●Description
●The LMX2541 device is an ultra low-noise frequency synthesizer which integrates a high-performance delta-sigma fractional N PLL, a VCO with fully integrated tank circuit, and an optional frequency divider. The PLL offers an unprecedented normalized noise floor of –225 dBc/Hz and can be operated with up to 104 MHz of phase-detector rate (comparison frequency) in both integer and fractional modes. The PLL can also be configured to work with an external VCO.
●Features
●• Multiple Frequency Options Available (See Device Comparison Table)
●• Frequencies From 31.6 MHz to 4000 MHz
●• Very Low RMS Noise and Spurs
●• –225 dBc/Hz Normalized PLL Phase Noise
●• Integrated RMS Noise (100 Hz to 20 MHz)
●– 2 mRad (100 Hz to 20 MHz) at 2.1 GHz
●– 3.5 mRad (100 Hz to 20 MHz) at 3.5 GHz
●• Ultra Low-Noise Integrated VCO
●• External VCO Option (Internal VCO Bypassed)
●• VCO Frequency Divider 1 to 63 (All Values)
●• Programmable Output Power
●• Up to 104-MHz Phase Detector Frequency
●• Integrated Low-Noise LDOs
●• Programmable Charge Pump Output
●• Partially Integrated Loop Filter
●• Digital Frequency Shift Keying (FSK) Modulation Pin
●• Integrated Reference Crystal Oscillator Circuit
●• Hardware and Software Power Down
●• FastLock Mode and VCO-Based Cycle Slip Reduction
●• Analog and Digital Lock Detect
●• 1.6-V Logic Compatibility
●Applications
●• Wireless Infrastructure (UMTS, LTE, WiMax)
●• Broadband Wireless
●• Wireless Meter Reading
●• Test and Measurement
●• FM Mobile Radio space
