ADF4108S:  Aerospace PLL Frequency Synthesizer

Product Details

Product Status:Recommended for New Designs

The ADF4108 frequency synthesizer can be used to implement local oscillators in the up-conversion and down-conversion sections of wireless receivers and transmitters. It consists of a low-noise digital PFD (phase frequency detector), a precision charge pump, a programmable reference divider, programmable A and B counters, and a dual-modulus prescaler (P/P + 1). The A (6-bit) and B (13-bit) counters, in conjunction with the dual-modulus prescaler (P/P + 1), implement an N divider (N = BP + A). In addition, the 14-bit reference counter (R counter), allows selectable REFIN frequencies at the PFD input. A complete PLL (phase-locked loop) can be implemented if the synthesizer is used with an external loop filter and VCO (voltage controlled oscillator). Its very high bandwidth (7GHz) means that frequency doublers or prescalers can be eliminated in many high frequency systems, simplifying system architecture and reducing cost.


  • Broadband wireless access
  • Satellite systems
  • Instrumentation
  • Wireless LANs
  • Base stations for wireless radio


  • 7.0 GHz bandwidth
  • 3.2 V to 3.6 V power supply
  • Separate charge pump supply (VP) allows extended tuning voltage in 3.3 V systems
  • Programmable, dual-modulus prescaler 8/9, 16/17, 32/33, or 64/65
  • Programmable charge pump currents
  • Programmable antibacklash pulse width
  • 3-wire serial interface
  • Analog and digital lock detect
  • Hardware and software power-down mode
  • Loop filter design possible with ADIsimPLL

Functional Block Diagram for ADF4108

Evaluation Kits & Symbols & Footprints

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Price, packaging, availability

ADF4108S Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
5962L1420401VXA Status: Production CER. FLATPACK WITH LEADS 16 Ind Tube - - N  Material Info Notify Me Contact ADI
5962L1420402VXA Status: Production CER. FLATPACK WITH LEADS 16 Ind Tube - - N  Material Info Notify Me Contact ADI
ADF4108L703F Status: Production CER. FLATPACK WITH LEADS 16 Ind Tube - - N  Material Info PCN Contact ADI
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.

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