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ADF4157:  HIGH RESOLUTION 6 GHZ FRACTIONAL-N FREQUENCY SYNTHESIZER

The ADF4157 is a 6 GHz fractional-N frequency synthesizer with a 25-bit fixed modulus, allowing subhertz frequency resolution at 6 GHz. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a Σ-Δ based fractional interpolator to allow programmable fractional-N division. The INT and FRAC values define an overall N ...More

ADF4157:  HIGH RESOLUTION 6 GHZ FRACTIONAL-N FREQUENCY SYNTHESIZER

Product Description

The ADF4157 is a 6 GHz fractional-N frequency synthesizer with a 25-bit fixed modulus, allowing subhertz frequency resolution at 6 GHz. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider. There is a Σ-Δ based fractional interpolator to allow programmable fractional-N division. The INT and FRAC values define an overall N divider, N = INT + (FRAC/225). The ADF4157 features cycle slip reduction circuitry, which leads to faster lock times without the need for modifications to the loop filter.

Control of all on-chip registers is via a simple 3-wire interface. The device operates with a power supply ranging from 2.7 V to 3.3 V and can be powered down when not in use.

Applications

  • Satellite communications terminals, radar equipment
  • Instrumentation equipment
  • Personal mobile radio (PMR)
  • Base stations for mobile radio
  • Wireless handsets

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    • RF bandwidth to 6 GHz
    • 25-bit fixed modulus allows subhertz frequency resolution
    • 2.7 V to 3.3 V power supply
    • Separate VP allows extended tuning voltage
    • Programmable charge pump currents
    • 3-wire serial interface
    • Digital lock detect
    • Power-down mode
    • Pin compatible with the following frequency synthesizers:
      ADF4110/ADF4111/ADF4112/ADF4113/
      ADF4106/ADF4153/ADF4154/ADF4156
    • Cycle slip reduction for faster lock times
    • Type: Single Fractional-N
    • Max RF Input (MHz): 6000MHz
    • Norm Phase Noise (dBc/Hz): 207dBc
    • Max REFin (MHz): 300MHz
    • Supply Current : 23mA
    • Package: 16-Lead TSSOP,20-Lead CSP

    Functional Block Diagram for ADF4157

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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.