ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 1/19 FEATURES APPLICATIONS ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Pump lasers ♦ Laser projection ♦ Laser TV ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Six channel laser switch from CW up to 200 MHz CW operation with up to 500 mA per channel Spike-free switching of the laser current 6 x 1 channels with TTL inputs 3 x 2 channels with LVDS inputs Operates as six independent voltage-controlled current sinks Switching outputs (LDKx) are 12 V capable for blue laser diodes Fast and slow switching mode Simple current control at pins CIx CIx voltage < 3 V for full current Wide supply voltage range from 3 to 5.5 V All channels can be paralleled for 3 A operation Multiple iC-HG can be connected in parallel for higher currents Open drain error output Thermal shutdown PACKAGES QFN28 5 mm x 5 mm BLOCK DIAGRAM VDD iC-HG LDK1 CI1 EN1 & AGND1 + LDK2 - CI2 EN2 & AGND2 CI3 LDK3 EN3 AGND3 CI4 LDK4 EN4 AGND4 CI5 LDK5 EN5 AGND5 CI6 LDK6 EN6 AGND6 VDD NER ELVDS 60% & 80% 40% Power & Temperature Monitor 20% GND Copyright © 2010 iC-Haus http://www.ichaus.com iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 2/19 DESCRIPTION Six channel Laser Switch iC-HG enables the spikefree switching of laser diodes with well-defined current pulses at frequencies ranging from DC to 200 MHz. The diode current is determined by the voltages at pins CIx. The six fast switches are controlled independently via TTL inputs. Input ELVDS = hi selects LVDS type inputs and three channel mode. TTL slow switch mode is selected with 30% VDD and LVDS slow switch mode with 70% VDD at input ELVDS. The laser diode can thus be turned on and off or switched between different current levels (LDKx connected) defined by the voltages at CIx. Each channel can be operated up to 500 mA DC current depending on the heat dissipation. The integrated thermal shutdown feature protects the iC-HG from damage by excessive temperature. ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 3/19 PACKAGES QFN28 5 mm x 5 mm to JEDEC PIN CONFIGURATION QFN28 5 mm x 5 mm 28 27 26 25 24 23 PIN FUNCTIONS No. Name Function 22 1 21 2 20 3 19 HG code... ... 4 5 6 18 17 16 15 7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 CI1 CI2 CI3 GND CI4 CI5 CI6 AGND6 LDK6 AGND5 LDK5 AGND4 LDK4 EN6 15 EN5 8 9 10 11 12 13 14 16 EN4 17 EN3 18 VDD 19 ELVDS 20 EN2 21 EN1 22 23 24 25 26 27 28 NER LDK3 AGND3 LDK2 AGND2 LDK1 AGND1 Current control voltage channel 1 Current control voltage channel 2 Current control voltage channel 3 Ground Current control voltage channel 4 Current control voltage channel 5 Current control voltage channel 6 Analog ground channel 6 Laser diode cathode channel 6 Analog ground channel 5 Laser diode cathode channel 5 Analog ground channel 4 Laser diode cathode channel 4 TTL switching input channel 6 Negative LVDS Input channel 5 and 6 TTL switching input channel 5 Positive LVDS Input channel 5 and 6 TTL switching input channel 4 Negative LVDS Input channel 3 and 4 TTL switching input channel 3 Positive LVDS Input channel 3 and 4 Supply voltage TTL/LVDS Fast/Slow Input selector TTL switching input channel 2 Negative LVDS Input channel 1 and 2 TTL switching input channel 1 Positive LVDS Input channel 1 and 2 Error monitor output Laser diode cathode channel 3 Analog ground channel 3 Laser diode cathode channel 2 Analog ground channel 2 Laser diode cathode channel 1 Analog ground channel 1 The Thermal Pad is to be connected to a Ground Plane (GND, AGND1. . . 6) on the PCB. Only pin 1 marking on top or bottom defines the package orientation ( HG label and coding is subject to change). ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 4/19 ABSOLUTE MAXIMUM RATINGS Beyond these values damage may occur; device operation is not guaranteed. Item No. Symbol Parameter Conditions Unit Min. Max. G001 VDD Voltage at VDD -0.3 6 V G002 I(VDD) Current in VDD -10 750 mA G003 V(CI) Voltage at CI1. . . 6 -0.3 6 V G004 V() Voltage at EN1. . . 6, AGND1. . . 6, ELVDS, NER -0.3 6 V G005 V(LDK) Voltage at LDK1. . . 6 -0.3 12 V G006 I(LDK) Current in LDK1. . . 6 DC current -10 600 mA G007 I(AGND) Current in AGND1. . . 6 DC current -600 10 mA G008 I() Current in CI1. . . 6, EN1. . . 6, ELVDS -10 10 mA G009 I(NER) Current in NER -10 20 mA G010 Vd() ESD Susceptibility at all pins 2 kV G011 Tj Operating Junction Temperature -40 125 °C G012 Ts Storage Temperature Range -40 150 °C HBM 100 pF discharged through 1.5 k Ω THERMAL DATA Item No. Symbol Parameter Conditions Unit Min. T01 Ta Operating Ambient Temperature Range (extended range on request) T02 Rthja Thermal Resistance Chip/Ambient All voltages are referenced to ground unless otherwise stated. All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative. Typ. -25 Max. 85 tbd °C K/W ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 5/19 ELECTRICAL CHARACTERISTICS Operating Conditions: VDD = 3.0...5.5 V, AGND1. . . 6 = GND, Tj = -25...125 °C unless otherwise stated Item No. Symbol Parameter Conditions Unit Min. Typ. Max. Total Device (x = 1. . . 6) 001 002 VDD Permissible Supply Voltage I(VDD) Supply Current in VDD 3 CW operation ELVDS = GND ELVDS = 30% VDD ELVDS = 70% VDD ELVDS = VDD pulsed operation, f(ENx) = 200 MHz 5.5 V tbd tbd tbd tbd mA mA mA mA 003 I(VDD) Supply Current in VDD 700 mA 004 V(LDKx) Permissible Voltage at LDKx -0.3 12 V 005 V(NER) Permissible Voltage at NER -0.3 5.5 V 006 Vc()hi Clamp Voltage hi at LDKx I(LDK) = 10 mA 12.1 18 V 007 Vc(NER) Clamp Voltage hi at NER I(NER) = 1 mA 7 18 V 008 Vc(CIx)hi Clamp Voltage hi at CIx Vc(CIx) = V(CIx) − VDD; I(CI) = 10 mA, other pins open 0.3 1.6 V 009 Vc()hi Clamp Voltage hi at ENx, ELVDS Vc() = V() − VDD; I() = 1 mA, other pins open 0.8 3 V 010 Vc()lo Clamp Voltage lo at VDD, LDKx, I() = -10 mA, other pins open CIx, ENx, AGNDx, ELVDS, NER -1.6 -0.3 V 500 mA 15 Laser Control LDK1. . . 6, CI1. . . 6 (x = 1. . . 6) 101 Icw(LDKx) Permissible CW Current in LDKx (per channel) 102 Vs(LDKx) Saturation Voltage at LDKx I(LDKx) = 450 mA, V(CIx) = V(CIx)@I(LDKx) = 500 mA 1.5 V 103 I0(LDKx) Leakage Current in LDKx ENx = lo, V(LDKx) = 12 V 100 µA 104 tr() LDKx Current Rise Time Fast Iop(LDKx) = 500 mA, I(LDKx): 10% → 90% Iop, V(ELVDS) = 0 V or VDD 1 ns 105 tf() LDKx Current Fall Time Fast Iop(LDKx) = 500 mA, I(LDKx): 90% → 10% Iop, V(ELVDS) = 0 V or VDD 1 ns 106 tr() LDKx Current Rise Time Slow Iop(LDKx) = 500 mA, I(LDKx): 10% → 90% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 5 V 5 10 40 ns 107 tf() LDKx Current Fall Time Slow Iop(LDKx) = 500 mA, I(LDKx): 90% → 10% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 5 V 5 10 40 ns 108 tr() LDKx Current Rise Time Slow Iop(LDKx) = 500 mA, I(LDKx): 10% → 90% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 3.3 V 10 30 90 ns 109 tf() LDKx Current Fall Time Slow Iop(LDKx) = 500 mA, I(LDKx): 90% → 10% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 3.3 V 10 30 90 ns 110 tp() Propagation Delay Fast V(ENx) → I(LDKx) V(ELVDS) = 0 V or VDD, Differential LVDS Rise and Fall Time < 0.5 ns 3 5 14 ns 111 CR() Current Matching all Channels 112 V(CIx) Permissible Voltage at CIx 113 Vt(CIx) Threshold Voltage at CIx I(LDKx) < 5 mA 114 V(CIx) Operating Voltage at CIx I(LDKx) = 500 mA, V(LDKx) > 1.8 V 115 Ipd(CIx) Pull-Down Current at CIx V(CIx) = 0.5. . . 5.5 V 116 C(CIx) Capacity at CIx 117 Vc(LDKx) Clamp Voltage at LDKx 0.9 1.1 -0.3 VDD V 0.5 1.2 V 2 2.9 V 1 2.5 5 µA V(CIx) = 2 V 500 635 760 pF I(LDKx) = 100 mA, tclamp < 1 ms, tclamp/T < 1:100 12.5 20 V ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 6/19 ELECTRICAL CHARACTERISTICS Operating Conditions: VDD = 3.0...5.5 V, AGND1. . . 6 = GND, Tj = -25...125 °C unless otherwise stated Item No. Symbol Parameter Conditions Unit Min. Typ. Max. Input EN1. . . 6 (x = 1. . . 6) 201 Vt(TTL)hi Input Threshold Voltage hi V(ELVDS) < 35% VDD, TTL 202 Vt(TTL)lo Input Threshold Voltage lo V(ELVDS) < 35% VDD, TTL 0.8 2 V 203 Vhys(TTL) Hysteresis Vhys() = Vt()hi − Vt()lo; V(ELVDS) < 35% VDD, TTL 50 mV 204 I(ENx) Pulldown Current V(ELVDS) < 35% VDD, V() = 0.8 V. . . VDD, TTL 4 205 R(ENx) Differential Input Impedance at ENx V(ELVDS) > 65% VDD, V(ENx) < VDD − 1.4 V, LVDS 14 206 Vdiff Differential Voltage Vdiff = |V(EN1,3,5) − V(EN2,4,6)|; V(ELVDS) > 65% VDD, LVDS 200 207 V() Input Voltage Range V(ELVDS) > 65% VDD, LVDS 0.6 ELVDS open 48 30 V 80 µA 28 kΩ mV VDD − 1.4 V 50 52 %VDD Input ELVDS 301 V(ELVDS) Voltage at ELVDS 302 Ri(ELVDS) 35 50 70 kΩ 303 Vt(ELVDS) Threshold Voltage TTL Fast to TTL Slow 16 20 24 %VDD 304 Vt(ELVDS) Threshold Voltage TTL Slow to Error 36 40 44 %VDD 305 Vt(ELVDS) Threshold Voltage Error to LVDS Slow 56 60 64 %VDD 306 Vt(ELVDS) Threshold Voltage LVDS Slow to LVDS Fast 74 80 84 %VDD 307 Vhys() 10 25 50 mV 3 9 Hysteresis Ouput NER 401 Vsat(NER) Saturation Voltage at NER ELVDS open, I(NER) = 2 mA 402 I(NER) Current in NER ELVDS open, V(NER) > 0.6 V 0.6 V 20 mA Overtemperature 501 Toff Overtemperature Shutdown rising temperature 130 170 °C 502 Ton Overtemperature Release falling temperature 120 160 °C 503 Thys Hysteresis Toff − Ton 5 °C Power On 601 VON Power On Voltage VDD rising voltage 602 VOFF Power Down Voltage VDD falling voltage 603 Vhys Hysteresis 2.9 V 500 mV 1.5 50 V ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 7/19 CONFIGURATION INPUT ELVDS Pin ELVDS selects between 6 channel TTL mode or 3 channel LVDS mode and chooses slow or fast switching speed. The unconnected pin ELVDS is an error condition signaled at pin NER with the laser current disabled. Pin ELVDS connected to GND selects the six channel fast TTL mode. Pin ELVDS connected to 30% VDD selects the six channel slow TTL mode. Pin ELVDS connected to 70% VDD selects the three channel slow LVDS mode. Pin ELVDS connected to VDD selects the three channel fast LVDS mode. An easy way to set the slow operation mode for TTL and LVDS mode is to connect a voltage divider at pin ELVDS. Figure 1 shows the recommended voltage divider for slow TTL mode and Figure 2 shows the recommended voltage divider for slow LVDS mode. Figure 1: TTL Slow Figure 2: LVDS Slow DIGITAL INPUTS EN1. . . 6 EN1. . . 6 are the digital switching inputs. With pin ELVDS set to 6 channel TTL mode, each pin ENx enables the current sink at the respective LDKx. With pin ELVDS set to 3 channel LVDS mode, the odd ENx pins are the positive and the even ENx pins are the negative LVDS inputs. EN1 and EN2 control LDK1 and LDK2, EN3 and EN4 control LDK3 and LDK4 and EN5 and EN6 control LDK5 and LDK6. For correct LVDS operation 100 Ω terminating resistors between the respective EPx and ENx pins, very close to the inputs, are strongly recommended. Input pins from unused channels have to be connected to GND (TTL operation) resp. EPx to GND and ENx to VDD (LVDS operation). ANALOG CURRENT CONTROL VOLTAGE INPUTS CI1. . . 6 The Voltage at pins CI1. . . 6 set the current value at pins LDK1. . . 6. The figures 3 and 4 shows the temperature dependency of the current at LDK versus the Voltage at CI. The figures 5 and 6 shows the min., typ. and max. variations between devices. iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 8/19 Figure 3: I(LDK) vs. V(CI) at VDD = 5 V Figure 4: I(LDK) vs. V(CI) at VDD = 3.3 V iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 9/19 Figure 5: I(LDK) vs. V(CI) at VDD = 5 V and TJ = 27 °C Figure 6: I(LDK) vs. V(CI) at VDD = 3.3 V and TJ = 27 °C iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 10/19 LASER OUTPUTS LDK1. . . 6 LDK1. . . 6 are the current pins for the laser diode cathode. For high speed operation connect the laser diode as close as possible to this pins to minimize the induc- tance. It may still be necessary though to use an RC snubber network for damping LC oscillations. ANALOG GROUNDS AGND1. . . 6 AGND1. . . 6 are the ground pins for the channels. It is recommended to connect all AGND1. . . 6 pins to GND. ERROR OUTPUT NER The open drain NER pin is a low-active error output. Signalled errors are ELVDS open or at 50% VDD, VDD undervoltage and thermal shutdown. THERMAL SHUTDOWN iC-HG is protected by an integrated thermal shutdown feature. When the shutdown temperature is reached all channels are disabled. Falling temperature after this shutdown will unconditionally enable all channels again. Necessary precaution to prevent damage of the laser may be to also disable any external control circuits for the laser output power power or current control during thermal shutdown. The error signal at pin NER can be used to e.g. disable the control circuit. ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 11/19 APPLICATION EXAMPLES ..12V CLDA1 100μF CLDA2 10μF CLDA3 100nF CLDA4 10nF 3..5.5V CVDD1 10μF VDD CVDD2 100nF CVDD3 10nF iC-HG LDK1 CI1 EN1 EN+LVDS & AGND1 + EN-LVDS CI CI 10nF LDK2 - CI2 EN2 & AGND2 CI3 LDK3 EN3 AGND3 CI4 LDK4 EN4 AGND4 CI5 LDK5 EN5 AGND5 CI6 LDK6 EN6 AGND6 RNER 10K NER VDD 80% ELVDS 60% & RLVDS 100 40% Power & Temperature Monitor 20% GND Figure 7: 1 channel LVDS fast NERROR ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 12/19 ..12V CLDA1 100μF CLDA2 10μF CLDA3 100nF CLDA4 10nF 3..5.5V CVDD1 10μF VDD CVDD2 100nF CVDD3 10nF iC-HG LDK1 CI1 EN1 EN+LVDS & AGND1 + RLVDS 100 LDK2 - CI2 EN2 EN-LVDS & AGND2 CI3 CI CI 10nF LDK3 EN3 AGND3 CI4 LDK4 EN4 AGND4 CI5 LDK5 EN5 AGND5 CI6 LDK6 EN6 AGND6 RNER 10K NER VDD RELVDS1 3.32k ELVDS RELVDS2 7.5k 60% & 80% 40% Power & Temperature Monitor 20% GND Figure 8: 1 channel LVDS slow NERROR ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 13/19 ..12V CLDA1 100μF CLDA2 10μF CLDA3 100nF CLDA4 10nF 3..5.5V CVDD1 10μF VDD CVDD2 100nF CVDD3 10nF iC-HG LDK1 CI1 ENTTL EN1 & AGND1 + LDK2 - CI2 EN2 CI 10nF AGND2 CI3 LDK3 EN3 AGND3 CI4 LDK4 EN4 AGND4 CI5 LDK5 EN5 AGND5 CI6 LDK6 EN6 AGND6 RNER 10K NER VDD 80% ELVDS 60% & CI & 40% Power & Temperature Monitor 20% GND Figure 9: 1 channel TTL fast NERROR ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 14/19 ..12V CLDA1 100μF CLDA2 10μF CLDA3 100nF CLDA4 10nF 3..5.5V CVDD1 10μF VDD CVDD2 100nF CVDD3 10nF iC-HG LDK1 CI1 EN1 ENTTL & AGND1 + LDK2 - CI2 EN2 & AGND2 CI3 CI CI 10nF LDK3 EN3 AGND3 CI4 LDK4 EN4 AGND4 CI5 LDK5 EN5 AGND5 CI6 LDK6 EN6 AGND6 RNER 10K NER VDD RELVDS1 7.5k ELVDS RELVDS2 3.32k 60% & 80% 40% Power & Temperature Monitor 20% GND Figure 10: 1 channel TTL slow NERROR ar y n i im prel iC-HG 3 A LASER SWITCH Rev A1, Page 15/19 ..12V CLDA1 100μF CLDA2 10μF CLDA3 100nF CLDA4 10nF 3..5.5V CVDD1 10μF VDD CVDD2 100nF CVDD3 10nF iC-HG LD1 LDK1 CI1 CI1 EN1 EN+LVDS1 & AGND1 + RLVDS1 100 LDK2 - CI2 EN2 EN-LVDS1 & CI1 10nF AGND2 LD2 CI3 CI2 LDK3 EN3 EN+LVDS2 AGND3 CI4 RLVDS2 100 LDK4 EN4 EN-LVDS2 AGND4 LD3 CI5 CI3 LDK5 EN5 EN+LVDS3 RLVDS3 100 LDK6 EN6 AGND6 RNER 10K CI3 10nF NER VDD 80% ELVDS 60% & EN-LVDS3 CI2 10nF AGND5 CI6 40% Power & Temperature Monitor 20% GND Figure 11: 3 channel LVDS fast NERROR Figure 12: 6 channel TTL fast ENTTL6 CI6 ENTTL5 CI1 10nF CI2 10nF CI3 10nF CI4 10nF CI5 10nF CVDD1 10μF CI6 10nF EN6 CI6 EN5 CI5 EN4 CI4 EN3 CI3 EN2 CI2 EN1 CI1 ELVDS CVDD2 100nF VDD 20% 40% 60% 80% - + iC-HG GND & & VDD CLDA1 100μF Power & Temperature Monitor CLDA2 10μF NER AGND6 LDK6 AGND5 LDK5 AGND4 LDK4 AGND3 LDK3 AGND2 LDK2 AGND1 LDK1 CVDD3 10nF CLDA3 100nF CLDA4 10nF NERROR RNER 10K LD1 LD2 LD3 LD4 LD5 LD6 3 A LASER SWITCH CI5 ENTTL4 CI4 ENTTL3 CI3 ENTTL2 CI2 ENTTL1 CI1 3..5.5V & ..12V iC-HG ar y n i im prel Rev A1, Page 16/19 iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 17/19 EVALUATION BOARD iC-HG comes with an evaluation board for test purpose. Figures 13 and 14 show both the schematic and the component side of the evaluation board. Figure 13: Schematic of the evaluation board iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 18/19 Figure 14: Evaluation board (component side) iC-Haus expressly reserves the right to change its products and/or specifications. An Infoletter gives details as to any amendments and additions made to the relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by email. Copying – even as an excerpt – is only permitted with iC-Haus approval in writing and precise reference to source. iC-Haus does not warrant the accuracy, completeness or timeliness of the specification on this site and does not assume liability for any errors or omissions in the materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of the product. iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in Hanover (Hannover-Messe). We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to. iC-HG 3 A LASER SWITCH ar y n i im prel Rev A1, Page 19/19 ORDERING INFORMATION Type Package Order Designation iC-HG QFN28 5 mm x 5 mm Evaluation Board iC-HG QFN28 iC-HG EVAL HG1D For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Tel.: +49 (61 35) 92 92-0 Fax: +49 (61 35) 92 92-192 Web: http://www.ichaus.com E-Mail: [email protected] Appointed local distributors: http://www.ichaus.com/sales_partners