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844003 - Block Diagram
844003 - Pin Assignment

844003

FemtoClock® Crystal-to-3.3V LVDS Frequency Synthesizer

The 844003 is a three differential output LVDS Synthesizer designed to generate Ethernet reference clock frequencies. Using a 31.25MHz or 26.041666MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the settings of four frequency select pins (DIV_SEL[A1:A0], DIV_SEL[B1:B0]): 625MHz, 312.5MHz, 156.25MHz, and 125MHz. The 844003 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 844003 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 844003 is packaged in a small 24-pin TSSOP package.

Features

  • Three LVDS outputs on two banks, A Bank with one LVDS pair and B Bank with two LVDS output pairs
  • Using a 31.25MHz or 26.041666MHz crystal, the two output
    banks can be independently set for 625MHz, 312.5MHz,
    156.25MHz or 125MHz
  • Selectable crystal oscillator interface or LVCMOS/LVTTL
    single-ended input
  • VCO range: 560MHz to 700MHz
  • RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz): 0.63ps (typical)
  • 3.3V output supply mode
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) packaging

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
844003AGLFActivePGG24TSSOP24CYesTubeCheck Availability
844003AGLFTActivePGG24TSSOP24CYesReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Apps Notes & White Papers
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AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
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AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
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AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
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AN-846 Termination - LVDS Application Note PDF 50 KB May 13, 2014
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AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
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AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 8, 2014
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AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
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AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
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AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
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AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
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AN-837 Overdriving the Crystal Interface Application Note PDF 50 KB May 6, 2014
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AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
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AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
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AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 2014
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AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
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AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
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AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
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AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
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AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
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AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
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AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
PCNs & PDNs
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PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Apr 14, 2016
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PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB Feb 15, 2016
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PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 28, 2016
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PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
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PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
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PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
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PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013