LMX2470 - Texas Instruments

LMX2470 2.6 GHz Delta-Sigma Fractional-N PLL

The LMX2470 is a low power, high performance delta-sigma fractional-N PLL with an auxiliary integerN PLL. The device is fabricated using TI’s advanced BiCMOS process. With delta-sigma architecture, fractional spur compensation is achieved with noise shaping capability of the delta-sigma modulator and the inherent low pass filtering of the PLL loop filter. Fr.

Features

1
•2 Low In-Band Phase Noise and Low Fractional Spurs
• 12 Bit or 22 Bit Selectable Fractional Modulus
• Up to 4th Order Programmable Delta-Sigma Modulator
• Enhanced Anti-Cycle Slip Fastlock Circuitry
  – Fastlock
  – Cycle Slip Reduction
  – Integrated Timeout Counters
• Digital Lock Detect Output
• Prescalers Allow Wide Range of N Values
  – RF PLL: 16/17/20/21
  – IF PLL: 8/9 or 16/17
• Crystal Reference Frequency up to 110 MHz
• On-chip Crystal Reference Frequency Doubler.
• Phase Comparison Frequency up to 30 MHz
• Hardware and Software Power-down Control
• Ultra Low Consumption: ICC = 4.1 mA (Typ.