Overview

Features and Benefits

  • 8.0 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
  • 4 mm × 4 mm, 20-lead chip scale package

Product Details

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 (8GHz) means that frequency doublers or prescalers can be eliminated in many high frequency systems, simplifying system architecture and reducing cost.

Applications

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

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.

Evaluation Kits (1)

Tools & Simulations

Design Tools

ADIsimRF

ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

ADIsimPLL™

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.

Product Recommendations

ADF4108 Companion Parts

Recommended Linear Regulators

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

Recommended Divide-by-4 Prescaler

  • For a low noise, low power, fixed RF block: ADF5001.

Recommended PLL Active Filter

  • For an ultralow noise, rail-to-rail amplifier: OP184.

Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.