The 81006 is a high performance, low jitter/ low phase noise VCXO and is a member of the family of high performance clock solutions from IDT. The 81006 works in conjunction with a pullable crystal to generate an output clock over the range of 12MHz - 31.25MHz and has 6 LVCMOS outputs, effectively integrating a fanout buffer function.

The frequency of the VCXO is adjusted by the VC control voltage input. The output range is ±100ppm around the nominal crystal frequency. The VC control voltage range is 0 - VDD. The device is packaged in a small 4mm x 4mm VFQFN package and is ideal for use on space constrained boards typically encountered in ADSL/VDSL applications.


  • Six LVCMOS/LVTTL outputs, 20? nominal output impedance
  • Output Q5 can be selected for ÷1 or ÷2 frequency relative to the crystal frequency
  • Output frequency range: 12MHz to 31.25MHz
  • Crystal pull range: ± 90ppm (typical)
  • Synchronous output enable places outputs in High-Impedance state
  • On-chip filter on VIN to suppress noise modulation of VCXO
  • VDD/VDDO combinations 3.3V/3.3V 3.3V/2.5V 3.3V/1.8V 2.5V/2.5V 2.5V/1.8V
  • 4mm x 4mm 20 Lead VFQFN package is ideal for space constrained designs
  • 0°C to 70°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
81006AKLF Obsolete NLG20P1 VFQFPN 20 C Yes Tube
81006AKLFT Obsolete NLG20P1 VFQFPN 20 C Yes Reel

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
81006 Datasheet Datasheet PDF 394 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB
AN-841 Pullable Crystal Selection and VCXO Tuning Application Note PDF 248 KB
AN-849 Loop Filter Component Selection for VCXO Based PLLs Application Note PDF 132 KB
AN-848 VCXO - Crystal Selection Application Note PDF 138 KB
AN-845 Termination - LVCMOS Application Note PDF 62 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB
AN-847 VCXO - Absolute Pull Range Application Note PDF 70 KB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
PDN# : CQ-15-01 (R1) Quarter PDN for Declined Market Product Discontinuation Notice PDF 550 KB
PDN# : CQ-15-01 Quarter PDN for Declined Market Product Discontinuation Notice PDF 547 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
N0806-01 Datasheet Change Notice Product Change Notice PDF 16 KB
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB

Software & Tools

Title Other Languages Type Format File Size Date
81006 IBIS Model Model - IBIS ZIP 94 KB