Features and Benefits

  • 400 MSPS internal clock speed
  • Integrated 14-bit digital-to-analog converter (DAC)
  • 32-bit tuning word
  • Phase noise ≤ −120 dBc/Hz at 1 kHz offset (DAC output)
  • Excellent dynamic performance
    >80 dB SFDR at 160 MHz (±100 kHz offset) AOUT
  • Serial input/output (I/O) control
  • 1.8 V power supply
  • Software and hardware controlled power down
  • 48-lead TQFP/EP package
  • Phase-locked loop (PLL) REFCLK multiplier (4× to 20×)
  • Internal oscillator; can be driven by a single crystal
  • Phase modulation capability
  • Multichip synchronization

Product Details

The AD9951 is a direct digital synthesizer (DDS) featuring a 14-bit DAC operating up to 400 MSPS. The AD9951 uses advanced DDS technology, coupled with an internal high speed, high performance DAC to form a digitally programmable, complete high frequency synthesizer capable of generating a frequency-agile analog output sinusoidal waveform at up to 200 MHz. The AD9951 is designed to provide fast frequency hopping and fine tuning resolution (32-bit frequency tuning word). The frequency tuning and control words are loaded into the AD9951 via a serial I/O port.

The AD9951 is specified to operate over the extended industrial temperature range of −40°C to +105°C.


  • Agile local oscillator (LO) frequency synthesis
  • Programmable clock generators
  • 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.


Application Notes (18)

Frequently Asked Questions (1)

Tools & Simulations

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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