Product Details
●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.
●Applications
● Satellite communications terminals, radar equipment
● Instrumentation equipment
● Personal mobile radio (PMR)
● Base stations for mobile radio
● Wireless handsets
●### Features and Benefits
● 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
