EL6938 Datasheet, PDF (1/2 Pages) Intersil Corporation – Laser Diode Driver with Waveform Generator

®
Data Sheet
June 24, 2004
EL6938
FN7410
Laser Diode Driver with Waveform
Generator
The EL6938 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 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.
The EL6938 requires 2.5V and 5V supplies, with all the
logical interface operating on the 2.5V supply.
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Features
• Complete 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
• 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
• Two analog inputs support slope and read APC
• HFM oscillator programmable to 100mA_P-P from 100MHz
to 500MHz
• 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
Applications
• Combination DVD writable and CD writable drives
• DVD camcorders
• DVD video recorders
Ordering Information
PART NUMBER
PACKAGE
TAPE &
REEL PKG. DWG. #
EL6938CL
32-Pin QFN (5x6mm)
-
MDP0046
EL6938CL-T7 32-Pin QFN (5x6mm) 7”
MDP0046
EL6938CL-T13 32-Pin QFN (5x6mm) 13”
MDP0046
EL6938CLZ
32-Pin QFN (5x6mm)
-
(See Note)
(Pb-Free)
MDP0046
EL6938CLZ-T7 32-Pin QFN (5x6mm) 7”
(See Note)
(Pb-Free)
MDP0046
EL6938CLZ-T13 32-Pin QFN (5x6mm) 13”
(See Note)
(Pb-Free)
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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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