The EL6293 is a highly integratedlaser diode driver designed to supportmulti-standard writable optical drives.It accomplishes this by incorporating a waveform generatorwherein the diode currents and timing details can beprogrammed before operation. The data input circuitryinspects the NRZ serial data waveform and generatesprogrammed waveforms in recognition of 3, 4, 5, or 6 ormore clock periods of space changing to 3, 4, 5, or 6 or moreclock periods of mark, and vice versa.This programmable architecture allows reprogramming ofthe timers to support different media, DVD or CD standards,and different speeds. The programming is accomplishedthrough a serial interface port. Two outputs are provided tosupport dual-laser multi-standard optical heads.The EL6293 also contains a fast I/V amplifier withprogrammable sampler that allows the user to sample anylevel of the output waveform by using an externalphotodiode.The EL6293 requires 3.3V and 5V supplies, with all thelogical interface operating on the 3.3V supply.
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