Fractional-N PLL for RF/IF synthesis up to 6.39 GHz
The LTC6948IUFD-4#TRPBF is a fractional-N PLL clock/frequency synthesizer from Analog Devices, designed for RF/IF frequency generation. It accepts a clock input and delivers a clock output, with a maximum output frequency of 6.39 GHz. The fractional-N architecture allows fine frequency steps without requiring a high reference frequency, which matters when you are locking to a clean 10 MHz or 100 MHz reference in a base station or test equipment PLL chain.
The supply voltage range of 3.15V to 5.25V gives you a single-rail option at 3.3V or 5V, simplifying the power tree — no separate 1.8V rail needed for the PLL core.
The -4 variant is the highest-frequency member of the LTC6948 family, hitting 6.39 GHz versus 5.79 GHz for the -3 and 4.91 GHz for the -2.