Texas Instruments LMX2541 Ultra-Low Noise Frequency Synthesizers
Texas Instruments LMX2541 Ultra-Low Noise PLLatinum Frequency Synthesizers integrate a high performance delta-sigma fractional N PLL, a VCO with fully integrated tank circuit, and an optional frequency divider. The LMX2541 is offered in a family of 6 devices with varying VCO frequency range from 1990MHz up to 4GHz. The integrated PLL on these devices offers an unprecedented normalized noise floor of -225 dBc/Hz and can be operated with up to 104MHz of phase-detector rate (comparison frequency) in both integer and fractional modes. The PLL can also be configured to work with an external VCO. TI LMX2541 Ultra-Low Noise Frequency Synthesizers integrate several low-noise, high precision LDOs and output driver matching network to provide higher supply noise immunity and more consistent performance,while reducing the number of external components. When combined with a high quality reference oscillator, the LMX2541 generates a very stable, ultra low noise signal.