MAX3735

19-2529; Rev 1; 4/03 KIT ATION EVALU E L B AVAILA 2.7Gbps, Low-Power SFP Laser Drivers General Description Features o SFP Reference Design Available o Fully Compliant with SFP and SFF-8472 MSAs o Programmable Modulation Current from 10mA to 60mA (DC-Coupled) o Programmable Modulation Current from 10mA to 85mA (AC-Coupled) o Programmable Bias Current from 1mA to 100mA o Edge Transition Times <51ps o 27mA (typ) Power-Supply Current o Multirate 155Mbps to 2.7Gbps Operation o Automatic Average Power Control o On-Chip Pullup Resistor for TX_DISABLE o 24-Pin 4mm × 4mm QFN package MAX3735/MAX3735A The MAX3735/MAX3735A are +3.3V laser drivers for SFP/SFF applications from 155Mbps up to 2.7Gbps. The devices accept differential input data and provide bias and modulation currents for driving a laser. DCcoupling to the laser allows for multirate applications and reduces the number of external components. The MAX3735/MAX3735A are fully compliant with the SFP MSA timing and the SFF-8472 transmit diagnostic requirements. An automatic power-control (APC) feedback loop is incorporated to maintain a constant average optical power over temperature and lifetime. The wide modulation current range of 10mA to 60mA (up to 85mA AC-coupled) and bias current of 1mA to 100mA make this product ideal for driving FP/DFB laser diodes in fiber-optic modules. The resistor range for the laser current settings is optimized to interface with the DS1858 SFP controller IC. The MAX3735/MAX3735A provide transmit...