PLL/VCO Solution Serves Next-Gen RF and Microwave Needs

Analog Devices has announced a synthesizer consisting of a phase-locked loop (PLL) with fully integrated voltage controlled oscillator (VCO) as well as integrated low dropout regulators (LDOs) and integrated tracking filter technology. The new ADF4371 supports RF/microwave system designs that must meet the most exacting next-generation requirements across multiple markets, including aerospace and defense, test/measurement, communications infrastructure, as well as high-speed converter clocking.

According to ADI, the ADF4371 is the highest frequency synthesizer on the market today and offers the widest continuous RF output range of 62 MHz to 32 GHz. Together with ultra-low PLL FOM (-234 dBc/Hz), ultra-low spurious (-100 dBc typ.), low VCO phase noise (-134 dBc/Hz at1 MHz offset at 8GHz), and with built-in tracking filter technology, this device leads the way for performance and adaptability. Its feature-rich, highly configurable architecture means that designers can now choose a single, ultra-compact, synthesizer solution to cover almost any LO/clock requirement within these frequency ranges, thereby reducing development costs, risk and time to market.

The ADF4371 facilitates implementation of high resolution (39-bit) fractional-N or integer-N PLL frequency synthesizers when used with an external loop filter and an external reference source. The wideband microwave VCO design allows frequencies from 62.5 MHz to 32 GHz to be generated. The device features the industry’s lowest jitter (36 fs at 10 GHz) and reference spurious (-100 dBc typ.), together with operation to 105°C without loss of lock.

For applications requiring very small compact footprints, the ADF4371 supports integrated power supply decoupling, integrated LDOs and integrated harmonic tracking filters. The tracking filter technology facilitates at least 30dB harmonic and sub-harmonic rejection across the entire VCO range. This hugely reduces the total solution footprint, particularly in the case where fixed range filters are required to meet these rejections across octave bandwidths. For applications that do not require the full frequency range capability of the ADF4371 (up to 32 GHz), ADI also offers the ADF4372 with operation up to 16 GHz.

The ADF4371 and ADF4372 are supported within ADI’s popular ADIsimPLL™ circuit design and evaluation tool that assists users in evaluating, designing and troubleshooting RF and microwave systems.

Analog Devices | www.analog.com

13.6 GHz, Next-Generation Wideband Synthesizer

Analog Devices has launched the ADF5356, which is a 13.6 GHz next-generation wideband synthesizer with an integrated voltage-controlled oscillator (VCO). The ADF5356 is well-suited for a variety of applications, including wireless infrastructure, microwave point-to-point links, electronic test and measurement, and satellite terminals. The ADF4356 is a complementary synthesizer product that operates to 6.8 GHz and is comparable in performance.

Analog-ADF5356

The ADF5356’s and ADF4356’s features, specs, and benefits:

  • Generate RF outputs from 53.125 MHz to 13.6 GHz without gaps in frequency coverage
  • Offer superior PLL figures of merit (FOM), ultra-low VCO phase noise, very low integer-boundary and phase-detector spurs, and high phase-comparison frequency.
  • Feature VCO phase noise (–113 dBc/Hz at 100 kHz offset at 5 GHz) with integrated RMS 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 the phase detector comparison frequency can be as high as 125 MHz.
  • Fully supported by the ADIsimPLL, which is Analog Devices’s easy-to-use PLL synthesizer design and simulation tool. The synthesizers are pin-compatible with Analog Devices’s existing ADF5355 and ADF4355 devices.
  • Specified over the –40°C to 85°C range
  • Operate from nominal 3.3-V analog and digital power supplies as well as 5-V charge-pump and VCO supplies
  • Features 1.8-V logic-level compatibility

The ADF5356 costs $39.98 in 1,000-unit quantities. The ADF4356 costs $20.36 in 1,000-piece quantities. The EV-ADF5356SD1Z pre-release boards cost $450 each.

Analog Devices | www.analog.com