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The ISL58728 is a highly integrated laser diode driver designed to support dual-laser multi-standard writable optical drives. Operating from 2.5V digital and 5V analog supplies, it directly drives cathode-grounded DVD and CD lasers and Blue lasers whose anode is connected to a high voltage supply. This triple driver offers a great degree of configurability via a serial interface and eliminates the need for glue logic and a negative supply.

An integrated write-strategy generator translates the incoming NRZ serial data stream from the host into output waveforms to drive a laser. The desired current levels and timing details are programmed through a serial interface port to support different media, standards, and speeds.

The CLK and NRZ inputs can be configured to accept either standard CMOS or LVDS signals.

Key Features

• 463MHz operation with T/40 time resolution
• Direct drive for Blue, DVD, and CD lasers
• 700mA maximum total output
• 10-bit x 10-bit multiplying DAC output provides 10-bit full scale adjustment and 10-bit resolution at any full scale output
• Two RAM banks for synchronized switching of timing and power parameters
• Three laser outputs allow read/write Blue, DVD, and CD combinations
• Programmable waveform generator supports CD-R, CD-RW, DVD-RAM, DVD±R, DVD±RW, and Blue
• PLL allows reduced-frequency clock on flex cable
• Separate serial input works up to 100MHz
• Two analog inputs support slope and read APC
• HFM oscillator programmable to 100mAP-P from 100MHz to 500MHz
• Programmable DC output when HFM is off
• Pb-free plus anneal (RoHS compliant)

Applications

• Combination Blue, DVD, and CD writable drives
• HD camcorders
• RWB HD video recorders