8V19N407Z-24 is a fully integrated FemtoClock® NG Jitter Attenuator and Clock Synthesizer. The device is a high-performance clock solution for conditioning and frequency/phase management of wireless base station radio equipment boards and is optimized to deliver excellent phase noise performance. The device supports JESD204B subclass 0 and 1 clock implementations. The device is very flexible in programming of the output frequency and phase. A two-stage PLL architecture supports both jitter attenuation and frequency multiplication. The first stage PLL is the jitter attenuator and uses an external VCXO for best possible phase noise characteristics.The second stage PLL lock on the VCXO-PLL output signal and synthesizes the target frequency. The second-stage PLL use an internal VCO.

The device supports the clock generation of high-frequency clocks from the VCO and low-frequency system reference signals (SYSREF). The system reference signals are internally synchronized to the clock signals. Delay functions exist for achieving alignment and controlled phase delay between system reference and clock signals and to align/delay individual output signals. The input is monitored for activity. The “hold-over” is provided to handle clock input failure scenarios. Auto-lock, individually programmable output frequency dividers and phase adjustment capabilities are added for flexibility. The device is configured through a 4-wire SP serial interface and reports lock and signal loss status in internal registers and optionally via an lock detect (nINT) output. The device is packaged in a lead-free (RoHS 6) 72-lead VFQFN package. 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.

For information regarding evaluation boards and material, please contact your local IDT sales representative.


  • Core timing unit for JESD204B wireless infrastructure and ethernet clocks
  • First stage PLL uses an external VCXO for jitter attenuation
  • Second PLL stage facilitates an integrated VCO for frequency synthesis
  • 8V19N407-19: fVCO = 1900 - 2000MHz
  • 8V19N407-24: fVCO = 2400 - 2500MHz
  • Five differential configurable LVPECL, LVDS clock outputs with a variable output amplitude
  • Four differential LVDS system reference (SYSREF) signal outputs
  • Synchronization between clock and system reference signals
  • Wide input frequency range supported by 8-bit pre- and 15-bit VCXO-PLL feedback divider
  • Output clock frequencies: fVCO ÷ N
  • Three independent output clock frequency dividers N (range of ÷1 to ÷96)
  • Phase delay capabilities for alignment/delay for clock and SYSREF signals
  • Individual output phase adjustment (Clock): one-period of the selected VCO frequency in 64 steps
  • Individual output phase adjustment (SYSREF): approximately half-period of the selected VCO frequency in 8 steps
  • Internal, SPI controlled SYSREF pulse generation
  • SYSREF frequencies: fVCO ÷ NS
  • SYSREF frequency dividers NS: ÷64 to ÷2048 (10 dividers)
  • Clock input compatible with LVPECL, LVDS and LVCMOS signals
  • Dedicated power-down features for reducing power consumption
  • Input clock monitoring
  • Holdover for temporary loss of input signal scenarios
  • Support of output power-down and output disable
  • Typical clock output phase noise at 307.2MHz:
    1MHz offset: -154.6 dBc/Hz
  • Typical clock output phase noise at 156.25 MHz:
    1MHz offset: -158.4 dBc/Hz
  • RMS phase noise of 307.2 MHz clock (12kHz - 20MHz):
    81.3fs (typical)
  • RMS phase noise of 156.25 MHz clock (12kHz - 20MHz):
    83.7fs (typical)
  • Status conditions with programmable functionality for loss-of-lock and loss of reference indication
  • Lock detect (nINT) output for status change indication
  • 3.3V core and output supply mode
  • -40°C to +85°C ambient operating temperature
  • Lead-free (RoHS 6) 72-lead VFQFN package

Product Options

Orderable Part ID Part Status Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete 72 I Yes Tray
Obsolete 72 I Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
8V19N407 Data Sheet Datasheet PDF 877 KB
Application Notes & White Papers
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 495 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 115 KB
AN-839 RMS Phase Jitter Application Note PDF 233 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-806 Power Supply Noise Rejection Application Note PDF 438 KB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB
Clock Distribution Overview 日本語 Overview PDF 217 KB
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Products for Radio Applications 日本語 Product Brief PDF 2.34 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
RF-Grade Clock Jitter Attenuator and Frequency Synthesizer Product Brief Product Brief PDF 847 KB