LMX2541SQ3740E Datasheet PDF - TI

●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