ADF4155:  Integer-N / Fractional-N PLL Synthesizer

Product Details

Product Status:Recommended for New Designs

The ADF4155 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers when used with an external loop filter, external voltage controlled oscillator (VCO), and external reference frequency.

The ADF4155 is for use with external VCO parts up to an 8 GHz operating frequency. The high resolution programmable modulus allows synthesis of exact frequencies with 0 Hz error.

The VCO frequency can be divided by 1, 2, 4, 8, 16, 32, or 64 to allow the user to generate RF output frequencies as low as 7.8125 MHz.

Control of all on-chip registers is through a simple 3-wire interface. The device operates with a nominal power supply of 3.3 V ± 5% and can be powered down when not in use.

The ADF4155 is available in a 24-lead, 4 mm × 4 mm LFCSP package.


  • Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM, PCS, DCS, DECT)
  • Point to point/point to multipoint microwave links
  • Test equipment
  • Wireless LANs, CATV equipment
  • Clock generation


  • Input frequency range: 500 MHz to 8000 MHz
  • Fractional-N synthesizer and integer-N synthesizer
  • Phase frequency detector (PFD) up to 125 MHz
  • High resolution 38-bit modulus
  • Separate charge pump supply (VP) allows extended tuning voltage in 5 V systems
  • Programmable divide by 1, 2, 4, 8, 16, 32, or 64 output
  • Differential and single-ended reference inputs
  • Power supply: 3.3 V ± 5%
  • Logic compatibility: 1.8 V
  • Programmable dual-modulus prescaler (P) of 4/5 or 8/9
  • Programmable output power level
  • 3-wire serial interface
  • Analog and digital lock detect

Functional Block Diagram for ADF4155

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADF4155 Evaluation Board Software  (zip, 21257 kB) Evaluation Software ZIP

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

Product Recommendations & Reference Designs

Companion Products

Suggested Companion Products

Recommended LDO for the ADF4155
  • For low noise LDO supply, we recommend ADM7150.
Recommended Modulator
  • For 6 GHz modulator, we recommend the ADL5375.
Recommended Op Amp for the ADF4155
  • For low noise in active loop filter, we recommend the AD820.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

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Price, packaging, availability

Price Table Help

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.

ADF4155 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EV-ADF4155EB1Z Status: Production Evaluation Board $225.00 Yes -

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.

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