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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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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 Nominal Input Reference (Crystal or CLK) (kHz) Input Reference Range (MHz) Output Frequencies (MHz) Output Type Number of Outputs Number of PLLs VCXO ± ppm Spread Spectrum Output Jitter (ps) Output Skew (ps) Supply Voltage (V) Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
    MAX9476  8 0.008 35.328 LVCMOS 6 1 100 No 4 (RMS)
    83 (p-p)
    185 3.0 to 3.6 TSSOP/24 52 -40 to +85 $6.75 @ 1k
    See All Clock Generators (19)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    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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