ADF4154BRUZ-RL7

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1. DESCRIPTION

The ADF4154BRUZ-RL7 is a fractional-N frequency synthesizer that implements local oscillators in the up conversion and down conversion sections of wireless receivers and transmitters. 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, FRAC, and MOD registers define an overall N-divider (N = (INT + (FRAC/MOD))). In addition, the 4-bit reference counter (R-counter) allows selectable REFIN frequencies at the PFD input. A complete phase-locked loop (PLL) can be implemented if the synthesizer is used with an external loop filter and a voltage-controlled oscillator (VCO). A key feature of the ADF4154BRUZ-RL7 is the fast-lock mode with a builtin timer. The user can program a predetermined countdown time value so that the PLL remains in wide bandwidth mode, instead of the user having to control this time externally. 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. 

2. FEATURES

    1. RF bandwidth to 4 GHz

    2. 2.7 V to 3.3 V power supply

    3. Separate VP allows extended tuning voltage

    4. Programmable dual-modulus prescaler 4/5, 8/9

    5. Programmable charge pump currents

    6. 3-wire serial interface

    7. Digital lock detect

    8. Power-down mode

    9. Pin compatible with the ADF4110/ADF4111/ ADF4112/ADF4113, ADF4106, ADF4153

  10. Programmable modulus on fractional-N synthesizer

  11. Trade-off noise vs. spurious performance

  12. Fast-lock mode with built-in timer

  13. Loop filter design possible with ADIsimPLL™

3. APPLICATIONS

    1. Base stations for mobile radio (WiMAX, PHS, GSM, PCS, DCS, CDMA, PMR, W-CDMA, supercell 3G)

    2. Wireless handsets (PMR, GSM, PCS, DCS, CDMA, WCDMA)

    3. CATV equipment

    4. Wireless LANs

    5. Communications test equipment