Texas Instruments has introduced a wideband frequency synthesiser with integrated low phase-noise voltage-controlled oscillator.
The device combines a low noise phase-locked loop (PLL) and a phase detector in a frequency synthesiser that outputs 50 to 3760 MHz.
Designated the LMX2581, the chip's phase detector frequency of 200MHz and PLL normalised phase noise of -229dBc/Hz provides a precision local oscillator for RF front ends.
VCO/PLL
The integrated VCOs allow the device to output frequencies from 50MHz to 3760MHz, eliminating the multiple VCO/PLL combinations typically required to support a broad range of applications.
There is also the option to bypass its internal multi-core VCO in favour of an external VCO.
The frequency synthesiser integrates a delta-sigma fractional-N PLL; a multi-core VCO with tank circuit; optional frequency divider; two differential RF output buffers that can deliver 10 dBm single-ended on each side; and several low-noise, high precision low dropout regulators (LDOs).