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LMH6533 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LMH6533 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LMH6533 Four –Channel Laser Diode Driver with Dual Output, LVDS Interface and HFM Oscillator General Description The LMH™ 6533 is a laser diode driver for use in combina- tion 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 in- cludes read, write and erase through four separate switched current channels. The channel currents are summed to- gether at the selected output to generate multilevel wave- forms 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 opti- mized 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 oscilla- tor 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 set- ting. The write and erase channels can be switched on and off through dedicated LVDS interface pins. Features n Fast switching: Rise and fall times <0.8 ns n Low voltage differential signaling (LVDS) channels enable interface for the fast switching lines n Low output current noise: <0.5nA/ n Dual output: Selectable by SELB pin (active HIGH) n 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 n 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 n Complete shutdown by ENABLE pin n 5V single-supply operation n Logic inputs TTL and CMOS compatible n Space saving Leadless Leadframe Package LLP®-28 Applications n Combination DVD/CD recordable and rewritable drives n DVD camcorders n DVD video recorders Block Diagram 20027701 LMH™ is a trademark of National Semiconductor Corporation. VIP10™ is a trademark of National Semiconductor Corporation. LLP® is a registered trademark of National Semiconductor. May 2004 © 2004 National Semiconductor Corporation DS200277 www.national.com |
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