Features and Benefits

  • RF bandwidth to 13.5 GHz
  • High and low speed FMCW ramp generation
  • 25-bit fixed modulus allows subhertz frequency resolution
  • PFD frequencies up to 130 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
  • See datasheet for additional features

Product Details

The ADF4169 is a 13.5 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 ADF4169 consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. The .-/-based fractional interpolator allows programmable fractional-N division. The INT and FRAC registers define an overall N divider as N = INT + (FRAC/225).

The ADF4169 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 with each step manually triggered by an external pulse. The ADF4169 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 ADF4169 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 1.8 V to 2.0 V. The device can be powered down when not in use.


  • FMCW radars
  • Communications test equipment
  • Communications infrastructure

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.

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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.

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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.