1

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FN7276.1

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EL6915

Laser Diode Driver w/ Waveform Generator

The EL6915 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. 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 architecture allows reprogramming of the timers to

support different media, DVD or CD standards, and different

speeds. The programming is accomplished through a serial

interface port. Two outputs are provided to support dual-

laser multi-standard optical heads. The clock and NRZ

inputs can be either standard CMOS or LVDS, selectable

through a program bit.

The EL6915 operates on a 5V supply for the analog circuits

and a 3.3V supply for the digital circuits.

Features

• Complete programmable laser diode driver

• 350mA maximum total output

• 8-bit x 8-bit multiplying DAC output provides 8-bit full scale

adjustment and 8-bit resolution at any full scale output

• 100ps 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, and DVD+RW

• 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

select and gain select

• Programmable HFM offset 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. #

EL6915CL

38-Pin QFN

-

MDP0046

EL6915CL-T7

38-Pin QFN

7”

MDP0046

EL6915CL-T13

38-Pin QFN

13”

MDP0046

EL6915CLZ

(Note)

38-Pin QFN

(Pb-Free)

-

MDP0046

EL6915CLZ-T7

(Note)

38-Pin QFN

(Pb-Free)

7”

MDP0046

EL6915CLZ-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

July 7, 2004

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