Synthesizers Aid Multichannel Systems
    by David Brandon and John Kornblum, Analog Devices, Inc. (Microwaves & RF, 9/2005)
    Technical Articles HTML
    DDS Applications
    by Eva Murphy and Colm Slattery, Analog Devices, Inc. (EETimes, 9/26/2005)
    Technical Articles HTML
    DDS IC Initiates Synchronized Signals
    (Microwaves & RF Cover Story, July 2005)
    Technical Articles HTML
    DDS Simplifies Polar Modulation
    By Ken Gentile, Analog Devices ... Basic modulation mathematics and DDS (direct digital synthesis) provide designers with an all-digital technique for generating polar-encoded carrier signals. (EDN, 8/5/2004)
    Technical Articles HTML
    Digital Waveform Generator Provides Flexible Frequency Tuning for Sensor Measurement
    by Colm Slattery, Analog Devices (EDN, 12/17/2004)
    Technical Articles HTML
    Integrated DDS Chip Takes Steps To 2.7 GHz
    This highly integrated 2.7-GHz source includes all essential DDS circuitry along with a clock driver, divider, high-resolution DAC, and combination phase detector/charge pump. (ED Online, April 2004)
    Technical Articles HTML
    DDS IC Plus Frequency-To-Voltage Converter Make Low-Cost DAC
    by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 2/5/2004)
    Technical Articles HTML
    Two DDS ICs Implement Amplitude-shift Keying
    by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 12/25/2003)
    Technical Articles HTML
    DDS Circuit Generates Precise PWM Waveforms
    by Colm Slattery, Analog Devices, Inc. (EDN, 10/2/2003)
    Technical Articles HTML
    Simple Circuit Controls Stepper Motors
    by Noel McNamara, Analog Devices, Inc. (EDN Design Idea, 1/8/04)
    Technical Articles HTML
    Digital Potentiometers Vary Amplitude In DDS Devices  (PDF)
    (Electronic Design, Ideas for Design, 5/29/2000)
    Technical Articles PDF
    AD9858: Flexible Integrated Synthesizer For Wireless  (htm)
    ... The most important feature of the AD9858 is its ability to change frequency in less than 5 ns, meaning that there is virtually no application left where you will need to go the expense of switching between two separate synthesizers. (AnalogZone, RF/IF Zone Products for the Week of 9/23/2002)
    Technical Articles HTM
    DDS Device Produces Sawtooth Waveform
    Ramp or sawtooth waveforms are useful for a broad range of applications, including automatic-test equipment, benchtest equipment, and actuator control. (EDN Design Idea, 7/10/2003)
    Technical Articles HTML
    400-MSample DDSs Run On Only +1.8 VDC
    ... This line of highly integrated DDS ICs features on-board RAM and crystal-oscillator circuitry to simplify the generation of agile and exotic waveforms. (Microwaves & RF Cover Story, 12/2002)
    Technical Articles HTML
    DDS Tackles BaseStations Head On
    ... This High-Performance, Low-Power Integrated Hybrid Synthesizer Flaunts A 10-b Digital-To-Analog Converter That Operates At Up To 1 GSample/s.
    (Wireless Systems Design, September 2002)
    Technical Articles HTML
    Video Portables and Cameras Get HDMI Outputs
    By Doug Bartow, Analog Devices, Inc.
    Technical Articles HTML
    Clock Requirements For Data Converters
    (Electronic Design, 2/2005)
    Technical Articles HTML
    DDS Design
    By David Brandon, Analog Devices, Inc.
    Direct digital synthesizers are known for their highly accurate digital tuning, low noise figure, and phase-continuous frequency-hopping capabilities, which make them more attractive than alternative analog frequency-synthesis solutions.
    (EDN, 5/13/2004)
    Technical Articles HTML
    Free Direct Digital Synthesis IC Evaluation Tool
    (Control Engineering, 9/14/2006)
    Product Reviews HTML
    Analog Devices Rolls Out Multi-channel DDS Devices
    (EETimes, 7/22/3005)
    Product Reviews HTML
    Top Products of 2005
    Microwave & RF names the AD9959 and AD9958 to its Top Products list (Microwave & RF, 12/2005)
    Product Reviews HTML
    Multichannel DDS Chips Aim to Smooth Synchronization Snafus
    (EDN, 7/21/2005)
    Product Reviews HTML
    Tuning Gets Easier With Industry's First Multi-channel Direct Digital Synthesizer
    (eeProduct Center, 7/21/2005)
    Product Reviews HTML
    On-Line Evaluation Tool Simplifies Implementing DDS Semiconductors
    (eeProductCenter, 8/16/2006)
    Product Reviews HTML
    Analog Devices Introduces Two New Multichannel DDS Devices
    (Wireless Design Online, 7/22/2005)
    Product Reviews HTML
    eeProductCenter Ultimate Products
    AD9959/AD9958 selected by EE Times Editors as one of the 10 most significant products covered on eeProductCenter in the quarter (3Q05). (eeProductCenter, 1/2006)
    Product Reviews HTML
    DDS IC Initiates Synchronized Signals
    (Microwaves and RF, 7/2005)
    Product Reviews HTML
    Independently Programmable DDS Boasts Multichannel Capability
    (RFDesign, 7/21/2005)
    Product Reviews HTML
    RF Source Booklet  (PDF, 4353 kB)
    RF IC Product Overview - Version P (02/2014)
    Overview PDF
    My evaluation board is not working; the software is reporting a USB Communication Error. I verified that the evaluation board is connected to the PC and powered. What else can I check? FAQs/RAQs HTML
    Are there any specific recommendations for material in the vias of the circuit board for the thermally enhanced package styles in which some ADI DDS' are available? FAQs/RAQs HTML
    I have limited experience working with thermally enhanced packages. Where can I get information concerning the proper techniques for soldering and assembly? FAQs/RAQs HTML
    I need to operate my DDS part above the rated temperature range. Can you give me any reliability data? FAQs/RAQs HTML
    Are any of your DDS products space qualified? FAQs/RAQs HTML
    Why did the model numbers change on the AD9852 and AD9854 products? I thought they were available in the ASQ package. FAQs/RAQs HTML
    If the port has a differential REF CLK, and I want to use a single-ended clock, what do I do with the other differential input? FAQs/RAQs HTML
    If I violate the proper logic level of the REF CLK (that is, underdrive or overdrive it), what can I expect? FAQs/RAQs HTML
    What type of signal source is recommended? FAQs/RAQs HTML
    Why does spectral performance degrade when using larger values of multiplication on the clock multiplier? FAQs/RAQs HTML
    Can the DDS evaluation boards be integrated directly into a system project? FAQs/RAQs HTML
    I am having problems getting my evaluation software to see my evaluation board; what should I do to correct the problem? FAQs/RAQs HTML
    Is all DDS software supplied by Analog Devices compatible with all WinXX versions? FAQs/RAQs HTML
    What is the proper termination for the DAC outputs for the DDS products? FAQs/RAQs HTML
    Why can't I see a signal at the output of my DDS when it is unterminated? (I'm setting everything correctly, but I'm just probing the output pins of the DDS which have nothing connected to them.) FAQs/RAQs HTML
    How can I synchronize multiple DDS parts? FAQs/RAQs HTML
    Can I gate the REF CLK on and off? FAQs/RAQs HTML
    What kind of problems can I expect from exceeding the maximum clock rate? (power dissipation, spectral problems) FAQs/RAQs HTML
    What is the effect of REF CLK jitter on the DDS? FAQs/RAQs HTML
    What are the proper logic input levels for the DDS parts? FAQs/RAQs HTML
    What are the advantages and disadvantages of serial and parallel mode? FAQs/RAQs HTML
    Can I read back data at the same rate that I can write the data to the DDS device? FAQs/RAQs HTML
    What logic families can interface with our parts? FAQs/RAQs HTML
    What is the maximum speed I can write to the part? FAQs/RAQs HTML
    I would like to update the FTW of my DDS, but only a single byte of the FTW needs to change. Can the frequency tuning word of a DDS be partially updated a byte at a time? FAQs/RAQs HTML
    What layout recommendations do you have for the power supply pins of the DDS device? FAQs/RAQs HTML
    What is the effect of increasing my supply voltage beyond the nominal recommended value? FAQs/RAQs HTML
    I have limited power to supply to the part. What can I do to reduce the power consumption of the device and thus ensure that my supply is adequate? FAQs/RAQs HTML
    Do you recommend a linear or switching power supply? FAQs/RAQs HTML
    Should I separate digital and analog ground planes on my evaluation board? FAQs/RAQs HTML
    Can I use the same power supply for AVDD and DVDD? FAQs/RAQs HTML
    What is the ratio between the analog and digital currents drawn by the DDS devices? FAQs/RAQs HTML
    I'm not using all the blocks of the AD9858. What do I do with the unused inputs of these sections? FAQs/RAQs HTML
    What causes a Quadrature Digital Upconverter (AD9856, AD9857) to go into a CIC overflow condition? FAQs/RAQs HTML
    How do I use a DDS for a clock driver? FAQs/RAQs HTML
    How do I perform amplitude modulation on the output? FAQs/RAQs HTML
    How can I control the envelope of the output? FAQs/RAQs HTML
    How do I change the phase of my output signal? FAQs/RAQs HTML
    Are frequency changes of a DDS phase coherent? FAQs/RAQs HTML
    What type of frequency sweeping is available? FAQs/RAQs HTML
    What type of automatic frequency sweeping modes does each of your DDS parts support? FAQs/RAQs HTML
    Does Analog Devices offer a list of manufacturers of oscillators for DDS devices? FAQs/RAQs HTML
    Where can I find some good background material on direct digital synthesis? FAQs/RAQs HTML
    Do you have a DDS overview? FAQs/RAQs HTML
    RAQs index Rarely Asked Questions HTML
    Glossary of EE Terms Glossary HTML

    Design Tools,Models,Drivers & Software

    Title Content Type File Type
    The purpose of this tool is to assist a user in selecting and evaluating Analog Devices, Direct Digital Synthesis (DDS) IC's. It allows a user to select a device, enter the desired operating conditions and evaluate it's general performance.
    ADIsim Design/Simulation Tools HTML
    AD9959 IBIS Models IBIS Models HTML

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    Price, packaging, availability

    AD9959 Model Options
    Model Package Pins Temp.
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    AD9959BCPZ Status: Production 56 ld LFCSP (8x8mm) 56 Ind Tray, 260 $44.20 $37.59 Y  Material Info Notify Me Purchase
    AD9959BCPZ-REEL7 Status: Production 56 ld LFCSP (8x8mm) 56 Ind Reel, 750 $44.20 $37.59 Y  Material Info Notify Me 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.

    AD9959 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    AD9959/PCBZ Status: Production Evaluation Board $400.00 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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