Features and Benefits

  • RF bandwidth to 13 GHz
  • High and low speed FMCW ramp generation
  • 25-bit fixed modulus allows subhertz frequency resolution
  • PFD frequencies up to 110 MHz
  • Normalized phase noise floor of −224 dBc/Hz
  • FSK and PSK functions
  • Sawtooth, triangular, and parabolic waveform generation
  • Ramp superimposed with FSK
  • Ramp with 2 different sweep rates
  • Ramp delay, frequency readback, and interrupt functions
  • Programmable phase control
  • 2.7 V to 3.45 V analog power supply
  • 1.8 V digital power supply
  • Programmable charge pump currents
  • 3-wire serial interface
  • Digital lock detect
  • ESD performance: 3000 V HBM, 1000 V CDM
  • Qualified for automotive applications

Product Details

The ADF4159 is a 13 GHz, fractional-N frequency synthesizer with modulation and both fast and slow waveform generation capability. The part uses a 25-bit fixed modulus, allowing subhertz frequency resolution.

The ADF4159 consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. The Σ-Δ-based fractional interpolator allows programmable fractional-N division. The INT and FRAC registers define an overall N divider as N = INT + (FRAC/225).

The ADF4159 can be used to implement frequency shift keying (FSK) and phase shift keying (PSK) modulation. Frequency sweep modes are also available to generate various waveforms in the frequency domain, for example, sawtooth and triangular waveforms. Sweeps can be set to run automatically, or each step manually triggered by an external pulse. The ADF4159 features cycle slip reduction circuitry, which enables faster lock times without the need for modifications to the loop filter.

Control of all on-chip registers is via a simple 3-wire interface. The ADF4159 operates with an analog power supply in the range of 2.7 V to 3.45 V and a digital power supply in the range of 1.62 V to 1.98 V. The device can be powered down when not in use.


  • Communications infrastructure
  • Communications test equipment
  • Instrumentation
  • FMCW radars

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 (2)

Documentation & Resources

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  • Data Sheets (1)
  • User Guides (2)
  • Product Highlight (1)
  • Product Selection Guide (1)
  • Solutions Bulletins & Brochures (1)
  • Circuit Note (1)
  • Videos (9)
  • Press Releases (2)
  • Technical Articles (4)
  • Webcasts (2)
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    Software & Systems Requirements

    Tools & Simulations

    IBIS Models

    Design Tools


    ADIsimPLL enables the rapid and reliable evaluation of new high performance PLL products from ADI. It is the most comprehensive PLL Synthesizer design and simulation tool available today. Simulations performed include all key non-linear effects that are significant in affecting PLL performance. ADIsimPLL removes at least one iteration from the design process, thereby speeding the design- to-market.

    Reference Designs (1)

    Product Recommendations

    ADF4159 Companion Parts

    Recommended Linear Regulators

    • For ultalow noise, 3V applications, 200mA output: ADP151.
    • For high accuracy, 5V applications: ADP3334.
    • For ultralow noise, 3V applications,150mA output: ADP150.
    • For a step up, 3V to 5V regulator: ADP1613.

    Recommended PLL Active Filter

    • For an ultralow noise, rail-to-rail amplifier: OP184.
    • For an ultralow noise, rail-to-rail, high gain bandwidth amplifier: AD8065.

    Recommended Divide-by-4 Prescaler

    • For a low noise, low power, fixed RF block: ADF5001.

    Recommended Modulators/Demodulators

    Recommended RF Mixers

    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.

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