Overview

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.

844003 - Block Diagram
844003 - Pin Assignment
844003 - Block Diagram
844003 - Pin Assignment
  • 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

Documentation

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    844003AGLF
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Tube
    844003AGLFT
    circleObsolete
    memory
    view_in_ar
    		TSSOP 24 C Yes Reel
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