|
Features
Fast switching: Rise and fall times <0.8 ns
Low voltage differential signaling (LVDS) channels enable interface for the fast switching lines
Low output current noise: <0.5nA/
Dual output: Selectable by SELB pin (active HIGH)
Four independent current channels
|
Gain of 300, 300 mA write channel
|
|
Gain of 150, 150 mA low-noise read channel
|
|
Two gain of 150, 150 mA write channels
|
|
500 mA minimum combined output current
|
Integrated AC Coupled HFM Oscillator
|
Selectable frequency and amplitude setting by external resistors
|
|
200 MHz to 600 MHz frequency range
|
|
Amplitude to 100 mA peak-to-peak modulation
|
Complete shutdown by ENABLE pin
5V single-supply operation
Logic inputs TTL and CMOS compatible
Space saving Leadless Leadframe Package LLP-28
Description The LMH 6533 is a laser diode driver for use in combination DVD/CD recordable and rewritable systems. The part contains two high-current
outputs for reading and writing the DVD (650 nm) and CD (780 nm) lasers. Functionality includes read, write and erase through
four separate switched current channels. The channel currents are summed together at the selected output to generate multilevel
waveforms for reading, writing and erasing of optical discs. The LVDS interface delivers DVD write speeds of 12x and higher
while minimizing noise and crosstalk. The LMH6533 is optimized for both speed and power consumption to meet the demands of
next generation systems. The part features a 150 mA read channel plus one 300 mA and two 150 mA write channels, which can
be summed to allow a total output current of 500 mA or greater. The channel currents are set through four independent current
inputs.
The part is manufactured in National Semiconductor’s VIP10 process, which features bonded wafer technology and trench isolation for very high switching speeds at low power levels.
An on-board High-Frequency Modulator (HFM) oscillator helps reduce low-frequency noise of the laser and is enabled with the
ENOSC pin. The fully differential oscillator circuit minimizes supply line noise, easing FCC approval of the overall system.
The SELB pin (active HIGH) selects the output channel and oscillator settings. External resistors determine oscillator frequency
and amplitude for each setting. The write and erase channels can be switched on and off through dedicated LVDS interface pins.
Applications
Combination DVD/CD recordable and rewritable drives
DVD camcorders
DVD video recorders
|
Also Recommended
| LMH6525▲ | Four-Channel Laser Diode Driver With Dual Output And LVDS Enabled HFM Oscillator Inputs |
| LMH6526▲ | Four-Channel Laser Diode Driver With Dual Output And Single-Ended Enabled HFM Oscillator Inputs |
|
|
