MAX3946ETG+T

The MAX3946ETG+T is a 1Gbps to 11.3Gbps SFP+ laser driver with laser impedance mismatch tolerance in 24 pin TQFN package. This 3.3V, multirate, low power laser diode driver is designed for Ethernet and fibre channel transmission systems at data rates up to 11.3Gbps. It is optimized to drive a differential transmitter optical subassembly (TOSA) with 25ohm flex circuit. It can deliver laser modulation current of up to 80mA at an edge speed of 22ps (20% to 80%) into 5ohm to 25ohm external differential load. The integrated bias circuit provides programmable laser bias current up to 80mA. A 3-wire digital interface reduces pin count and permits adjustment of input equalization, pulse width adjustment, Tx polarity, Tx deemphasis, modulation current and bias current without need for external components. It is used in OC192-SR XFP/SFP+ SDH/SONET transceivers, 4x/8x FC SFP+, 10GFC SFP+, 10GBASE-LR SFP+ and 10GBASE-LRM SFP+ optical transceivers.

• Power supply voltage range from 2.85V to 3.63V and power supply current of 68mA
• Power supply noise of 100mVP-P (DC to 10MHz) and 10mVP-P (10MHz to 20MHz)
• 225mW power dissipation enables <lt/> 1W SFP+ modules and 10Gbps input data rate
• Up to 100mW power consumption reduction by enabling use of unmatched FP/DFB TOSAs
• Supports SFF-8431 SFP+ MSA and SFF-8472 digital diagnostic
• 10mA to 100mA programmable modulation current (5ohm load) & 5mA to 80mA programmable bias current
• Programmable input equalization and programmable output deemphasis
• Programmable pulse width, edge transition time of 22ps and bias current monitor
• 25ohm output back termination at TOUT+ and TOUTS-
• Deterministic jitter of 5psP-P (10mA ≤ IMOD ≤ 60mA, 11.3Gbps) and random jitter of 0.19psRMS

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Communications & Networking

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