Fractional-N/Integer-N PLL Synthesizer

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Product Details

The ADF4151 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers if used with an external voltage controlled oscillator (VCO), loop filter, and external reference frequency.

The ADF4151 is used with external VCO parts and is footprint and software compatible with the ADF4350. The part consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a Σ-Δ based fractional interpolator to allow programmable fractional-N division. The INT, FRAC, and MOD registers define an overall N divider [N = (INT + (FRAC/MOD))]. The RF output phase is programmable for applications that require a particular phase relationship between the output and the reference. The ADF4151 also features cycle slip reduction circuitry, leading to faster lock times without the need for modifications to the loop filter.

Control of all the on-chip registers is through a simple 3-wire interface. The device operates with a power supply ranging from 3.0 V to 3.6 V that can be powered down when not in use.

The ADF4151 is available in a 5 mm × 5 mm package.


  • Wireless infrastructure (W-CDMA, TD-SCDMA, WiMax,
  • Test equipment
  • Wireless LANs, CATV equipment
  • Clock generation

Product Lifecycle

checked 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


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Product Details

This page contains ordering information for the evaluation board used to evaluate the ADF4151 Fractional-N/Integer-N PLL Synthesizer.

Software & Systems Requirements


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Product Recommendations

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ADF4151 Companion parts

Recommended Linear Regulators

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

Recommended PLL Active Filter

  • For an ultralow noise, rail-to-rail amplifier , we recommend the OP184 .

Recommended RF Mixers

  • For 10 MHz to 6 GHz, high dynamic range active mixers , we recommend the ADL5801 or the ADL5802 .

Design Resources

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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.

ADF4151 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints



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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.
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.