Overview

The 840004 is a 4 output LVCMOS/LVTTL Synthesizer optimized to generate Ethernet reference clock frequencies and is a member of the family of high performance clock solutions from IDT. Using a 26.5625MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL1:0): 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz, and 53.125MHz. The 840004 uses IDT's 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical random rms phase jitter, easily meeting Ethernet jitter requirements. The 840004 is packaged in a small 20-pin TSSOP package.

840004 - Block Diagram
840004 - Pinout
840004 - Block Diagram
840004 - Pinout
  • Four LVCMOS/LVTTL outputs, 17Ω typical output impedance
  • Selectable crystal oscillator interface or LVCMOS single-ended input
  • Supports the following input frequencies: 212.5MHz, 159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
  • VCO range: 560MHz - 700MHz
  • RMS phase jitter @ 212.5MHz (637kHz - 10MHz):
    0.49ps typical, VDDO = 3.3V
    Phase noise:
    Offset               .   Noise Power
    100Hz ............... -88.8 dBc/Hz
    1kHz ................. -109.0 dBc/Hz
    10kHz ............... -116.1 dBc/Hz
    100kHz ............. -117.5 dBc/Hz
  • Full 3.3V or mixed 3.3V core/2.5V output supply mode
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

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
    840004AGLF
    circleObsolete
    memory
    view_in_ar
    		TSSOP 20 C Yes Tube
    840004AGLFT
    circleObsolete
    memory
    view_in_ar
    		TSSOP 20 C Yes Reel
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