General Description

The EL6291C 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.

Features

• Complete programmable laser diode driver

• 250mA maximum output

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

• 0.17 nsec timer resolution

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

• Programmable waveform values support 2.6GB DVD-RAM, 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

Applications

• Combination DVD writable and CD writable drives

• DVD camcorders

• DVD video recorders