ADF5356 and ADF4356 wideband RF synthesizers save board space

Analog Devices has released a 13.6GHz, wideband synthesizer, with integrated voltage-controlled oscillator (VCO). The ADF5356 targets applications such as wireless infrastructure, microwave point-to-point links, electronic test and measurement, and satellite terminals. Analog Device also offers a complementary synthesizer, the ADF4356, which operates at 6.8GHz.

The ADF5356 generates RF outputs from 53.125MHz to 13.6GHz without any gaps in frequency coverage, says Analog Devices. This allows the device to be used as a multi-band synthesizer, and eliminate the need for multiple band-specific VCOs or synthesizer products, reduce component count, board space, and power.

The wideband range is achieved without compromising performance, insists Analog Devices, since the ADF5356 offers superior phase locked loop (PLL) figures of merit (FOM), low VCO phase noise, very low integer-boundary and phase-detector spurs, and high phase-comparison frequency.

The ADF5356 and ADF4356 are based on Analog Devices’ proprietary advanced silicon-germanium (SiGe) BiCMOS process. Both are claimed to offer industry leading VCO phase noise (-113dBc/Hz at 100kHz offset at 5GHz) with integrated root mean square (RMS) jitter of just 97fsec (1kHz to 20MHz) and integer-channel noise floor of -227dBc/Hz. The phase detector spurious levels are below -85dBc typical, and the phase detector comparison frequency can be as high as 125MHz.

Both RF synthesizers are easy to design-in, says Analog Devices, and supported by the ADIsimPLL, Analog Devices’ comprehensive, easy-to-use PLL synthesizer 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 3.3V analogue and digital power supplies as well as 5V charge-pump and VCO supplies, and feature 1.8-V logic-level compatibility.

The ADF5356 is sampling now and the ADF4356 is in full production. Both are in a 32-lead, 5.0 x 5.0mm LFCSP. An evaluation board, the EV-ADF5356SD1Z, is also available.


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