RF synthesizer helps reduce system size

-May 17, 2017

Packing an integrated VCO core with four separate VCOs, the ADF5356 wideband synthesizer from Analog Devices operates to 13.6 GHz, while a companion synthesizer, the ADF4356, operates to 6.8 GHz with comparable performance. Both devices allow the implementation of fractional-N or integer-N PLL frequency synthesizers when used with an external loop filter and an external reference frequency.

The ADF5356 generates RF outputs from 53.125 MHz to 13.6 GHz without any gaps in frequency coverage. This allows the device to be used as a multiband synthesizer, eliminating the need for multiple band-specific VCO/synthesizer products and thereby reducing component count, board space, and power. It is well-suited for such applications as wireless infrastructure, microwave point-to-point links, electronic test and measurement, and satellite terminals.

Manufactured on a SiGe BiCMOS process, the ADF5356 and ADF4356 provide VCO phase noise of -113 dBc/Hz at 100 kHz offset and 5 GHz with integrated jitter of just 97 fs (1 kHz to 20 MHz) and integer-channel noise floor of -227 dBc/Hz. Phase detector spurious levels are below -85 dBc typical, and phase detector comparison frequency can be as high as 125 MHz.

The ADF5356 and ADF4356 are specified over a temperature range of -40°C to +85°C and operate from nominal 3.3 V analog and digital power supplies, as well as 5 V charge-pump and VCO supplies. Housed in 32-lead, 5×5 mm LFCSPs, the ADF5356 and ADF4356 cost $39.98 and $20.36, respectively, in lots of 1000 units.

ADF5356 product page
ADF4356 product page

Analog Devices, www.analog.com

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