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10Gbps chipset consumes only 355mW

Fri, 05/28/2010 - 6:44am
MAX3946Maxim Integrated Products introduces a 1.0625Gbps to 11.3Gbps transmit/receive solution composed of the MAX3946 laser driver with impedance-mismatch tolerance and the MAX3945 dual-path limiting amplifier. This 10GBASE-SR/LR SFP+ transmit/receive chipset enables < 1W SFP+ optical modules while reducing overall module cost. The combined power consumption of the MAX3946 and MAX3945 is only 355mW, leaving plenty of margin for the optical subsystem and control. Both ICs include a 3-wire digital control interface with integrated control DACs to reduce external component count. Outstanding jitter performance eases design tolerances and improves manufacturing yield in SFP+ optical transceivers. This chipset is optimized for Ethernet and Fibre Channel transmission systems at data rates up to 11.3Gbps.

The MAX3946 is a 3.3V, multirate laser diode driver that is optimized to drive a differential transmitter optical subassembly (TOSA) with a 25ohm flex circuit up to 100mA modulation current and up to 80mA bias current. The unique design of the output stage enables the use of unmatched TOSAs to reduce headroom limitations and lower module power consumption by 100mW, with only 5psP-P deterministic jitter.

The MAX3945 is a 3.3V, multirate, high-sensitivity limiting amplifier that limits the signal generated by a transimpedance amplifier into a CML-level differential output signal. The dual-path limiting amplifier's programmable filter optimizes sensitivity for different data rates and suppresses relaxation oscillations that could occur in legacy optical systems.

The MAX3946 is packaged in a 4mm x 4mm, 24-pin TQFN, and the MAX3945 is offered in a 3mm x 3mm, 16-pin TQFN. Both devices are guaranteed by design and characterization to operate over the -40 degrees Celsius to +95 degrees Celsius extended temperature range. Pricing starts at $3.60 (1000-up, FOB USA).

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