The TDA3050 is a fully integrated laser driver for burst mode optical transmission systems with data rates up to 1.25 Gbits/s. The TZA3050 incorporates all necessary control and protection functions for a laser driver application with very few external components required and low power dissipation. The average-loop controls the average monitor current in a typical programmable range from 150 ƒÝA to 1300 ƒÝA. The average-loop settings are memorized internally between bursts of data. The bias and modulation currents have a fast switch on and off time of less than 100 ns. The design is made in the Philips BiCMOS RF process and is available in a HBCC32 package. The TZA3050 is intended for use in an application with a DC-coupled laser diode for both 3.3 V and 5 V laser supply voltages. The BIAS output is optimized for low voltage requirements giving a minimum of 1.25 V for 3.3 V and 5 V laser supplies.