ADF4156

Data Sheet 6.2 GHz Fractional-N Frequency Synthesizer ADF4156 FEATURES RF bandwidth to 6.2 GHz 2.7 V to 3.3 V power supply Separate VP pin allows extended tuning voltage Programmable fractional modulus Programmable charge-pump currents 3-wire serial interface Digital lock detect Power-down mode Pin compatible with ADF4110/ADF4111/ADF4112/ADF4113, ADF4106, ADF4153, and ADF4154 frequency synthesizers Programmable RF output phase Loop filter design possible with ADIsimPLL Cycle slip reduction for faster lock times APPLICATIONS CATV equipment Base stations for mobile radio (WiMAX, GSM, PCS, DCS, SuperCell 3G, CDMA, WCDMA) Wireless handsets (GSM, PCS, DCS, CDMA, WCDMA) Wireless LANs, PMR Communications test equipment GENERAL DESCRIPTION The ADF4156 is a 6.2 GHz 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))). The RF output phase is programmable for applications that require a particular phase relationship between the output and the reference. The ADF4156 also features cycle slip reduction circuitry, leading to faster lock times without the need for modifications to the l...