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24 to 36 MHz 3.3 Volt VCXO

The MK3727D 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 MK3727D is designed primarily for data and clock recovery applications within end products such as ADSL modems, set-top box receivers, and telecom systems. 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 V.


  • 24 to 36 MHz output frequency range (output frequency = 2x crystal frequency)
  • Uses an inexpensive 12 to 18 MHz external crystal
  • Ideal for ADSL applications using 17.664 MHz external pullable crystal to generate locked 35.328 MHz clock physical layer clock
  • 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 ±115 ppm minimum
  • VCXO input tuning voltage 0 to 3.3 V
  • Packaged in 8-pin SOIC (150 mil wide)
  • Available in Pb-free packaging

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Inputs (#)Input TypeInput Freq (MHz)Output Voltage (V)Output Banks (#)Phase Jitter Typ RMS (ps)
1LVCMOS24.000000 - 36.0000001Crystal12.000000 - 18.0000003.31

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
MK3727DLFObsoleteDCG8SOIC8CYesTubeCheck Availability
MK3727DLFTRObsoleteDCG8SOIC8CYesReelCheck Availability
MK3727HLFObsoleteDCG8SOIC8CYesTubeCheck Availability
MK3727HLFTRObsoleteDCG8SOIC8CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
MK3727H Datasheet Datasheet PDF 176 KB May 17, 2010
MK3727D Datasheet Datasheet PDF 178 KB Mar 8, 2006
Apps Notes & White Papers
AN-841 Pullable Crystal Selection and VCXO Tuning Application Note PDF 248 KB Sep 23, 2014
AN-848 VCXO - Crystal Selection Application Note PDF 138 KB May 14, 2014
AN-849 Loop Filter Component Selection for VCXO Based PLLs Application Note PDF 132 KB May 14, 2014
show all (6)
AN-847 VCXO - Absolute Pull Range Application Note PDF 70 KB May 13, 2014
AN-800 Approved VCXO Crystals Application Note PDF 63 KB Jan 28, 2014
Using IDT's Integrated VCXO Products MAN05 Application Note PDF 69 KB Jun 6, 2012
PDN# : CQ-14-06R1 Revised Product Discontinuance Notice Product Discontinuation Notice PDF 407 KB Sep 8, 2014
PDN# : CQ-14-06 MANUFACTURING DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 192 KB Sep 4, 2014
PDN# : U-13-04R1 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 70 KB May 28, 2013
show all (6)
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
PDN# : U-13-04 PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 69 KB Mar 21, 2013
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012