The IDT8T49N488I is a quad PLL with FemtoClock® NG technology, integrating low phase noise Frequency Translator / Synthesizer, Jitter attenuator, and alarm and monitoring functions suitable for networking and communications applications. The device has four 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. A wide range of input reference clocks and operation reference clock may be used as the source for the output frequency. 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.

To see other devices in this product family, visit the Universal Frequency Translators page.


  • Fourth generation FemtoClock® NG technology
  • Four 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: 465fs (typical), Low Bandwidth Mode (FracN)
  • RMS phase jitter: 333fs (typical), Synthesizer Mode (Integer FB)
  • Full 2.5V ± 5% supply mode
  • -40°C to 85°C ambient operating temperature
  • 10mm × 10mm CABGA lead-free (RoHS 6) package
  • Additional family members include Dual-PLL (8T49N244I), Tri-PLL (8T49N366I) and Quad PLL (8T49N445I) devices

Product Options

下单器件 ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
8T49N488A-000ASGI Active ASG80 CABGA 80 I Yes Tray
8T49N488A-000ASGI8 Active ASG80 CABGA 80 I Yes Reel
8T49N488A-999ASGI Active ASG80 CABGA 80 I Yes Tray
8T49N488A-999ASGI8 Active ASG80 CABGA 80 I Yes Reel


文档标题 他の言語 文档类型 文档格式 文件大小
8T49N488 Datasheet Datasheet PDF 1.08 MB
FemtoNG Universal Frequency Translator Ordering Product Information Guide Manual - User Reference PDF 447 KB
应用指南 &白皮书
AN-828 Termination - LVPECL Application Note PDF 229 KB
AN-831 The Crystal Load curve Application Note PDF 308 KB
AN-846 Termination - LVDS Application Note PDF 50 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-839 RMS Phase Jitter Application Note PDF 149 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
AN-801 Crystal-High Drive Level Application Note PDF 109 KB
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB
PCN# : W1308-01 Change of Passivation Thickness Product Change Notice PDF 941 KB
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB
IDT Jitter Attenuator Product Overview ( 简体中文) English Overview PDF 1.95 MB