Clocks & Timing

Overview

The 849N202I is a highly flexible FemtoClock® NG general purpose, low phase noise Universal Frequency Translator™ / Synthesizer with alarm and monitoring functions suitable for networking and communications applications. It is able to generate any output frequency in the 0.98MHz - 312.5MHz range and most output frequencies in the 312.5MHz - 1,300MHz range (see Table 3 for details). A wide range of input reference clocks and a range of low-cost fundamental mode crystal frequencies may be used as the source for the output frequency.

The 849N202I has three operating modes to support a very broad spectrum of applications.

To see other devices in this product family, visit the Universal Frequency Translators page.

849N202I - Block Diagram
849N202I - Block Diagram
  • 4TH generation FemtoClock® NG technology
  • Universal Frequency Translator (UFT) / Frequency Synthesizer
  • Two outputs, individually programmable as LVPECL or LVDS
    Both outputs may be set to use 2.5V or 3.3V output levels
    Programmable output frequency: 0.98MHz up to 1,300MHz
  • Zero ppm frequency translation
  • Two differential inputs support the following input types:LVPECL, LVDS, LVHSTL, HCSL
  • Input frequency range: 8kHz - 710MHz
  • Crystal input frequency range: 16MHz - 40MHz
  • Two factory-set register configurations for power-up default state
    Power-up default configuration pin or register selectable
    Configurations customized via One-Time Programmable ROM
    Settings may be overwritten after power-up via I2C
    I2C Serial interface for register programming
  • RMS phase jitter at 125MHz, using a 40MHz crystal(12kHz - 20MHz): 510fs (typical), Low Bandwidth Mode (FracN)
  • RMS phase jitter at 400MHz, using a 40MHz crystal(12kHz - 40MHz): 321fs (typical), Synthesizer Mode (Integer FB)
  • Output supply voltage modes:
    VCC/VCCA/VCCO
    3.3V/3.3V/3.3V
    3.3V/3.3V/2.5V (LVPECL only)
    2.5V/2.5V/2.5V
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Documentation

Title Type Date
849N202 Datasheet
PDF1.49 MB
Datasheet
AN-805 Recommended Ferrite Beads
PDF91 KB
Application Note
AN-827 Application Relevance of Clock Jitter
PDF1.99 MB
Application Note
AN-828 Termination - LVPECL
PDF322 KB
Application Note
AN-831 The Crystal Load curve
PDF395 KB
Application Note
AN-844 Termination - AC Coupling Clock Receivers
PDF170 KB
Application Note
AN-846 Termination - LVDS
PDF133 KB
Application Note
AN-842 Thermal Considerations in Package Design and Selection
PDF495 KB
Application Note
AN-840 Jitter Specifications for Timing Signals
PDF442 KB
Application Note
AN-838 Peak-to-Peak Jitter Calculations
PDF115 KB
Application Note
AN-839 RMS Phase Jitter
PDF233 KB
Application Note
AN-832 Timing Budget and Accuracy
PDF131 KB
Application Note
AN-833 Differential Input Self Oscillation Prevention
PDF180 KB
Application Note
AN-834 Hot-Swap Recommendations
PDF153 KB
Application Note
AN-835 Differential Input with VCMR being VIH Referenced
PDF160 KB
Application Note
AN-836 Differential Input to Accept Single-ended Levels
PDF120 KB
Application Note
AN-837 Overdriving the Crystal Interface
PDF133 KB
Application Note
AN-830 Quartz Crystal Drive Level
PDF143 KB
Application Note
AN-815 Understanding Jitter Units
PDF565 KB
Application Note
AN-802 Crystal-Measuring Oscillator Negative Resistance
PDF136 KB
Application Note
AN-801 Crystal-High Drive Level
PDF202 KB
Application Note
AN-806 Power Supply Noise Rejection
PDF438 KB
Application Note
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products
PDF108 KB
Application Note
PDN# : TP-19-06 Manufacturing Discontinuance Notice
PDF1016 KB
End Of Life Notice
FemtoNG Universal Frequency Translator Ordering Product Information Guide
PDF270 KB
Manual - Hardware
IDT Clock Generation Overview
PDF1.83 MB
Overview
Timing Fabric for Communications Equipment Overview
PDF263 KB
Overview
FemtoClockNG-UniversalFrequencyTranslators
PDF1.06 MB
Product Brief
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility
PDF983 KB
Product Change Notice
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location
PDF583 KB
Product Change Notice
PCN# : W1308-01 Change of Passivation Thickness
PDF941 KB
Product Change Notice

Design & Development

Software Downloads

Title Type Date
PDN# : TP-19-06 Manufacturing Discontinuance Notice
PDF1016 KB
End Of Life Notice

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models

Models

Title Type Date
849N202I IBIS Model
ZIP211 KB
Model - IBIS

Product Options

    Processing table
    Part Number
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    849N202BKI-001LF
    block_flippedObsolete
    memory
    view_in_ar
    		VFQFPN 40 I Yes Tray
    849N202CKI-001LF
    block_flippedObsolete
    memory
    view_in_ar
    		VFQFPN 40 I Yes Tray
    849N202CKI-008LF
    block_flippedObsolete
    memory
    view_in_ar
    		VFQFPN 40 I Yes Tray
    849N202CKI-999LF
    block_flippedObsolete
    memory
    view_in_ar
    		VFQFPN 40 I Yes Tray
    Parametric Table tips

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