Skip to main content
8N4DV85 - Block Diagram
8N4DV85 - Pinout


LVDS Dual-Frequency Programmable VCXO

The 8N4DV85 is a LVDS Dual-Frequency Programmable VCXO with very flexible frequency and pull-range programming capabilities. The device uses IDT's fourth generation FemtoClock® NG technology for an optimum of high clock frequency and low phase noise performance. The device accepts 2.5V or 3.3V supply and is packaged in a small, lead-free (RoHS 6) 6-lead ceramic 5mm x 7mm x 1.55mm package. The device can be factory-programmed to any two frequencies in the range of 15.476MHz to 866.67MHz and from 975MHz to 1300 MHz to the very high degree of frequency precision of 218Hz or better. The output frequency is selected by the FSEL pin. The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements. The device is a member of the high-performance clock family from IDT.


  • Fourth generation FemtoClock® NG technology
  • Programmable clock output frequency from 15.476MHz to 866.67MHz and from 975MHz to 1300MHz
  • Two factory-programmed output frequencies
  • Frequency programming resolution is 218Hz and better
  • Absolute pull range (APR) programmable from ±4.5 to ±754.5ppm
  • One 2.5V or 3.3V LVDS clock output
  • Output enable control input, LVCMOS/LVTTL compatible
  • RMS phase jitter @ 156.25MHz (12kHz - 20MHz): 0.47ps (typical)
  • 2.5V or 3.3V supply voltage
  • -40°C to 85°C ambient operating temperature
  • Lead-free (RoHS 6) 6-lead ceramic 5mm x 7mm x 1.55mm package

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Supply Voltage (V)Phase Jitter Typ RMS (ps)Freq. Stability Total (± PPM)
1LVDS975.000000 - 1300.000000, 15.476000 - 866.6700002.500.46063

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8N4DV85FC-0169CDIActiveCD6CDIP6IYesTrayCheck Availability
8N4DV85FC-0169CDI8ActiveCD6CDIP6IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
8N4DV85 Datasheet Datasheet PDF 498 KB Nov 21, 2013
User Guides & Manuals
FemtoClock NG Ceramic-Package XO and VCXO Ordering Information Manual - User Reference PDF 102 KB Nov 11, 2015
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-863 Power Filter Recommendations for SMD Oscillators Application Note PDF 108 KB Jul 2, 2014
AN-847 VCXO - Absolute Pull Range Application Note PDF 70 KB May 13, 2014
show all (10)
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCN# : W1308-01 Change of Passivation Thickness Product Change Notice PDF 941 KB Sep 11, 2013
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016