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 ...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

    • Features

    • 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

    Diagrams

    ADF4157 Functional Block Diagram
    ADF4157 Functional Block Diagram

    Specifications

    Type Single Fractional-N
    Max RF Input (MHz) 6000MHz
    Norm Phase Noise (dBc/Hz) 207dBc
    Max REFin (MHz) 300MHz
    Supply Current (max) 29mA
    Package 16-Lead TSSOP,20-Lead CSP

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    Part# Type Max RF Input (MHz) Output Frequency Range Norm Phase Noise (dBc/Hz) Max REFin (MHz) RF Prescalers Supply Current (max) Package Price* (1000-4999)
    AD809 Synthesizer - 155.52 MHz -219 19.44 - 17 16-Lead SOIC $3.85
    ADF4001 Single Integer-N 200 - -214 104 n/a 4.5 16-Lead TSSOP, 20-Lead CSP $1.72
    ADF4002 Single Integer-N 400 - -222 300 n/a 5 16-Lead TSSOP, 20-Lead CSP $1.97
    ADF4007 Single Integer-N 7500 - -219 240 N counter = 8/16/32/64 13 20-Lead CSP $2.16
    ADF4106 Single Integer-N 6000 - -219 300 16/17, 32/33, 64/65, 8/9 13 16-Lead TSSOP, 20-Lead CSP $2.16
    ADF4107 Single Integer-N 7000 - -219 250 16/17, 32/33, 64/65, 8/9 13 16-Lead TSSOP, 20-Lead CSP $2.67
    ADF4108 Single Integer-N 8000 - -219 250 16/17, 32/33, 4/5, 64/65, 8/9 17 20-Lead CSP $3.34
    ADF4110 Single Integer-N 550 - -215 104 16/17, 32/33, 64/65, 8/9 4.5 16-Lead TSSOP, 20-Lead CSP $2.28
    ADF4111 Single Integer-N 1200 - -215 104 16/17, 32/33, 64/65, 8/9 4.5 16-Lead TSSOP, 20-Lead CSP $2.28
    ADF4112 Single Integer-N 3000 - -215 104 16/17, 32/33, 64/65, 8/9 6.5 16-Lead TSSOP, 20-Lead CSP $2.28
    ADF4113 Single Integer-N 4000 - -215 104 16/17, 32/33, 64/65, 8/9 8.5 16-Lead TSSOP, 20-Lead CSP $2.28
    ADF4113HV Single Integer-N 4000 - -212 104 16/17, 32/33, 64/65, 8/9 11 16-Lead TSSOP, 20-Lead CSP $2.49
    ADF4116 Single Integer-N 550 - -211 100 8/9 4.5 16-Lead TSSOP $2.28
    ADF4117 Single Integer-N 1200 - -213 100 32/33 4.5 16-Lead TSSOP $2.28
    ADF4118 Single Integer-N 3000 - -216 100 32/33 6.5 16-Lead TSSOP $2.28
    ADF4153 Single Fractional-N 4000 - -213 250 4/5, 8/9 12 16-Lead TSSOP, 20-Lead CSP $2.28
    ADF4154 Single Fractional-N 4000 - -213 250 4/5, 8/9 12 16-Lead TSSOP, 20-Lead CSP $2.28
    ADF4156 Single Fractional-N 6000 - -213 250 4/5, 8/9 12 16-Lead TSSOP, 20-Lead CSP $3.04
    ADF4157 Single Fractional-N 600