ADF4108 8 GHz integer-N PLL

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
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
    • RF & Microwave
    Data Sheets
    Documentnote
    ADF4108: PLL Frequency Synthesizer Data Sheet (Rev. E)PDF 457 kB
    Application Notes
    Documentnote
    AN-873: Lock Detect on the ADF4xxx Family of PLL Synthesizers (Rev. 0)PDF 207 kB
    AN-30: Ask the Applications Engineer - PLL SynthesizersPDF 184 kB
    AN-349: Keys to Longer Life for CMOSPDF 89 kB
    User Guides
    Documentnote
    UG-160: Evaluation Board for Integer-N PLL Frequency SynthesizerPDF 420 kB
    UG-476: PLL Software Installation GuidePDF 520 kB
    Frequently Asked Questions
    Documentnote
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    ADF4108BCPZ Production20 ld LFCSP 4x4mm (2.1EP) OTH 490-40 to 85C3.933.34Y
    ADF4108BCPZ-RL Production20 ld LFCSP 4x4mm (2.1EP) REEL 5000-40 to 85C00Y
    ADF4108BCPZ-RL7 Production20 ld LFCSP 4x4mm (2.1EP) REEL 1500-40 to 85C03.34Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EV-ADF4108EB1ZEvaluation Board200Y
    Reference Materials
    ADF4108: PLL Frequency Synthesizer Data Sheet (Rev. E) adf4108
    AN-349: 延长CMOS寿命的关键因素 adg3233
    AN-30: 应用工程师答问—30 adf4360-1
    AN-873: ADF4xxx系列PLL频率合成器的锁定检测 (Rev. 0) ad9540
    AN-873: Lock Detect on the ADF4xxx Family of PLL Synthesizers (Rev. 0) ad9540
    AN-30: Ask the Applications Engineer - PLL Synthesizers adf4360-1
    AN-349: Keys to Longer Life for CMOS ad7703
    UG-476: PLL Software Installation Guide adf9010
    UG-476：PLL软件安装指南 adf4360-1
    UG-160: Evaluation Board for Integer-N PLL Frequency Synthesizer adf4108
    RF Source Booklet adf9010
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