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  6. AD9959


Features and Benefits

  • 4 synchronized DDS channels at 500 MSPS
  • Independent frequency/phase/amplitude control between channels
  • Matched latencies for frequency/phase/amplitude changes
  • Excellent channel-to-channel isolation (>65 dB)
  • Linear frequency/phase/amplitude sweeping capability
  • Up to 16 levels of frequency/phase/amplitude modulation (pin-selectable)
  • 4 integrated 10-bit digital-to-analog converters (DACs)
  • Individually programmable DAC full-scale currents
  • 0.12 Hz or better frequency tuning resolution
  • 14-bit phase offset resolution
  • 10-bit output amplitude scaling resolution
  • Serial I/O port interface (SPI) with enhanced data throughput
  • Software-/hardware-controlled power-down
  • Dual supply operation (1.8 V DDS core/3.3 V serial I/O)
  • Multiple device synchronization
  • Selectable 4× to 20× REFCLK multiplier (PLL)
  • Selectable REFCLK crystal oscillator
  • 56-lead LFCSP package

Product Details

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
  • Product Lifecycle icon-recommended Recommended for New Designs

    This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

    Evaluation Kits (1)

    Documentation & Resources

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  • Data Sheet (1)
  • Application Note (18)
  • User Guide (1)
  • Product Highlight (1)
  • Frequently Asked Question (1)
  • Circuit Note (2)
  • Technical Article (23)
  • Webcast (2)
  • Application Note
    Frequently Asked Question
    Technical Article

    Tools & Simulations

    IBIS Model

    AD9959 IBIS Models

    Design Tool

    ADIsimDDS (Direct Digital Synthesis)

    ADIsimDDS uses mathematical equations to model and illustrate the overall performance of the selected device. ADIsimDDS calculates the required FTW, given the reference clock frequency and desired output frequency. This tool also models an estimate of the overall spectral performance, and allows the user to explore the effects of external reconstruction filters.

    Reference Designs (1)

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD9959BCPZ Material Declaration Reliability Data 56-Lead LFCSP (8mm x 8mm)
    AD9959BCPZ-REEL7 Material Declaration Reliability Data 56-Lead LFCSP (8mm x 8mm)
    Wafer Fabrication Data

    PCN-PDN Information

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    Support & Discussions

    AD9959 Discussions

    RE: AD9959 Setup
    5 week(s) ago in Direct Digital Synthesis (DDS)

    Sample & Buy

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