Overview

The IDT8T49N105I 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.
 
The IDT8T49N105I has three operating modes to support a very broad spectrum of applications:Frequency Synthesizer, High-Bandwidth Frequency Translator or Low-Bandwidth Frequency Translator. This  device provides two factory-programmed default power-up configurations burned into One-Time Programmable (OTP) memory. The configuration to be used is selected by the CONFIG pin. The two configurations are specified by the customer and are programmed by IDT during the final test phase from an on-hand stock of blank devices. The two configurations may be completely independent of one another. To implement other configurations, these power-up default settings can be overwritten after power-up using the I2C interface and the device can be completely reconfigured. However, these settings would have to be re-written next time the device powers-up.
 
To see other devices in this product family, visit the Universal Frequency Translators page.
 
8T49N105 - Block Diagram
8T49N105 - Pinout
8T49N105 - Block Diagram
8T49N105 - Pinout
  • Fourth generation FemtoClock® NG technology
  • Universal Frequency Translator (UFT) / Frequency Synthesizer
  • Single output (Q, nQ), programmable as LVPECL or LVDS
  • Zero ppm frequency translation
  • Single differential input supports 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 155.52MHz, using a 40MHz crystal LVDS Output (12kHz - 20MHz): 439fs (typical), Low Bandwidth Mode (FracN)
  • RMS phase jitter at 400MHz, using a 40MHz crystal (12kHz - 40MHz):285fs (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
  • Lead-free (RoHS 6) packaging

Documentation

Design & Development

ECAD Models

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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    8T49N105A-000NLGI
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    8T49N105A-000NLGI8
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    		VFQFPN 40 I Yes Reel
    8T49N105A-999NLGI
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    view_in_ar
    		VFQFPN 40 I Yes Tray
    8T49N105A-999NLGI8
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    memory
    view_in_ar
    		VFQFPN 40 I Yes Reel
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