EL6935 - Intersil Corporation

FN7409.1

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EL6935

Laser Diode Driver w/Waveform Generator

The EL6935 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 generator 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. The part also has an IV

amplifier with concurrent read and write sampling. The gains

of the IV amplifier are programmable, eliminating the need

for external potentiometers.

The flexible architecture supports different media and

speeds for Blue, DVD, and CD standards. The programming

is accomplished through a serial interface port. The clock

and NRZ inputs can be either standard CMOS or LVDS,

selectable through a program bit.

The EL6935 operates on a 5V supply for the analog circuits

and a 2.5V supply for the digital circuits.

Features

• Completely programmable laser diode driver

• 500mA 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

• 55psec timer resolution

• Two laser outputs allows read/ write DVD and CD

combinations

• Programmable waveform values support CD-R, CD-RW,

DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW, and

Blue

• Two analog inputs support slope and read APC

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

to 500MHz

• PLL allows reduced-frequency clock on flex cable

• Separate serial input works up to 100MHz

• Dual sampled IV amplifier with programmable sample and

gain selects

• Programmable DC output when HFM is off

Applications

• Combination DVD writable and CD writable drives

• DVD camcorders

• DVD video recorders

Ordering Information

PART

NUMBER PACKAGE TAPE & REEL PKG. DWG. #

EL6935CL 38-Pin QFN - MDP0046

EL6935CL-T7 38-Pin QFN 7” MDP0046

EL6935CL-T13 38-Pin QFN 13” MDP0046

Data Sheet August 18, 2004

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notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and

reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result

from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

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EL6935