Analog Devices has introduced two new PLL synthesisers, the ADF4151 and ADF4196 PLL synthesisers intended for communications infrastructure basestations, pulse and Doppler radar applications, test and instrumentation equipment, microwave point-to-point systems, PMR (professional mobile radio), VSATs (very small aperture terminals) and aerospace systems.

With an RF bandwidth of 3.5GHz, the ADF4151 allows implementation of a Fractional-N or Integer-N PLL synthesiser.

It consists of a low noise digital phase frequency detector (PFD), a precision charge pump, and a programmable reference divider and is pin-and software-compatible with ADI’s ADF4350 4.4 GHz PLL.

When these two PLLs are used together, the ADF4151 facilitates the use of an external voltage controlled oscillator (VCO) and greatly improves phase noise without significant board revisions.

Download ADF4151 data sheet, order samples or evaluation boards:  http://www.analog.com/adf4151

Download ADF4196 data sheet, order samples or evaluation boards: http://www.analog.com/adf4196