LMH6533 Four –Channel Laser Diode Driver with Dual Output, LVDS Interface and HFM Oscillator General Description Features The LMH™ 6533 is a laser diode driver for use in combina- 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 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 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 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. © 2004 National Semiconductor Corporation DS200277 www.national.com LMH6533 Four –Channel Laser Diode Driver with Dual Output, LVDS Interface and HFM Oscillator May 2004 LMH6533 Absolute Maximum Ratings (Note 1) Operating Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Operating Temp. Range (TA) (Note 8) ESD Tolerance Human Body Model 200V (Note 3) + − Supply Voltage (V – V ) 5.5V Differential Input Voltage ± 5.5V Output Short Circuit to Ground (Note 4) Input Common Mode Voltage Storage Temperature Range Junction Temperature (Note 5) −40˚C ≤ TA ≤ 85˚C Thermal Resistance (Note 5), (Note 8) 2KV (Note 2) Machine Model 4.5V ≤ VS ≥ 5.5V Supply Voltage (V+ - V−) LLP Package θJC 3˚C/W θJA (no heatsink) 42˚C/W θJA (with heatsink) see (Note 9) Continuous V– to V+ 1.5 mA (max) IIN2 1.0 mA (max) RFREQ −65˚C to +150˚C +150˚C 30.8˚C/W IINR/3/4 1000Ω (min) RAMP 300Ω FOSC 100-600 MHz AOSC 10-100 mAPP +5V DC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, RL = 10Ω. Boldface limits apply at the temperature extremes. (Note 8) Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units LVDS VI Input Voltage Range |VGPD| < 50 mV (Note 7), (Note 9), (Note 11) 825 1550 1575 mV VIDTH Input Diff. Threshold VGPD < 50 mV (Note 7), (Note 9), (Note 11) –100 0 100 mV VHYST Input Diff. Hysteresis VIDTHH – VIDTH1 (Note 7), (Note 9), (Note 11) 25 0 RIN Input Diff. Impedance (Note 7), (Note 9),(Note 11) 80 104 120 Ω IIN Input Current Excluding RIN Current VCM = 1.25V 5 50 µA mV Current Channels RIN Input Resistance all Channels RIN to Ground 425 556 675 Ω IOS Current Offset All Channels Off (Note 12) –7.5 4.75 7.5 mA AIW Current Gain Channel 2 (Note 13) 270 303 330 A/A AIR Current Gain Channels 3,4 and Read (Note 13) 135 152 165 A/A ILIN-R,3,4 Output Current Linearity 500 µA < LIN < 1000 µA; RLOAD = 10Ω Channels Read, 3 and 4 –3.5 2.5 +3.5 % ILIN-2 Output Current Linearity 500 µA < LIN < 1000 µA; RLOAD = 10Ω Channels 2 –8 5 +8 % IOUTW Output Current Channel 2 (Note 12) @ 1mA Input Current 250 263 mA IOUTR,3,4 Output Current Channel 3, 4 and Read (Note 12) @ 1 mA Input Current 135 150 mA All Channels (Note 14); RLOAD = 5Ω 500 IOUTTOTAL Total Output Current mA VTLO TTL Low Voltage ENR, ENOSC Input (H to L) 1.51 0.8 VELO Enable Low Voltage Enable Input (H to L) 2.41 0.8 VTHI TTL High Voltage ENR, ENOSC Inputs (L to H ) 2.0 VEHI Enable High Voltage Enable Input (L to H) 2.8 ISPD Supply Current, Power Down Enable = Low (Note 12) 0.003 0.5 mA ISr1 Supply Current, Read Mode, Oscillator Disabled ENOSC = Low; (Note 12) I2 = I3 = I4 = IR = 125 µA 98.5 120 mA ISr2 Supply Current, Read Mode, Oscillator Enabled ENOSC = High; (Note 12) I2 = I3 = I4 = IR = 125 µA 98.5 120 mA www.national.com 2 1.54 V V V 2.4 V (Continued) Unless otherwise specified, all limits guaranteed for TJ = 25˚C, RL = 10Ω. Boldface limits apply at the temperature extremes. (Note 8) Symbol Parameter Conditions ISwr Supply Current, Write Mode EN2 = EN3 = EN4 = High; (Note 12) I2 = I3 = I4 = IR = 125 µA IS Supply Current All Channels Disable, No Input Current. SELB = 0; RAA, RAB, RFA, RFB = ∞ Min (Note 7) Typ (Note 6) Max (Note 7) Units 182.5 210 mA 45 mA +5V AC Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C, RL = 10Ω. Boldface limits apply at the temperature extremes. (Note 8) Symbol Parameter Conditions Min (Note 7) Typ (Note 6) Max (Note 7) Units tr Write Rise Time IOUT = 40 mA (Read) + 40 mA (10% to 90%) RLOAD = 5Ω 0.50 ns tf Write Fall Time IOUT = 40 mA (Read) + 40 mA (90% to 10%) RLOAD = 5Ω 0.76 ns tr Write Rise Time IOUT = 100 mA (Read) + 100 mA (10% to 90%) RLOAD = 5Ω 0.65 ns tf Write Fall Time IOUT = 100 mA (Read) + 100 mA (90% to 10%) RLOAD = 5Ω 0.75 ns tr Write Rise Time IOUT = 150 mA (Read) + 150 mA (10% to 90%) RLOAD = 5Ω 0.78 ns tf Write Fall Time IOUT = 150 mA (Read) + 150 mA (90% to 10%) RLOAD = 5Ω 0.77 ns OS Output Current Overshoot IOUT = 40 mA (Read) + 40 mA 16 % IN0 Output Current Noise IOUT = 40 mA; RLOAD = 50Ω; f = 10 MHz; ENOSC = Low 0.47 nA/ tON IOUT ON Prop. Delay Switched on EN2 and EN2B 0.45 tOFF IOUT OFF Prop. Delay Switched on EN2 and EN2B 0.40 ns ns tdisr Disable Time, Read Channel Switch on ENR 1.1 ns tenr Enable Time, Read Channel Switch on ENR 1.1 ns tdis Disable Time, (Shutdown) 3 µs ten Enable Time, (Shutdown) 3 µs BWC Channel Bandwidth, –3 dB IOUT = 50 mA, All Channels fOSC Oscillator Frequency RF = 3 kΩ Range 200 MHz to 600 MHz TDO Disable Time Oscillator 5.2 ns TEO Enable Time Oscillator 5.4 ns 2.5 270 330 MHz 390 MHz Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation. Note 2: For testing purposes, ESD was applied using ‘Human body model’; 1.5 kΩ in series with 100 pF Note 3: Machine Model, 0Ω in series with 200 pF. Note 4: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the maximum allowed junction temperature of 150˚C Note 5: The maximum power dissipation is a function of TJ(MAX, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) -TA) /θJA. All numbers apply for packages soldered directly onto a PC board. Note 6: Typical values represent the most likely parametric norm. Note 7: All limits are guaranteed by testing or statistical analysis. Note 8: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. There is no guarantee of parametric performance as indicated in the electrical tables under conditions of internal self-heating where TJ > TA. See Applications section for information on temperature de-rating of this device. Note 9: VGPD = ground potential difference voltage between driver and receiver 3 www.national.com LMH6533 +5V DC Electrical Characteristics LMH6533 Note 10: This figure is taken from a thermal modeling result. The test board is a 4 layer FR-4 board measuring 101 mm x 101 mm x 1.6 mm with a 3 x 3 array of thermal vias. The ground plane on the board is 50 mm x 50 mm. Ambient temperature in simulation is 22˚C, still air. Power dissipation is 1W. Note 11: Reference IEEE Reduced Range Link (RRL) specifications. Note 12: Positive current corresponds to current flowing into the device. Note 13: Input currents are set to 0.3 mA Note 14: Total input current is 4.4 mA (all 4 channels equal) and output currents are summed together (see typical performance characteristics). Connection Diagram 28-Pin LLP 20027702 Top View Ordering Information Package 28-Pin LLP Part Number Package Marking LMH6533SP NOPB LMH6533SP LMH6533SPX NOPB www.national.com Transport Media NSC Drawing 1k Units Tape and Reel SPA28A 4.5k Units Tape and Reel 4 LMH6533 Pin Description Pin # Description Remark 1 Laser driver output channel A 2 Internal Oscillator Enable pin Oscillator activated if pin is high 3 Temp Sensing Diode See application note on using this pin 4 Read Channel Enable pin Read Channel Enabled if pin is high 5 Chip Enable pin Chip Enabled if pin is high 6 Supply Voltage A 7 Ground Connection A 8 Read Channel current setting 9 Channel 2 current setting 10 Channel 3 current setting 11 Channel 4 current setting 12 Oscillator Frequency setting Channel A Set by external resistor to ground 13 Oscillator Frequency setting Channel B Set by external resistor to ground 14 Oscillator Amplitude setting Channel A Set by external resistor to ground 15 Oscillator Amplitude setting Channel B Set by external resistor to ground 16 Channel select B Channel B selected if pin is high 17 LVDS input Channel 2B Channel 2 active if logical input is low 18 LVDS input Channel 2 Channel 2 active if logical input is high 19 LVDS input Channel 3B Channel 3 active if logical input is low 20 LVDS input Channel 3 Channel 3 active if logical input is high 21 LVDS input Channel 4B Channel 4 active if logical input is low 22 LVDS input Channel 4 Channel 4 active if logical input is high 23 NC 24 Supply Voltage 25 Supply Voltage 26 Supply Voltage 27 Laser driver output channel B 28 Ground Connection B Truth Tables IOUT CONTROL Enable ENR EN2 EN3 EN4 0 X X X X IOUT OFF 1 0 0 0 0 OFF 1 1 0 0 0 AR*IINR 1 1 1 0 0 AR*IINR+A2*IIN2 1 1 0 1 0 AR*IINR+A3*IIN3 1 1 0 0 1 AR*IINR+A4*IIN4 OSCILLATOR CONTROL Enable ENOSC ENR EN2 EN3 EN4 0 x x x x x OFF 1 0 x x x x OFF 1 1 x x x x on 5 Oscillator www.national.com LMH6533 Waveforms 20027703 Functional Timing Diagram 20027704 Enable Timing 20027705 Read Timing 20027706 Write Timing www.national.com 6 LMH6533 Waveforms (Continued) 20027707 Oscillator Timing 7 www.national.com LMH6533 Detailed Block Diagram 20027708 www.national.com 8 LMH6533 Application Schematic 20027709 9 www.national.com LMH6533 Typical Performance Characteristics At TJ = 25˚C; V+ = +5V; V− = −50V; Unless otherwise speci- fied. Oscillator Frequency vs. RF Oscillator Amplitude vs. RA 20027711 20027710 Headroom & Output Current vs. Total Input Current Pulse Response 20027719 20027720 Noise vs. Frequency 20027721 www.national.com 10 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. 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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. LMH6533 Four –Channel Laser Diode Driver with Dual Output, LVDS Interface and HFM Oscillator Physical Dimensions