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LMH6533SP
Four -Channel Laser Diode Driver with Dual Output, LVDS Interface and HFM Oscillator
LMH6533
Four –Channel Laser Diode Driver with Dual Output,
LVDS Interface and HFM Oscillator
General DescriptionThe LMH™ 6533isa laser diode driverfor usein combina-
tion DVD/CD recordable and rewritable systems. The part
contains two high-current outputsfor reading and writingthe
DVD (650 nm) and CD (780 nm) lasers. Functionalityin-
cludes read, write and erase through four separate switched
current channels. The channel currents are summed to-
getherat the selected outputto generate multilevel wave-
formsfor reading, writing and erasingof optical discs. The
LVDS interface delivers DVD write speedsof 12x and higher
while minimizing noise and crosstalk. The LMH6533is opti-
mizedfor both speed and power consumptionto meet the
demandsof next generation systems. The part featuresa
150mA read channel plus one 300mA and two 150mA write
channels, which canbe summedto allowa total output
currentof 500 mAor greater. The channel currents are set
through four independent current inputs.
The partis manufacturedin National Semiconductor’s
VIP10™ process, which features bonded wafer technology
and trench isolationfor very high switching speedsat low
power levels.An on-board High-Frequency Modulator (HFM)
oscillator helps reduce low-frequency noiseofthe laser and enabled withthe ENOSC pin. The fully differential oscilla-
tor circuit minimizes supply line noise, easing FCC approval the overall system. The SELBpin (active HIGH) selects
the output channel and oscillator settings. External resistors
determine oscillator frequency and amplitudefor each set-
ting. The write and erase channels canbe switchedon and
off through dedicated LVDS interface pins.
Features Fast switching: Rise andfall times <0.8ns Low voltage differential signaling (LVDS) channels
enable interfaceforthe fast switching lines Low output current noise: <0.5nA/ Dual output: Selectableby SELBpin (active HIGH) Four independent current channels Gainof 300, 300 mA write channel Gainof 150, 150 mA low-noise read channel Two gainof 150, 150 mA write channels 500 mA minimum combined output current IntegratedAC Coupled HFM Oscillator Selectable frequency and amplitude settingby
external resistors 200 MHzto 600 MHz frequency range Amplitudeto 100 mA peak-to-peak modulation Complete shutdownby ENABLEpin5V single-supply operation Logic inputs TTL and CMOS compatible Space saving Leadless Leadframe Package LLP®-28
Applications Combination DVD/CD recordable and rewritable drives DVD camcorders DVD video recorders
Block DiagramMay 2004
LMH6533
Four
Channel
Laser
Diode
Driver
with
Dual
Output,
VDS
Interface
and
HFM
Oscillator
