Clock and Data Recovery (CDR)
  • GN1113
  • 8.5 Gbps Fibre Channel Rx Repeater
  • GN1114
  • 8.5 Gb/s CDR with Equalizer Input and VCSEL Driver
  • GN2003S
  • 9.95 - 11.3 Gb/s Limiting Amplifier plus Clock and Data Recovery
  • GN2004S
  • 9.95 - 11.3 Gb/s Equalizer plus Clock and Data Recovery
  • GN2010D
  • Dual 8.5G & 10G CDR with integrated DML driver and limiting amplifier
  • GN2010E
  • Dual 8.5G & 10G CDR with intergrated EML driver and limiting amplifier
  • GN2012
  • Dual 8.5G & 10G CDR with integrated limiting amplifier
  • GN2013A
  • Limiting Amplifier plus Clock and Data Recovery IC with Manual Slice Level Adjust
Semtech GN2405A

Semtech GN2405A

Quad 10Gb/s CDR with Rx Equalizer and Transmit De-Emphasis

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The GN2405A is a quad repeater/re-timer device designed to enhance the reach and robustness of high speed serial links by compensating for transmission losses and re-setting the crosstalk and jitter budget.

The GN2405A features Gennum's proven reference-free CDR architecture which simplifies system design and reduces overall cost. Each channel supports independent locking to data rates from 9.95 - 11.3Gb/s. To enable backward compatibility with legacy data rates, half rate (5Gb/s) and quarter rate (2.5Gb/s) operation is also supported. Other rates can be supported using the re-timer bypass feature.

The GN2405A can be used in multiple applications. It can be used as a CDR in parallel optical modules or in active copper cable assemblies. It’s flexible de-emphasis driver and jitter performance are ideal for use as a line card or backplane repeater.


  • Automatic locking from 9.95Gb/s to 11.3Gb/s
  • Automatic rate detect for quarter rate (2.5Gb/s) and half rate (5Gb/s) modes
  • Re-timer bypass up to 11.3Gb/s
  • Low output jitter
  • High input jitter tolerance, better than 0.7 UI
  • No reference clock required
  • Programmable output, with 400mV to 800mV differential output voltage range
  • Independent channel operation
  • De-emphasis to compensate up to 28dB of loss
  • I2C control interface
  • Automatically loads configuration data from E2PROM
  • Loss of signal detect with adjustable threshold
  • Low power dissipation
  • Single 3.3V supply
  • 7x7mm, 48-pin QFN package
  • GN2405A and GN2406 are fully pin compatible


  • Optical modules and active copper cable assemblies for:
    • Infiniband® SDR/DDR/QDR
    • 40Gb/s and 100Gb/s Ethernet
  • Re-timer on line card for:
    • QSFP modules
    • Parallel optical modules
    • SFP+ modules
  • 10Gb/s serial backplane retimer

Order Codes

Part No



48 pin QFN

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