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ADF4108:  PLL FREQUENCY SYNTHESIZER

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) ...More

ADF4108:  PLL FREQUENCY SYNTHESIZER

Product Description

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

    • Data Sheet, Rev. A, 12/07

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    • 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
    • Type: Single Integer-N
    • Max RF Input (MHz): 8000MHz
    • Norm Phase Noise (dBc/Hz): -219dBc
    • Max REFin (MHz): 250MHz
    • RF Prescalers: 16/17,32/33,4/5,64/65,8/9
    • Supply Current : 15mA
    • Package: 20-Lead CSP

    Functional Block Diagram for ADF4108

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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.
    **Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.