The LMX2582 device is a
low-noise, wideband RF PLL with integrated VCO that supports a frequency range from 20 MHz to
5.5 GHz. The device supports both
fractional-N and integer-N modes, with a 32-bit fractional divider allowing fine frequency
selection. Integrated noise of 47 fs
for 1.8-GHz output makes it an ideal
low-noise source. Combining best-in-class PLL and integrated VCO noise with integrated LDOs, this
device removes the need for multiple discrete devices in high performance systems.
The device accepts input frequencies up to 1.4 GHz, which combined with frequency
dividers and programmable low noise multiplier allows flexible frequency planning. The additional
programmable low-noise multiplier lets users mitigate the impact of integer boundary spurs. In
Fractional-N mode, the device can adjust the output phase by a 32-bit resolution. For applications
that need fast frequency changes, the device supports a fast calibration option which takes less
than 25 µs.
This performance is achieved by using single 3.3-V supply. It supports 2 flexible
differential outputs that can be configured as single-ended outputs as well. Users can choose to
program one output from the VCO and the second from the
channel divider. When not being used, each output can be muted separately.