Laser Diode Driver with Waveform Generator

The EL6298 is a highly integrated laser diode driver designed to support multi-standard writable optical drives. It accomplishes this by incorporating a waveform generator wherein the diode currents and timing details can be programmed before operation. The data input circuitry inspects the NRZ serial data waveform and generates programmed waveforms in recognition of 3, 4, 5, or 6 or more clock periods of space changing to 3, 4, 5, or 6 or more clock periods of mark, and vice versa. NRZ and clock are LVDS.

Features

• 4MHz - 200MHz clock

• Complete programmable laser diode driver

• 250mA maximum write output

• 8-bit x 8-bit multiplying DAC output provides 8-bit full scale adjustment and 8-bit resolution at any full scale output

• 0.12ns timer resolution

• Two laser outputs allows read/write DVD and CD combinations

• Programmable waveform values support 2.6GB DVDRAM, 4.7GB DVD-RAM, DVD-R, DVD+RW, DVD-RW, CD-RW, and CD-R

• Analog input supports APC

• HFM oscillator programmable to 100mAP-P from 200MHz to 600MHz

• PLL allows reduced-frequency clock on flex cable

• Separate serial input works up to 25Mb/sec

• Pb-free available

Applications

• Combination DVD writable and CD writable drives

• DVD camcorders

• DVD video recorders