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Compact multirate limiting amplifier

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MAXIM Integrated Products, represented by Arrow Electronics , has introduced the MAX3748 +3.3V, multirate, limiting amplifier with a programmable loss-of-signal indicator.

Combining the MAX3748 limiting amplifier with the MAX3744 transimpedance amplifier and MAX3735/MAX3740 laser drivers forms an ideal 3-chip solution for SFP modules with digital diagnostic capability.

The MAX3748 operates from 155Mbps up to 3.2Gbps and can be dc-coupled to the TIA. This device is ideal for SFF and SFP digital diagnostic modules for SONET, gigabit Ethernet, and fibre channel applications.

When dc-coupled to the MAX3744 TIA, the MAX3748 provides a receive-signal-strength indicator (RSSI) for digital diagnostic applications. This RSSI can be used for receive-power monitoring.

This product combination implements SFF-8472 digital diagnostics while allowing the TIA to be packaged in a low-cost 4-pin TO-46 header.

Operating from a single +3.3V supply, the MAX3748 has greater than 5mV input sensitivity and 185 microvolts root mean square input-referred noise. It consumes only 100mW of power.

A programmable signal-detect function adjusts to different assert and deassert levels, maintaining a 2.2dB hysterisis. The MAX3748 has low 8ps deterministic jitter and 3ps root mean square random jitter, and input voltages from 5mV to 1200mV.

It typically provides a 800mV output.

The MAX3748 is available in a 3mm x 3mm 16-pin QFN package over the extended temperature range.

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