EL6939
®
Data Sheet
March 9, 2005
FN7469.0
Laser Diode Driver with Waveform
Generator
Features
• Complete programmable laser diode driver
• 600mA maximum total output
The EL6939 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.
• 10-bit x 10-bit multiplying DAC output provides 10-bit full
scale adjustment and 10-bit resolution at any full scale
output
• 54 psec 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
The architecture allows reprogramming of the timers to
support different media, Blue, 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.
• Two analog inputs support slope and read APC
• HFM oscillator programmable to 100mA
to 500MHz
from 100MHz
P-P
• PLL allows reduced-frequency clock on flex cable
• Separate serial input works up to 100MHz
• Programmable HFM offset when HFM is off
• Pb-free available (RoHS compliant)
The EL6939 requires 2.5V and 5V supplies, with all the
logical interface operating on the 2.5V supply.
Ordering Information
TAPE &
REEL
Applications
PART NUMBER
EL6939CL
PACKAGE
32-Pin QFN
32-Pin QFN
32-Pin QFN
PKG. DWG. #
MDP0046
MDP0046
MDP0046
MDP0046
• Combination DVD writable and CD writable drives
• DVD camcorders
-
7”
13”
-
EL6939CL-T7
EL6939CL-T13
• DVD video recorders
EL6939CLZ
(Note)
32-Pin QFN
(Pb-Free)
EL6939CLZ-T7
(Note)
32-Pin QFN
(Pb-Free)
7”
MDP0046
MDP0046
EL6939CLZ-T13
(Note)
32-Pin QFN
(Pb-Free)
13”
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NOTE: Intersil Pb-free products employ special Pb-free material sets;
molding compounds/die attach materials and 100% matte tin plate
termination finish, which are RoHS compliant and 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-020C.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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