Overview

Description

 

The IDT8T49N244I is a dual PLL using FemtoClock® NG technology. It integrates low phase noise Frequency Translation / Synthesis and Jitter attenuation. It includes alarm and monitoring functions suitable for networking and communications applications. The device has two fully independent PLLs. Each PLL is able to generate any output frequency in the 0.98MHz - 312.5MHz range and most output frequencies in the 312.5MHz - 1,300MHz range (see Table 3 for details). A wide range of input reference clocks may be used as the source for the output frequencies.

Each PLL has three operating modes to support a very broad spectrum of applications: Frequency Synthesizer, High-Bandwidth Frequency Translator and Low-Bandwidth Frequency Translator.

Features

  • Fourth generation FemtoClock® NG technology
  • Two fully independent PLLs
  • Outputs are programmable as LVPECL or LVDS
  • Programmable output frequency: 0.98MHz up to 1,300MHz
  • Two differential inputs support the following input levels: LVPECL, LVDS, LVHSTL, HCSL
  • Input frequency range: 8kHz - 710MHz 
  • Input clock monitor and alarm
  • Smoothed reference switch
  • I2C Serial interface for register programming
  • RMS phase jitter: 486fs (typical), Low Bandwidth Mode (FracN)
  • RMS phase jitter: 326fs (typical), Synthesizer Mode (Integer FB)
  • Full 2.5V ± 5% supply mode
  • -40°C to 85°C ambient operating temperature
  • 10mm X 10mm CABGA lead-free (RoHS 6) package
  • Additional family members include Tri-PLL (8T49N366I) and Quad PLL (8T49N445I and 8T49N488I) devices

Comparison

Applications

Documentation

Design & Development

Models