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843N252-45 - LVPECL Frequency Synthesizer

General Description

The 843N252-45 is a 1 LVPECL and 1 LVCMOS output Synthesizer optimized to generate Ethernet reference clock frequencies.

Key Features

  • Fourth generation FemtoClock® Next Generation (NG) technology.
  • One differential 3.3V LVPECL output and one LVCMOS/LVTTL output.
  • Crystal oscillator interface designed for a 25MHz parallel resonant crystal.
  • A 25MHz crystal generates output frequencies of: 156.25MHz and 125MHz.
  • VCO frequency: 625MHz.
  • RMS Phase Jitter @ 156.25MHz, (12kHz.
  • 20MHz) using a 25MHz crystal: 0.33ps (typical).
  • RMS Phase Jitter @ 125MHz, (12kHz.

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Datasheet Details

Part number 843N252-45
Manufacturer Renesas
File Size 483.65 KB
Description LVPECL Frequency Synthesizer
Datasheet download datasheet 843N252-45 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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FemtoClock® NG Crystal-to-3.3V LVPECL Frequency Synthesizer 843N252-45 Data Sheet General Description The 843N252-45 is a 1 LVPECL and 1 LVCMOS output Synthesizer optimized to generate Ethernet reference clock frequencies. The device uses IDT’s fourth generation FemtoClock ® NG technology for an optimum of high clock frequency and low phase noise performance, combined with a low power consumption and high power supply noise rejection. Using a 25MHz parallel resonant crystal, the following frequencies can be generated: 156.25MHz and 125MHz. With a very low phase noise VCO it is targeted to achieve 0.4ps or lower typical rms phase jitter, easily meeting Ethernet jitter requirements. The 843N252-45 is packaged in a small 16-pin TSSOP package.