Analog Devices has introduced a phase-locked loop (PLL) synthesizer with an integrated voltage-controlled oscillator (VCO), enabling mobile network operators to improve the performance of cellular base stations and the quality of wireless services.
The new ADF4355 PLL with VCO synthesizer has a maximum operating frequency of 6.8GHz, which can provide a large margin for the current carrier frequency in the industry. When designing in cellular base stations, the new PLL synthesizers have higher frequencies and lower VCO phase noise, enabling wireless service providers to increase call throughput and handset coverage, and for more users per base station Provide services without paying a lot of extra costs.
The higher frequency bands of this device provide similar throughput improvements for manufacturers of point-to-point / point-to-multipoint microwave links, satellite / VSAT systems, industrial and test and measurement systems, and other wireless devices.
In frequency generation applications for wireless and industrial applications, VCO phase noise performance plays a vital role in determining the overall system performance of RF signal transmission and reception, so choosing a PLL synthesizer for the RF local oscillator (LO) is very important. important. Key system design considerations. The ADF4355 wideband PLLVCO synthesizer meets the stringent requirements of VCO phase noise for frequency generation applications. It is also available in the smallest 5mm x 5mm LFCSP package, providing alternative cost-competitive PLL devices. The combination of these features allows designers to reduce risk by ensuring the lowest possible phase noise, extending frequency coverage, reducing footprint, and expanding the operating range over the entire temperature range.
The output frequency range of the ADF4355 PLL synthesizer's integrated VCO is 3.4 to 6.8 GHz. The VCO frequency connection is divided by 1, 2, 4, 8, 16, 32, or 64 circuits. This allows designers to generate RF output frequencies as low as 54 MHz, allowing the ADF4355 to cover a continuous range from 54 to 250 MHz. No gap at 6800MHz. For applications requiring noise isolation, the RF output stage has pin and software controllable mute functions. The ADF4355 can operate in decimal N or integer N mode and provides accurate mode frequency operation with 38-bit analog-to-digital resolution, regardless of the reference input frequency.
All on-chip registers are controlled through a simple 3-wire interface. The ADF4355 uses analog and digital power supplies ranging from 3.15V to 3.45V. The charge pump and VCO supply voltage range is 4.75 to 5.25V. The ADF4355 also provides hardware and software power-down modes.
