MAX3949 Datasheet | Maxim Integrated

Description The MAX3949 is a 3.3V, multirate, low-power laser diode driver designed for Ethernet, Fibre Channel, and SONET transmission systems at data rates up to 11.3Gbps. This device is optimized to drive a differential transmitter optical subassembly (TOSA) with a 25Ω flex circuit. The unique design of the output stage enables use of unmatched TOSAs. The device receives differential AC-coupled signals with on-chip termination. It can deliver laser modulation currents of up to 85m A at an edge speed of 22ps (20% to 80%) into a 5Ω external differential load. The device is designed to have a high-bandwidth differential signal path with on-chip back termination resistors integrated into its outputs. An input equalization block can be activated to pensate for SFP+ host connector losses. The integrated bias circuit provides programmable laser bias currents up to 105m A. Both the laser bias current generator and the laser modulator can be disabled from a single pin. The use of a 3-wire digital interface reduces the pin count while permitting adjustment of input equalization, polarity, output deemphasis, and modulation and bias currents without the need for external ponents. The device is available in a 3mm x 3mm, 16-pin TQFN package, and is specified for the -40°C to +95°C extended temperature range. Benefits and Features - - Low Power Consumption - - Saves Board Space - Small 3mm x 3mm Package - - Flexibility - Programmable Modulation Current Up to 85m A (5Ω Load) - Programmable Bias Current Up to 105m A - Programmable Input Equalization and Output Deemphasis - - Safety - Supports SFF-8431 SFP+ MSA and SFF-8472 Digital Diagnostic - Integrated Eye Safety Features with Maskable Faults - Bias Current Monitor Applications - - 10GBASE-LR SFP+ Optical Transceivers - - 10GBASE-LRM SFP+ Optical Transceivers - - OC192-SR SFP+ SDH/SONET Transceivers Ordering Information appears at end of data sheet. 19-6317; Rev 1; 4/14 11.3Gbps, Low-Power, AC-Coupled Laser...