FemtoClock® NG Clock Synthesizer

NOTICE - The following device(s) are recommended alternatives:

The 849N2505I is a clock synthesizer designed for wireless infrastructure applications. The device generates a selectable 25MHz, 50MHz, 125MHz or 156.25MHz clock signal from a 10MHz input with excellent phase jitter performance. The device uses IDT's fourth generation FemtoClock® NG technology for an optimum of high clock frequency and low phase noise performance, combined with a low power consumption and high power supply noise rejection. The device supports a 3.3V voltage supply and is packaged in a small, lead-free (RoHS 6) 32-lead VFQFN package. The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements. The device is a member of the high-performance clock family from IDT.

Features

  • Fourth generation FemtoClock® Next Generation (NG) technology
  • Selectable 25MHz, 50MHz, 125MHz or 156.25MHz output clock synthesized from a 10MHz fundamental mode crystal or 10MHz differential input
  • Four selectable differential LVPECL or LVDS outputs
  • Crystal interface designed for 10MHz, 12pF parallel resonant crystal
  • RMS phase jitter (12kHz - 20MHz): 0.336ps (typical), LVPECL outputs
  • Period jitter: 2.7ps (maximum), LVPECL outputs
  • Full 3.3V supply voltage
  • Available in Lead-free (RoHS 6) package
  • -40°C to 85°C ambient operating temperature

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
849N2505AKILF Obsolete NLG32P1 VFQFPN 32 I Yes Tray Availability
849N2505AKILFT Obsolete NLG32P1 VFQFPN 32 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
ICS849N2505I DATASHEET Datasheet PDF 518 KB Jan 14, 2013
Errata# NEN-11-03 Errata PDF 62 KB Apr 14, 2011
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
AN-846 Termination - LVDS Application Note PDF 50 KB May 12, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 12, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 11, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 10, 2014
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 7, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 6, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 5, 2014
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 5, 2014
AN-837 Overdriving the Crystal Interface Application Note PDF 50 KB May 5, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 5, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 5, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 4, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 23, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 23, 2014
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 11, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 14, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 14, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 14, 2014
PCNs & PDNs
PDN# : CQ-17-04(R1) Product Discontinuance Notice Product Discontinuation Notice PDF 606 KB Nov 29, 2017
PDN# : CQ-17-04 Product Discontinuance Notice Product Discontinuation Notice PDF 599 KB Aug 24, 2017
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 27, 2016
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 12, 2015
PCN# : W1308-01 Change of Passivation Thickness Product Change Notice PDF 941 KB Sep 10, 2013
Other
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 24, 2016

Software & Tools

Title Other Languages Type Format File Size Date
ICS849N2505I IBIS Model Model - IBIS ZIP 67 KB Mar 30, 2010