Features and Benefits

  • 400 MSPS Internal DDS Clock Speed
  • 48-bit tuning word
  • 14-bit Programmable Phase Offset
  • Integrated 14-bit DAC Excellent Dynamic Performance
    - 80 dB SFDR @ 160 MHz
    (±100 kHz Offset IOUT
  • 25 MBit/sec-write Speed Serial I/O Control
  • 200 MHz Phase Detector Inputs
  • Programmable (1-16) phase detector 650 MHz pre-scalars (÷M, ÷N)
  • Programmable RF Prescaler (÷R)
    {R = 2, 4, 8}
  • 8 Phase/frequency Profiles
  • 1.8 V Supply for Device Operation
  • 3.3 V Supply for I/O and Charge Pump Output
  • Software Controlled Power-down
  • 48-lead LFCSP

Product Details

The AD9956 is Analog Devices’s first AgileRF synthesizer. The device is comprised of a DDS and PLL circuitry. The DDS features a 14-bit DAC operating up to 400 MSPS and a 48-bit frequency tuning word. The PLL Circuitry includes a phase detector with scaleable 200 MHz inputs (pre-scalar inputs operate up to 650 MHz) and digital control over the charge pump current. The device also includes a 650 MHz PECL driver with programmable slew rates.The AD9956 uses advanced DDS technology, an internal high-speed, high performance D/A converter and an advance phase-detector/charge pump combination to enable the synthesis of digitally-programmable, frequency-agile analog output sinusoidal waveforms up to 2.7 GHz. The AD9956 is designed to provide fast frequency hopping and fine tuning resolution (48-bit frequency tuning word). Information is loaded into the AD9956 via a serial I/O port which has a device write speed of 25 MBit/sec. The AD9956 DDS block also supports a user defined linear sweep mode of operation.

The AD9956 is specified to operate over the extended automotive range of −40°C to +125°C.


  • Agile L.O. frequency synthesis
  • FM chirp source for radar and scanning systems
  • Automotive radars
  • Test and measurement equipment
  • Acousto-optic device drivers

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)


Application Notes (21)

Frequently Asked Questions (1)

Tools & Simulations

IBIS Models

AD9956 IBIS Models

Design Tools

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.

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.

PCN-PDN Information

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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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Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.