Skip to main content
8N4QV01 - Block Diagram
8N4QV01 - Pinout
8N4QV01 - Package Outline Drawing
8N4QV01 - Block Diagram
8N4QV01 - FemtoClockNG Ceramic Package XO-VCXO-Ordering Guide


Quad-Frequency Programmable VCXO

The 8N4QV01 is a Quad-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) 10-lead ceramic 5mm x 7mm x 1.55mm package. Besides the 4 default power-up frequencies set by the FSEL0 and FSEL1 pins, the 8N4QV01 can be programmed via the I2C interface to any output clock frequency between 15.476MHz to 866.67MHz and from 975MHz to 1,300MHz to a very high degree of precision with a frequency step size of 435.9Hz ÷N (N is the PLL output divider). Since the FSEL0 and FSEL1 pins are mapped to 4 independent PLL, P, M and N divider registers (P, MINT, MFRAC and N), reprogramming those registers to other frequencies under control of FSEL0 and FSEL1 is supported. The extended temperature range supports wireless infrastructure, telecommunication and networking end equipment requirements.


  • Fourth generation FemtoClock® NG technology
  • Programmable clock output frequency from 15.476MHz to 866.67MHz and from 975MHz to 1,300MHz
  • Four power-up default frequencies (see part number order codes), re-programmable by I2C
  • I2C programming interface for the output clock frequency, APR and internal PLL control registers
  • Frequency programming resolution is 435.9Hz ÷N
  • Absolute pull-range (APR) programmable from ±4.5ppm to ±754.5ppm
  • One 2.5V or 3.3V LVDS differential clock output
  • Two control inputs for the power-up default frequency
  • LVCMOS/LVTTL compatible control inputs
  • RMS phase jitter @ 156.25MHz (12kHz - 20MHz): 0.494ps (typical)
  • RMS phase jitter @ 156.25MHz (1kHz - 40MHz): 0.594ps (typical)
  • 2.5V or 3.3V supply voltage modes
  • -40°C to 85°C ambient operating temperature
  • Available in Lead-free (RoHS 6) 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 - 866.6700002.500.475113

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8N4QV01BG-0001CDActiveCD10CLCC10CYesTrayCheck Availability
8N4QV01BG-0001CD8ActiveCD10CLCC10CYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
IDT8N4QV01 Datasheet Datasheet PDF 449 KB Mar 19, 2014
User Guides & Manuals
FemtoClock NG Ceramic-Package XO and VCXO Ordering Information Manual - User Reference PDF 102 KB Nov 11, 2015
FemtoClock NG Ceramic 5x7 Module Programming Guide Manual - User Reference PDF 333 KB Mar 2, 2012
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-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 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
IDT FemtoNG 5x7 Product Brief Product Brief PDF 6.57 MB Apr 27, 2012

News & Additional Resources

Related Videos

  • 2012-08-03 Low-jitter Clocks: 5x7 Femtoclock NG...