Add to Signal Chain Designer

ADF4351:  Wideband Synthesizer with Integrated VCO

Product Details

Product Status:Recommended for New Designs

The ADF4351 allows implementation of fractional-N or integer-N phase-locked loop (PLL) frequency synthesizers if used with an external loop filter and external reference frequency.

The ADF4351 has an integrated voltage controlled oscillator (VCO) with a fundamental output frequency ranging from 2200 MHz to 4400 MHz. In addition, divide-by-1/2/4/8/16/32 or 64 circuits allow the user to generate RF output frequencies as low as 35 MHz. For applications that require isolation, the RF output stage can be muted. The mute function is both pin- and software-controllable. An auxiliary RF output is also available, which can be powered down if not in use.

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 and can be powered down when not in use.


  • Wireless infrastructure (W-CDMA, TD-SCDMA, WiMAX, GSM, PCS, DCS, DECT)
  • Test equipment
  • Wireless LANs, CATV equipment
  • Clock generation


  • Output frequency range: 35 MHz to 4400 MHz
  • Fractional-N synthesizer and integer-N synthesizer
  • Low phase noise VCO
  • Programmable divide-by-1/-2/-4/
    -8/-16/-32/-64 output
  • Typical rms jitter: 0.3 ps rms
  • Typical EVM at 2.1 GHz: 0.4%
  • Power supply: 3.0 V to 3.6 V
  • Logic compatibility: 1.8 V
  • Programmable dual-modulus prescaler of 4/5 or 8/9
  • Programmable output power level
  • RF output mute function
  • 3-wire serial interface
  • Analog and digital lock detect
  • Switched bandwidth fast-lock mode
  • Cycle slip reduction

Functional Block Diagram for ADF4351


Title Content Type File Type
ADF4351: Wideband Synthesizer with Integrated VCO Datasheet (Rev 0, 05/2012) (pdf, 3126 kB) Data Sheets PDF
CN0360: Frequency Selective, RMS Responding RF Detector with 90 dB Dynamic Range from 35 MHz to 4.4 GHz  (pdf, 350 kB) Circuit Note PDF
CN-0239: Broadband 6 GHz Active Mixer with a Glueless Local Oscillator Interface  (pdf, 426 kB) Circuit Note PDF
CN-0311: Broadband, Low Error Vector Magnitude (EVM) Direct Conversion Transmitter Using LO Divide-by-2 Modulator  (pdf, 148 kB) Circuit Note PDF
CN-0285: Broadband Low Error Vector Magnitude (EVM) Direct Conversion Transmitter  (pdf, 464 kB) Circuit Note PDF
Fundamentals of Frequency Synthesis, Part 1: Phased Locked Loops
The first of a two-part series on frequency synthesis, with an introduction to Phased Locked Loops. This webcast looks at the need for frequency generation, the techniques from the past present and future, and how to assess the performance of a frequency synthesis, and real world applications. Particular attention will be focused on Phase Locked Loops (PLL's) as frequency synthesizers.
Webcasts WEBCAST
Fundamentals of Frequency Synthesis, Part 2: Direct Digital Synthesis (DDS)
This month we conclude our two-part series on frequency synthesis, with an introduction to Direct Digital Synthesis. We will give a basic review of how a direct digital synthesis system works, touching on the inner workings of the DDS engine at a relatively high level. We will also discuss the tradeoffs between PLL and DDS technology as a base choice for frequency synthesis needs.
Webcasts WEBCAST
UG-521: Evaluating the CN-0285 Wideband Tx Modulator Solution  (pdf, 240 kB) User Guides PDF
UG-476: PLL Software Installation Guide  (pdf, 520 kB) User Guides PDF
UG-435: Evaluation Board for the ADF4351 Fractional-N PLL Frequency Synthesizer  (pdf, 1043 kB) User Guides PDF
ADF4350 and ADF4351 Commonly Asked Questions  (pdf, 1207 kB) FAQs/RAQs PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Design Tools,Models,Drivers & Software

Title Content Type File Type
ADI’s ADIsimRF design tool provides calculations for the most important parameters within the RF signal chain, including cascaded gain, noise figure, IP3, P1dB, and total power consumption.
ADIsim Design/Simulation Tools HTML
ADIsimPLL™- Version 3.60.10
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.
ADIsim Design/Simulation Tools HTML
ADF4350 IIO Wideband Synthesizer Linux Driver Device Drivers HTML
ADF4351 Evaluation Board Software Rev 4.3.5  (zip, 21212 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

Engineered. Tested. Ready to Integrate.
Learn More

Companion Products

Suggested Companion Products

Recommended Low-Noise Voltage Regulators for the ADF4351
  • For a fixed 3.3V, 150mA low dropout regulator, we recommend the ADP150.
  • For a fixed 3.3V, 200mA low dropout regulator, we recommend the ADP151.
Recommended Fanout Buffers for the ADF4351
  • For eight differential LVPECL outputs, we recommend the ADCLK948.
Recommended Power Solutions
  • For selecting voltage regulator products, use ADIsimPower.

Were these recommendations helpful?

SampleSample & Buy

Price, packaging, availability

ADF4351 Model Options
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.

ADF4351 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-ADF4351EB1Z Status: Production Evaluation Board $175.00 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.

Check Inventory & Purchase

View Sales and Distribution Offices

content here.
content here.

Review this Product