LMX2531

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LMX2531 SNAS252S – OCTOBER 2005 – REVISED DECEMBER 2014 LMX2531 High-Performance Frequency Synthesizer System With Integrated VCO 1 Features 1 Multiple Frequency Options Available – See Device Information Table – Frequencies From: 553 MHz to 3132 MHz PLL Features – Fractional-N Delta-Sigma Modulator Order Programmable up to Fourth Order – FastLock/Cycle Slip Reduction with Timeout Counter – Partially Integrated, Adjustable Loop Filter – Very Low Phase Noise and Spurs VCO Features – Integrated Tank Inductor – Low Phase Noise Other Features – 2.8-V to 3.2-V Operation – Low Operating Current – Low Power-Down Current – 1.8-V MICROWIRE Support – 36-Pin 6-mm × 6-mm × 0.8-mm WQFN Package 2 Applications Cellular Base Stations Wireless LANs Broadband Wireless Access Satellite Communications Wireless Radios Automotive CATV Equipment Instrumentation and Test Equipment RFID Readers Data Converter Clocking 3 Description The LMX2531 is a low-power, high-performance frequency synthesizer system which includes a fully integrated delta-sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and adjustable. Ultra-low noise and high-precision LDOs are integrated for the PLL and VCO, which yield higher supply-noise immunity and more consistent performance. When combined with a high-quality reference oscillator, the LMX2531 device gene...