New PLL synthesizer facilitates integration, flexibility, performance and continuous frequency range support

The latest member of ADI’s RF IC product portfolio, the ADF4351 PLL allows implementation of fractional-N or integer-N operation continuously over an ultra-wide frequency range of 35 MHz to 4400 MHz while maintaining excellent phase-noise performance. This has the benefit of allowing customers to greatly reduce the need to support multiple narrowband synthesizers, thereby reducing inventory and bill of materials costs. The ADF4351 incorporates a high-performance, on-chip VCO (voltage-controlled oscillator) and supports dual output ports, which allows the part to have unsurpassed flexibility and performance in a small surface-mount package.

The ADF4351 PLL features programmable divide-by-1/2/4/8/16/32/64 circuits, which allow the user to generate an RF output frequency anywhere between 35 MHz and 4400 MHz. This means that engineers no longer have to design multiple synthesizers for different bands, which speeds design cycle times and reduces component costs. For applications that require isolation, the RF output stage can be muted. The mute function is both pin- and software-controllable. Furthermore, control of all of the on-chip registers is through a simple 3-wire interface. The ADF4351 PLL operates with a power supply ranging from 3.0 V to 3.6 V and can be powered down when not in use.
ADF4351 PLL with Integrated VCO; Key Features:

* Leading RF performance: rms jitter of 0.3 ps typ; typical EVM of 0.4% at 2.1 GHz

* Ultimate Flexibility: programmable dual-modulus prescaler of 4/5 or 8/9; programmable output power level, dual output ports, integer-N or fractional-N operation

* Ultimate Flexibility: programmable dual-modulus prescaler of 4/5 or 8/9; programmable output power level, dual output ports, integer-N or fractional-N operation

* Switched bandwidth fast-lock mode

* Cycle slip reduction