GENERAL DESCRIPTION
The ADF4153 is a fractional-N frequency synthesizer that implements local oscillators in the upconversion and downconversion 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).

FEATURES
   RF bandwidth 500 MHz to 4 GHz
   2.7 V to 3.3 V power supply
   Separate VP allows extended tuning voltage
   Programmable dual-modulus prescaler 4/5, 8/9
   Programmable charge pump currents
   3-wire serial interface
   Analog and digital lock detect
   Power-down mode
   Pin compatible with the
      ADF4110/ADF4111/ADF4112/ADF4113 and ADF4106
   Programmable modulus on fractional-N synthesizer
   Trade-off noise versus spurious performance

APPLICATIONS
   CATV equipment
   Base stations for mobile radio (GSM, PCS, DCS,
      CDMA, WCDMA)
   Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA)
   Wireless LANs
   Communications test equipment