Wideband RF synthesisers feature design and versatility

3rd May 2017
Anna Flockett

Analog Devices have announced the ADF5356, a 13.6 GHz next-generation wideband synthesiser with integrated voltage-controlled oscillator (VCO). The synthesiser targets applications such as wireless infrastructure, microwave point-to-point links, electronic test and measurement, and satellite terminals. A complimentary synthesiser product, the ADF4356, operates to 6.8GHz and is comparable in performance.

The ADF5356 generates RF outputs from 53.125MHz to 13.6GHz without any gaps in frequency coverage, which allows the device to be used as a multiband synthesiser, thus eliminating the need for multiple band-specific VCOs/synthesisers products and thereby reducing component count, board space, and power.

The wideband range is achieved without compromising performance, since the ADF5356 offers superior PLL Figures Of Merit (FOM), ultra-low VCO phase noise, very low integer-boundary and phase-detector spurs, and high phase-comparison frequency.  

Developed on ADI's proprietary advanced SiGe BiCMOS process, the ADF5356 and ADF4356 feature industry leading VCO phase noise (-113dBc/Hz at 100kHz offset at 5GHz) with integrated rms jitter of just 97fsec (1kHz to 20MHz) and integer-channel noise floor of -227dBc/Hz. The phasedetector spurious levels are below -85dBc typical, and the phase detector comparison frequency can be as high as 125MHz.

These RF synthesisers are easy to design-in, and fully supported by the ADIsimPLL, Analog Devices' comprehensive and easy to use PLL synthesiser design and simulation tool for assessing phase noise, lock time, jitter and other design considerations. To provide an upgrade path for designers, the synthesizers are pin-compatible with Analog Devices' existing ADF5355 and ADF4355 devices.

The ADF5356 and ADF4356 are specified over the -40 to 85°C range. They operate from nominal 3.3-V analogue and digital power supplies as well as 5-V charge-pump and VCO supplies, and feature 1.8-V logic-level compatibility.

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