analog devices inc. (adi), a global leader in high performance for signal-processing applications and leading provider of rf ics, announced the release of two new pll that allows utmost flexibility and phase noise performance. the adf4151 and adf4196 pll synthesizers ease design in a variety of applications, including communications infrastructure base-stations, pulse and doppler applications, test and instrumentation equipment, microwave point-to-point , pmr (professional mobile radio), vsats (very small aperture terminals) and aerospace systems.
with an rf bandwidth of 3.5 ghz, the adf4151 allows implementation of a fractional-n or integer-n pll synthesizer. 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 widely-used 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.
the adf4196 is an ultra-fast settling 6 ghz fractional-n pll that has been specifically designed to meet the gsm/edge lock time requirements for communications infrastructure and pulse doppler applications. when used in conjunction with an external loop filter and vco, the adf4196 pll can achieve lock times of less than 5 µs. it consists of a low noise, digital phase frequency detector (pfd) and a precision differential charge pump.
the adf4151 and adf4196 plls are supported by a new version of adisimpll,™ a comprehensive pll synthesizer design and simulation tool.