MAX3744

2.7Gbps SFP Transimpedance Amplifiers with RSSI

2.7Gbps Transimpedance Amplifiers for Digital Diagnostic SFP Modules

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Overview

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

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 > 2mA_P-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 V_CC. 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.

Applications