Low-Power, 622Mbps to 3.2Gbps Limiting Amplifier

Low-Power, Compact, Multirate Limiting Amplifier for SFF/SFP Applications Functions as a Data Quantizer for SONET, Fibre-Channel and Gigabit Ethernet Optical Receivers

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The MAX3746 multirate limiting amplifier functions as a data quantizer for SONET, Fibre-Channel, and Gigabit Ethernet optical receivers. The amplifier accepts a wide range of input voltages and provides selectable-level, current-mode logic (CML) output voltages with controlled edge speeds. A received-signal-strength indicator (RSSI) is available when the MAX3746 is DC-coupled to the MAX3744/MAX3724 SFP transimpedance amplifier (TIA). A receiver consisting of the MAX3744/MAX3724 and the MAX3746 can provide up to 19dB RSSI dynamic range. Additional features include a programmable loss-of-signal (LOS) detect, an optional disable function (DISABLE), and an output-signal polarity reversal (OUTPOL). Output disable can be used to implement squelch.

The combination of the MAX3746 and the MAX3744/MAX3724 allows for the implementation of all the small-form-factor SFF-8472 digital diagnostic specifications using a standard 4-pin TO-46 header.

The MAX3746 is pin-for-pin compatible with the MAX3748A limiting amplifier and consumes 30% less power. The MAX3746 is packaged in a 3mm x 3mm, 16-pin QFN package.
MAX3746: Typical Operating Circuit MAX3746: Typical Operating Circuit Enlarge+

Key Features

  • SFP Reference Design Available
  • Low 115mW Power Consumption
  • 16-Pin QFN Package with 3mm x 3mm Footprint
  • 70ps Rise and Fall Time
  • Loss-of-Signal with Programmable Threshold
  • RSSI Interface (with MAX3744/MAX3724 TIA)
  • Output Disable
  • Polarity Select
  • 8.4psP-P Deterministic Jitter (3.2Gbps)
  • Improved EMI Performance
  • Selectable CML Output levels
  • Pin Compatible with MAX3748A


  • Fibre Channel SFF/SFP Transceiver Modules
  • Gigabit Ethernet SFF/SFP Transceiver Modules
  • Multirate OC-12 to OC-48 FEC SFF/SFP
  • Transceiver Modules
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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