FemtoClock® Crystal-to-LVDS Frequency Synthesizer

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

The 844003I-04 is a 3 differential output LVDS Synthesizer designed to generate Ethernet reference clock frequencies. Using a 19.44MHz, 20MHz or 25MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the settings of four frequency select pins (DIV_SELA[1:0], DIV_SELB[1:0]): 625MHz, 622.08MHz, 312.5MHz, 250MHz, 156.25MHz, 125MHz and 100MHz. The 844003I-04 has two output banks, Bank A with one differential LVDS output pair and Bank B with two differential LVDS output pairs. The two banks have their own dedicated frequency select pins and can be independently set for the frequencies mentioned above. The 844003I-04 uses IDT's 3RD generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Ethernet jitter requirements. The 844003I-04 is packaged in a 32-pin VFQFN package.

Features

  • Three LVDS outputs on two banks, Bank A with one LVDS pair and Bank B with 2 LVDS output pairs
  • Using a 19.44MHz, 20MHz, or 25MHz crystal, the two output banks can be independently set for 625MHz, 622.08MHz, 312.5MHz, 250MHz, 156.25MHz, 125MHz or 100MHz
  • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input
  • VCO range: 490MHz to 680MHz
  • RMS phase jitter at 125MHz (1.875MHz – 20MHz): 0.50ps (typical)
  • Full 3.3V output supply mode
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
844003AKI-04LF Obsolete NLG32P1 VFQFPN 32 I Yes Tray Availability
844003AKI-04LFT Obsolete NLG32P1 VFQFPN 32 I Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
844003I-04 Datasheet Datasheet PDF 313 KB Jan 9, 2017
Errata# NEN-11-02 Datasheet Errata PDF 219 KB Mar 22, 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-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-15-05 Market Declined Quarterly PDN Product Discontinuation Notice PDF 623 KB Oct 28, 2015
PCN# : A1509-03 Gold to Copper wire Product Change Notice PDF 31 KB Oct 14, 2015
Other
The IDT Communications Products Advantage Overview PDF 4.00 MB Mar 21, 2018
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