Dual-Rate Fibre Channel Limiting Amplifier

1.0625Gbps/2.215Gbps Fibre Channel Limiting Amplifier with On-Chip, Fourth-Order Filter

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The MAX3274 dual-rate Fibre Channel limiting amplifier is optimized for use in dual-rate 2.125Gbps/1.0625Gbps Fibre Channel optical receiver systems. An on-chip selectable fourth-order Bessel Thompson filter offers 15dB (typ) of attenuation at 2GHz to suppress the relaxation oscillation (RO) found in legacy transmitters. The amplifier accepts a wide range of input voltages and provides constant-level output voltages with controlled edge speeds. Receivers using the MAX3275/MAX3277 transimpedance amplifiers (TIA) and the MAX3274 dual-rate limiting amplifier can meet the Fibre Channel receiver sensitivity optical modulation amplitude (OMA) specification of 49mWP-P at 2.125Gbps and 31mWP-P at 1.0625Gbps. Additional features include a programmable threshold loss-of-signal (LOS) detector, output squelch, and bandwidth select. The MAX3274 features current-mode logic (CML) data outputs. The MAX3274 is available in a 16-pin QFN package, making it ideal for GBIC and small form-factor receiver modules.
MAX3274: Typical Operating Circuit MAX3274: Typical Operating Circuit Enlarge+

Key Features

  • Dual-Rate 1.0625Gbps/2.125Gbps Operation
  • On-Chip Selectable 4th-Order Filter
  • Relaxation Oscillation Suppression of Legacy, CD Laser-Based Transmitters
  • Available in a 100Ω Output Termination
  • Programmable Loss-of-Signal (LOS) Threshold
  • Output Squelch Control
  • Power-On Reset Minimizes Inrush Current
  • 4mm x 4mm 16-Pin QFN Package
  • Applications/Uses

    • Dual-Rate Fibre Channel SFF/SFP Optical Modules
    • Fibre Channel GBIC Optical Modules
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