Electronic Design

Flexible PLLs Trim Phase Noise

Promising the utmost in phase noise performance, the ADF4151 and ADF4196 PLL synthesizers target designs such as basestations, pulse, and Doppler radar, to name a few. With a bandwidth of 3.5 GHz, the ADF4151 supports a fractional-N or integer-N PLL synthesizer. It integrates a digital phase frequency detector (PFD), charge pump, and a programmable reference divider. The ADF4196 is a fast-settling, 6-GHz fractional-N PLL meeting GSM/EDGE lock time requirements. Partnering with an external loop filter and VCO, the device achieves lock times of less than 5 μs. It also packs a digital PFD and a precision differential charge pump. Available now in a 32-LFCSP, price for the ADF4151 is $2.43 each/10,000.  ANALOG DEVICES, INC., Norwood, MA. (800) 426-2564.

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