1

®

FN7409.2

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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EL6935B

Laser Diode Driver w/ Waveform Generator

The EL6935B 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 EL6935B 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

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

• Pb-free available

Applications

• Combination DVD writable and CD writable drives

• DVD camcorders

• DVD video recorders

Ordering Information

PART NUMBER

PACKAGE

TAPE &

REEL

PKG. DWG. #

EL6935BCL

38-Pin QFN

-

MDP0046

EL6935BCL-T7

38-Pin QFN

7”

MDP0046

EL6935BCL-T13

38-Pin QFN

13”

MDP0046

EL6935BCLZ

(Note)

38-Pin QFN

(Pb-Free)

-

MDP0046

EL6935BCLZ-T7

(Note)

38-Pin QFN

(Pb-Free)

7”

MDP0046

EL6935BCLZ-T13

(Note)

38-Pin QFN

(Pb-Free)

13”

MDP0046

NOTE: Intersil Pb-free products employ special Pb-free material

sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which is compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J Std-020B.

Data Sheet

October 4, 2004

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