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MAX3724, MAX3725
3.2Gbps SFP Transimpedance Amplifiers with RSSI

Not Recommended for New Designs
Part Number Replacement Explanation
MAX3724E/D n/a This product is no longer available.
MAX3725E/D n/a


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Description
FULL DATA SHEET (PDF, 576kB)
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The MAX3724/MAX3725 transimpedance amplifiers provide a compact, low-power solution for communication up to 3.2Gbps. They feature 325nA input-referred noise at 2.1GHz bandwidth (BW) with 0.6pF input capacitance. The parts also have >2mAP-P AC input overload.

Both parts operate from a single +3.3V supply and consume 93mW. The MAX3724/MAX3725 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 MAX3724 and MAX3748A receiver chip set provides an RSSI output using a Maxim-proprietary* interface technique. The MAX3724 preamplifier, MAX3748A postamplifier, and the DS1858/DS1859 SFP controller meet all the SFF-8472 digital diagnostic requirements.

Key Features   Applications/Uses
  • Wider Bandwidth than MAX3744/MAX3745
  • RSSI Implementation in 4-Pin TO-46 Header (MAX3724 and MAX3748A)
  • 8psP-P Deterministic Jitter for <100µAP-P Input Current
  • 325nARMS Input-Referred Noise at 2.1GHz Bandwidth
  • 28mA Supply Current at +3.3V
  • 2.5GHz Small-Signal Bandwidth
  • 2.0mAP-P AC Overload
  • Die Size: 30 mils x 50 mils (Identical to the MAX3744/MAX3745)

 
  • Optimized for Small-Form-Factor Pluggable (SFP) Optical Receivers
  • Up to 3.2Gbps SFF/SFP Optical Receivers

    *Patent pending.

    Diagram
    MAX3724, MAX3725: Typical Application Circuit
    Typical Application Circuit

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    Document Ref.: 19-3181; Rev 1; 2005-12-14
    This page last modified: 2007-08-27


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