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Obsolete

Low Cost 27 MHz 3.3 Volt VCXO

Features

  • Ideal for set-top box applications using 13.5 MHz external pullable crystal to generate lock 27 MHz clock transport video clock
  • On-chip VCXO with guaranteed pull range of ±110 ppm minimum
  • VCXO input tuning voltage 0 to 3.3 V
  • Packaged in 8-pin SOIC (150 mil wide)
  • Available in Pb (lead) free package

Description

The IDT728 combines the functions of a VCXO (Voltage Controlled Crystal Oscillator) and PLL (Phase Locked Loop) frequency doubler onto a single chip. Used in conjunction with an external pullable quartz crystal, this monolithic integrated circuit replaces more costly hybrid (canned) VCXO devices. The IDT728 is designed primarily for data and clock recovery applications within end products such as set-top box receivers. The IDT728 exhibits a moderate VCXO gain of 110 ppm/V typical, when used with a high quality external pullable quartz crystal. The frequency of the on-chip VCXO is adjusted by an external control voltage input into pin VIN. Because VIN is a high impedance input, it can be driven directly from an PWM RC integrator circuit. Frequency output increases with VIN voltage input. The usable range of VIN is 0 to 3.3 V.
Part NumberStatusSamplesStockPackageLead Count (#)Temp. GradePb (Lead) FreeCarrier Type
728MLFObsoleteN/AOut of StockSOIC8#CYesTube
728MLFTObsoleteN/AOut of StockSOIC8#CYesReel
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    Recommended Documents (1)

  1. Datasheet
    728 Datasheet
    RECOMMENDED
    PDF 178 KB 7WDXRDKU4E7E-5-33513 May 15, 2010

    Datasheets (1)

  1. Datasheet
    728 Datasheet
    RECOMMENDED
    PDF 178 KB 7WDXRDKU4E7E-5-33513 May 15, 2010

    Application Notes & White Papers (25)

  1. Application Note
    AN-805 Recommended Ferrite Beads
    PDF 91 KB R31AN0042EU0102 Rev.1.02 Aug 11, 2025
  2. Application Note
    Termination Options for High-Speed LVCMOS Driver Clock Drivers
    PDF 187 KB R31AN0065EU0101 Rev.1.01 Nov 14, 2023
  3. Application Note
    AN-827 Application Relevance of Clock Jitter
    PDF 1.99 MB 7WDXRDKU4E7E-5-57242 Mar 01, 2022
  4. Application Note
    AN-828 Termination - LVPECL
    PDF 322 KB 7WDXRDKU4E7E-5-57262 Jul 06, 2016
  5. Application Note
    AN-841 Pullable Crystal Selection and VCXO Tuning
    PDF 334 KB 7WDXRDKU4E7E-5-57311 Sep 24, 2014
    6. View More (25)

    Product Notices (PCN, EOL, etc) (4)

  1. End Of Life Notice
    PDN# : CQ-14-06R1 Revised Product Discontinuance Notice
    PDF 407 KB 7WDXRDKU4E7E-5-57649 Sep 08, 2014
  2. End Of Life Notice
    PDN# : CQ-14-06 MANUFACTURING DISCONTINUANCE NOTICE
    PDF 192 KB 7WDXRDKU4E7E-5-57647 Sep 04, 2014
  3. Product Change Notice
    PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products
    PDF 361 KB 7WDXRDKU4E7E-5-55130 Mar 24, 2013
  4. Product Change Notice
    PCN# A-0607-06 MMT Thailand as Alternate Assembly Facility for PLCC, SOIC 150mil/300mil
    PDF 223 KB 7WDXRDKU4E7E-5-41816 Oct 07, 2006
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