by Christina Nickolas
Today at EMW2012 Analog Devices announced the release of the ADF4153A PLL synthesizer that offers leading phase noise performance of -223 dBc/Hz. It is an upgrade to the widely used 4-GHz ADF4153 fractional-N PLL and it is used in a variety of applications including communications infrastructure, pulse-Doppler and FMCW (frequency-modulated continuous-wave) radar applications, test and instrumentation equipment, microwave point-to-point systems, PMR (professional mobile radio), VSATs (very small aperture terminals) and aerospace systems. It is being showcased at booth 221.
With an RF bandwidth of 4 GHz, the device consists of a low-noise digital phase frequency detector (PFD), a precision charge pump, a sigma-delta fractional-N divider and a programmable reference divider. When used together with an external VCO, the ADF4153A can phase lock signals up to 4 GHz and can greatly improve the system integrated phase noise compared to the ADF4153, without requiring any significant board revisions. The ADF4153A displays market leading phase noise figure of merit (FOM) and PLL 1/f noise performance for a sub-100 mW part.
PLL 1/f noise is -121dBc/Hz at 10kHz offset normalized to 1 GHz RF (7 dB improvement over the ADF4153). In addition, a separate charge pump supply allows extended tuning voltage (up to 5 V) in 3 V systems. Housed in a 20-lead LFCSP the part is available ea/10,000 at $1.81.