2.7Gbps SFP Transimpedance Amplifiers with RSSI

2.7Gbps Transimpedance Amplifiers for Digital Diagnostic SFP Modules

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The MAX3744/MAX3745 transimpedance amplifiers provide a compact, low-power solution for communication up to 2.7Gbps. They feature 330nA input-referred noise at 2.1GHz bandwidth (BW) with 0.85pF input capacitance. The parts also have > 2mAP-P AC input overload.

Both parts operate from a single +3.3V supply and consume 93mW. The MAX3744/MAX3745 are in a compact 30-mil x 50-mil die and require no external compensation capacitor. A space-saving filter connection is provided for positive bias to the photodiode through an on-chip 580Ω resistor to VCC. These features allow easy assembly into a low-cost TO-46 or TO-56 header with a photodiode.

The MAX3744 and MAX3748A receiver chip set provides an RSSI output using a Maxim interface technique. The MAX3744 preamplifier, MAX3748A postamplifier, and DS1858/DS1859 SFP controller meet all the SFF-8472 digital diagnostic requirements.
MAX3744, MAX3745: Functional Diagram MAX3744, MAX3745: Functional Diagram Enlarge+

Key Features

  • Up to 2.7Gbps (NRZ) Data Rates
  • RSSI Implementation in 4-Pin TO-46 Header (MAX3744)
  • 10psP-P Deterministic Jitter for < 100µAP-P Input Current
  • 330nARMS Input-Referred Noise at 2.1GHz Bandwidth
  • 28mA Supply Current at +3.3V
  • 2GHz Small-Signal Bandwidth
  • 2.0mAP-P AC Overload
  • Die Size: 30 mils x 50 mils


  • Optimized for Small-Form-Factor Pluggable (SFP) Optical Receivers
  • Up to 2.7Gbps SFF/SFP Optical Receivers
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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