The MAX3865 is designed for direct modulation of laser diodes at data rates up to 2.5Gbps. It incorporates two feedback loops, the automatic power-control (APC) loop and the automatic modulation-control (AMC) loop, to maintain constant average optical output and extinction ratio over temperature and laser lifetime. External resistors or current output DACs may set the laser output levels. The driver can deliver up to100mA of laser bias current and up to 60mA laser modulation current with a typical (20% to 80%) edge speed of 84ps. The MAX3865 accepts differential clock and data input signals with on-chip 50 termination resistors. The inputs can be configured for CML or other high-speed logic. An input data-retiming latch can be enabled to reject input pattern-dependent jitter when a clock signal is available. The MAX3865 provides laser bias current and modulation current monitors, as well as a failure detector, to indicate the laser operating status. These features are all implemented on an 81mil 103mil die; the MAX3865 is also available as a 32-pin QFN package.