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MAX9476
Low-Jitter, 8kHz Reference Clock Synthesizer Outputs 35.328MHz

Clock Generator is Optimized for xDSL CO Line Cards and Telecom Systems Requiring Low-Jitter Clock Outputs


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 152kB)
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The MAX9476 low-cost, high-performance clock synthesizer with an 8kHz input reference clock provides six buffered LVTTL clock outputs at 35.328MHz. The clock synthesizer can be used to generate the clocks for systems using T1, E1, T3, E3, and xDSL.

The MAX9476 features a phase-lock loop (PLL) that uses a voltage-controlled crystal oscillator (VCXO). The internal PLL phase locks the external crystal (35.328MHz) to the 8kHz input reference clock. In addition, this device generates a jitter-suppressed output that provides a better source for the reference clock relay.

The MAX9476 is available in a 24-pin TSSOP package and operates over the extended operating temperature range of -40°C to +85°C and a single +3V to +3.6V power-supply range. For using lower value external crystals, refer to the MAX9486 data sheet.

Key Features   Applications/Uses
  • 8kHz Input-Reference CLK
  • 4psRMS (typ) Output Jitter
  • High-Jitter Rejection on the Reference CLK
  • Synthesizer Locks to the 8kHz Reference with a ±100ppm Range
  • Output Frequency: 35.328MHz
  • Six Buffered LVTTL Low-Jitter Outputs
  • One 8kHz Reference CLK Relay Output
  • +3.3V Supply Operation
  • 24-Pin TSSOP Package

 
  • Telecom Equipment Using T1, E1, T3, E3, and ISDN Protocols
  • xDSL Equipment in CO with Interface to the Telecom Protocols

    Key Specifications:  Clock Generators
    Part Number Applications fIN
    (MHz)
    fIN
    (MHz)
    fOUT
    (MHz)
    fOUT
    (MHz)
    Fixed or Continuous Frequency Output Levels Out-
    puts
    PLLs Spread Spectrum Output Jitter
    (ps)
    VSUPPLY
    (V)
    Package/Pins Price
    min max min max RMS See Notes
    MAX9476 
    T1/E1
    T3/E3
    xDSL
    0.008 0.008 35.328 35.328 Fixed LVCMOS 6 1 No 4 3.3
    TSSOP/24
    $6.75 @1k
    See All Clock Generators (27)

    Diagram
    MAX9476: Typical Application Circuit
    Typical Application Circuit

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    Document Ref.: 19-3530; Rev 0; 2005-02-03
    This page last modified: 2007-07-25


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