The ADF4157BRUZ is a fractional-N Frequency Synthesizer with a 25-bit fixed modulus, allowing subhertz frequency resolution at 6GHz. It consists of a low noise digital phase frequency detector (PFD), a precision charge pump and a programmable reference divider. There is an ?-? 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 to 3.3V and can be powered down when not in use.

• 25-bit fixed modulus allows subhertz frequency resolution
• Separate VP allows extended tuning voltage
• Programmable charge pump currents
• 3-wire serial interface
• Digital lock detect
• Power-down mode

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