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®
FN7409
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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EL6935
Laser Diode Dri ver w/ Waveform Generator
The EL6935 is a high ly 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 clo ck period s of sp ace chan ging to 3, 4, 5, or 6 or mo re
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, Blue, DVD, or CD standards, and
diff eren t spee ds. The program ming is acco mplis hed th rough
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 prog ram bit.
The EL6935 operates on a 5V supply for the analog circuits
and a 2.5V supply for the digital circuits.
Features
• Complete programmable laser diode driver
• 450mA 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
• 60psec 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
select and gain select
• Programmable HFM offset 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 LPP - MDP0046
EL6935CL-T7 38-Pin LPP 7” MDP0046
EL6935CL-T13 38-Pin LPP 13” MDP0046
Data Sheet February 18, 2004
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EL6935
