The ADF41513 is an ultra-low noise frequency synthesizer that operates from 1 to 26.5 GHz. It can be used to implement local oscillators (LOs) as high as 26.5 GHz in the upconversion and downconversion sections of wireless receivers and transmitters. The synthesizer has a phase noise floor of -235 dBc/Hz. The phase frequency detector (PFD) operates up to 250 MHz (integer N mode)/125 MHz (fractional-N mode) for improved phase noise and spur performance. The ADF41513 can be used as an integer N phase-locked loop (PLL), or it can be used as a fractional-N PLL with either a fixed modulus for sub-hertz frequency resolution or variable modulus for sub--hertz exact frequency resolution.
A complete PLL is implemented when the synthesizer is used with an external loop filter and voltage controlled oscillator (VCO). The 26.5 GHz bandwidth eliminates the need for a frequency doubler or divider stage, simplifying system architecture and reducing cost. It is available in a compact, 24-lead, 4 x 4 mm LFCSP package and is ideal for wireless infrastructure, VSAT radios, aerospace and defense applications.
