The ADF4154BRUZ 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 an 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 ADF4154 is the fast-lock mode with a built-in timer. The user can program a predetermined count-down time value so that the PLL will remain in wide bandwidth mode, instead of having to control this time externally.
● 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
● Programmable modulus on fractional-N synthesizer
● Trade-off noise versus spurious performance
● Fast-lock mode with built-in timer
