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MAX3956：11.3Gbps Transceiver with Digital Monitors and DC-Coupled Laser Driver

Lowest Power and Highest Integration Solution for SFP+ Optical Module

The MAX3956 is an 11.3Gbps, highly-integrated, low-power transceiver with digital diagnostics monitoring (DDM) designed for next-generation Ethernet transmission systems. The receiver incorporates a limiting amplifier and loss-of-signal (LOS) circuit. The limiting amplifier features dual-path architecture optimizing the performance for signals up to 4.25Gbps and up to 11.3Gbps, respectively. The transmitter incorporates Maxim’s proprietary DC-coupled laser driver interface and closed-loop control of laser average power. This part is optimized to enable 0.8W maximum power dissipation target of SFP+ MSA based modules. The MAX3956 supports differential AC-coupled signaling with 50Ω termination at Rx input, Rx output, and Tx input. The Tx output is a DC-coupled 25Ω laser diode interface with dedicated pins for the laser anode (TOUTA) and the laser cathode (TOUTC). An integrated 12-bit analog-to-digital converter (ADC) is utilized to provide digital monitors of internal/external temperature, VCC, and received signal strength indication (RSSI). The MAX3956’s digital monitors and the use of a 2-wire or 3-wire slave interface enables configuration through a digital-only microcontroller (µC). The MAX3956 operates from a single +3.3V supply and over a -40°C to +95°C temperature range and is available in a standard 5mm x 5mm, 32-pin TQFN-EP package.

Key Features Low Power Consumption Enables < 0.8W Total SFP+ Module Power Dissipation 380mW Typical IC Power Dissipation at 3.3V (ILD_MOD = 45mA, IBIAS = 45mA) Flexibility Multirate up to 11.3Gbps (NRZ) Operation with Rate Select for 1.25Gbps to 4.25Gbps Operation Programmable Laser-Diode Modulation Current from 10mA to 85mA Programmable Tx Input Equalization and Rx Output Deemphasis Safety and Monitoring Integrated Eye Safety Features with Maskable Fault and Interrupt Signal Generation Analog Monitors with Integrated 12-Bit ADC, Fully Supporting SFF-8472 DDM Accurate Analog Measurements High-Accuracy Temperature, VCC, and RSSI Sensors Enables Use of Simple Digital-Only µC

MAX3956: Simplified Block Diagram Applications/Uses 10GBASE-LR SFP+ Optical Transceivers

DataSheet

Parametrics

Quality and Environmental Data

• MAX3956.pdf

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