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 to 4 GHz
   2.7 V to 3.3 V power supply
   Separate VP allows extended tuning voltage
   Y version available: −40°C to +125°C
   Programmable fractional modulus
   Programmable charge pump currents
   3-wire serial interface
   Analog and digital lock detect
   Power-down mode
   Pin-compatible with ADF4110/ADF4111/ADF4112/ADF4113
      and ADF4106
   Consistent RF output phase
   Loop filter design possible with ADIsimPLL
   Qualified for automotive applications

APPLICATIONS
   CATV equipment
   Base stations for mobile radio (GSM, PCS, DCS, WiMAX,
      SuperCell 3G, CDMA, W-CDMA)
   Wireless handsets (GSM, PCS, DCS, CDMA, W-CDMA)
   Wireless LANs, PMR
   Communications test equipment