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PDF LMH6533 Data sheet ( Hoja de datos )
| Número de pieza | LMH6533 | |
| Descripción | Four - Channel Laser Diode Driver with Dual Output / LVDS Interface and HFM Oscillator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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May 2004
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
LMH™ is a trademark of National Semiconductor Corporation.
VIP10™ is a trademark of National Semiconductor Corporation.
LLP® is a registered trademark of National Semiconductor.
© 2004 National Semiconductor Corporation DS200277
20027701
www.national.com
1 page  
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Description
Laser driver output channel A
Internal Oscillator Enable pin
Temp Sensing Diode
Read Channel Enable pin
Chip Enable pin
Supply Voltage A
Ground Connection A
Read Channel current setting
Channel 2 current setting
Channel 3 current setting
Channel 4 current setting
Oscillator Frequency setting Channel A
Oscillator Frequency setting Channel B
Oscillator Amplitude setting Channel A
Oscillator Amplitude setting Channel B
Channel select B
LVDS input Channel 2B
LVDS input Channel 2
LVDS input Channel 3B
LVDS input Channel 3
LVDS input Channel 4B
LVDS input Channel 4
NC
Supply Voltage
Supply Voltage
Supply Voltage
Laser driver output channel B
Ground Connection B
Remark
Oscillator activated if pin is high
See application note on using this pin
Read Channel Enabled if pin is high
Chip Enabled if pin is high
Set by external resistor to ground
Set by external resistor to ground
Set by external resistor to ground
Set by external resistor to ground
Channel B selected if pin is high
Channel 2 active if logical input is low
Channel 2 active if logical input is high
Channel 3 active if logical input is low
Channel 3 active if logical input is high
Channel 4 active if logical input is low
Channel 4 active if logical input is high
Truth Tables
Enable
0
1
1
1
1
1
ENR
X
0
1
1
1
1
EN2
X
0
0
1
0
0
IOUT CONTROL
EN3
X
0
0
0
1
0
EN4
X
0
0
0
0
1
Enable
0
1
1
ENOSC
x
0
1
OSCILLATOR CONTROL
ENR
x
x
x
EN2
x
x
x
EN3
x
x
x
IOUT
OFF
OFF
AR*IINR
AR*IINR+A2*IIN2
AR*IINR+A3*IIN3
AR*IINR+A4*IIN4
EN4
x
x
x
Oscillator
OFF
OFF
on
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
28-Pin LLP
NS Package Number SPA28A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification
(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
National Semiconductor
Americas Customer
Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: [email protected]
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: [email protected]
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: [email protected]
Tel: 81-3-5639-7560
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LMH6533.PDF ] | |
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