EL6291C - Product Brief
Laser Diode Driver with Waveform Generator
Features
General Description
• Complete programmable laser
diode driver
• 250mA maximum output
• 8bit x 8bit multiplying DAC output
provides 8bit full scale adjustment
and 8bit resolution at any full scale
output
The EL6291C is a highly integrated laser diode driver designed to sup-
port 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 cir-
cuitry 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.
• 0.17 nsec timer resolution
• Two laser outputs allows
read/write DVD and CD
combinations
• Programmable waveform values
support 2.6GB DVD-RAM, 4.7GB
DVD-RAM, DVD-R, DVD+RW,
DVD-RW, CD-RW, and CD-R
This programmable 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 EL6291C requires 3.3V and 5V supplies, with all the logical
interface operating on the 3.3V supply.
• Analog input supports APC
• HFM oscillator programmable to
100mAP-P from 200MHz to
600MHz
The EL6291C is available in 32-pin LPP and 32-pin QFN packages
for improved thermal performance and reduced footprint.
• PLL allows reduced-frequency
clock on flex cable
• Separate serial input works up to
25Mb/sec
Connection Diagram
Applications
CLK
NRZ
1
2
3
4
5
6
7
8
9
25 VSO
24 OUT1
23 OUT1
22 GND
21 VSO
20 VSO
19 OUT2
18 OUT2
17 VSO
• Combination DVD writable and
CD writable drives
• DVD camcorders
VSL
• DVD video recorders
GND
GND
NC
Thermal Pad
Ordering Information
Part No
EL6291CY
EL6291CL
Temp. Range
0°C to +70°C
0°C to +70°C
Package
32-Pin QFN
32-Pin LPP
Outline #
MDP0045
MDP0046
VSL
VSA
RFREQ
32-Pin LPP Top View
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.