ADF4157

Data Sheet High Resolution 6 GHz Fractional-N Frequency Synthesizer ADF4157 FEATURES GENERAL DESCRIPTION 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 APPLICATIONS 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. Satellite communications terminals, radar equipment Instrumentation equipment Personal mobile radio (PMR) Base stations for mobile radio Wireless handsets FUNCTIONAL BLOCK DIAGRAM AVDD DVDD VP RSET ADF4157 REFIN ...