Maxim- 3V To 5.5V, 200Mbps Limiting Amplifier with Los Detector

November 6, 2003- Maxim Integrated Products introduces the MAX3645 200Mbps limiting amplifier. The MAX3645 is pin compatible with the MC2045-2Y postamp and provides increased sensitivity and loss of signal (LOS) stability. Operating from 3V to 5.5V supplies, the MAX3644* and MAX3645 form a 2-chip solution for 125Mbps Ethernet, 155Mbps SONET , and FTTx optical receiver modules. The MAX3645 is available in 16-pin SO and QSOP packages and can be used as a drop-in replacement for the MC2045.

The MAX3645 has a guaranteed 500µV single-ended input sensitivity and 750mV single-ended overload. It provides a PECL LOS with programmable thresholds. Unlike the MC2045, the signal-detect assert and deassert levels in the MAX3645 remain constant over all supply voltages. The limiting amplifier has input-referred noise of only 36µV_RMS and 0.7ns edge transition times. The MAX3645 is compatible with 4B/5B coded data and is optimized to provide symmetrical outputs to help reduce EMI.

The MAX3645 operates over the extended temperature range (-40°C to 85°C). Prices start at $0.80 (100k-up, FOB USA). An evaluation kit is available to speed designs.

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