LMX2485 - Texas Instruments

LMX2485 3-GHz Delta-Sigma Low-Power Dual PLLatinum Frequency Synthesizer

The LMX2485 device is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integer-N PLL. The device is fabricated using Texas Instruments' advanced process. With delta-sigma architecture, fractional spurs at lower offset frequencies are pushed to higher frequencies outside the loop bandwidth. The ability to push close in spur and pha.

Features

•1 Quadruple Modulus Prescaler for Lower Divides
  – RF PLL: 8/9/12/13 or 16/17/20/21
  – IF PLL: 8/9 or 16/17
• Advanced Delta-Sigma Fractional Compensation
  – 12-Bit or 22-Bit Selectable Fractional Modulus
  – Up to 4th Order Programmable Delta-Sigma Modulator
• Features for Improved Lock Time
  – Fastlock / Cycle Slip Reduction With Integrated Time-Out Counter Which Requires Only a Single-Word Write
• Wide Operating Range
  – LMX2485 RF PLL: 500 MHz to 3.0 GHz
  – LMX2485E RF PLL: 50 MHz to 3.0 GHz
• Useful Features
  – Digital Lock Detect Output
  – Hardware and Software Power-Down Control
  – On-Chip Input .