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IC-HG
3 A LASER SWITCH
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Rev A1, Page 1/19 APPLICATIONS o Pump lasers o Laser projection o Laser TV
FEATURES o o o o o o o o o o o o o o o 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 CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6
VDD
&
AGND2 LDK3 AGND3 LDK4 AGND4 LDK5 AGND5 LDK6 AGND6 NER
80% 60% 40% 20%
ELVDS
&
Power & Temperature Monitor
GND
Copyright (c) 2010 iC-Haus
http://www.ichaus.com
IC-HG
3 A LASER SWITCH
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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.
IC-HG
3 A LASER SWITCH
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PACKAGES QFN28 5 mm x 5 mm to JEDEC PIN CONFIGURATION QFN28 5 mm x 5 mm PIN FUNCTIONS No. Name Function 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 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
28
27
26
25
24
23
22
1 2 3 4 5 6 7
21 20 19
HG code... ...
18 17 16 15
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
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).
IC-HG
3 A LASER SWITCH
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ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed. Item No. Symbol Parameter Voltage at VDD Current in VDD Voltage at CI1. . . 6 Voltage at EN1. . . 6, AGND1. . . 6, ELVDS, NER Voltage at LDK1. . . 6 Current in LDK1. . . 6 Current in AGND1. . . 6 Current in CI1. . . 6, EN1. . . 6, ELVDS Current in NER ESD Susceptibility at all pins Operating Junction Temperature Storage Temperature Range HBM 100 pF discharged through 1.5 k -40 -40 DC current DC current Conditions Min. -0.3 -10 -0.3 -0.3 -0.3 -10 -600 -10 -10 Max. 6 750 6 6 12 600 10 10 20 2 125 150 V mA V V V mA mA mA mA kV C C Unit
G001 VDD G002 I(VDD) G003 V(CI) G004 V() G005 V(LDK) G006 I(LDK) G007 I(AGND) G008 I() G009 I(NER) G010 Vd() G011 Tj G012 Ts
THERMAL DATA
Item No. T01 T02 Symbol Ta Rthja Parameter Operating Ambient Temperature Range (extended range on request) Thermal Resistance Chip/Ambient Conditions Min. -25 tbd Typ. Max. 85 C K/W Unit
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.
IC-HG
3 A LASER SWITCH
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ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3.0...5.5 V, AGND1. . . 6 = GND, Tj = -25...125 C unless otherwise stated Item No. 001 002 Symbol Parameter Conditions Min. VDD I(VDD) Permissible Supply Voltage Supply Current in VDD CW operation ELVDS = GND ELVDS = 30% VDD ELVDS = 70% VDD ELVDS = VDD pulsed operation, f(ENx) = 200 MHz -0.3 -0.3 I(LDK) = 10 mA I(NER) = 1 mA Vc(CIx) = V(CIx) - VDD; I(CI) = 10 mA, other pins open 12.1 7 0.3 0.8 -1.6 15 3 Typ. Max. 5.5 tbd tbd tbd tbd 700 12 5.5 18 18 1.6 3 -0.3 V mA mA mA mA mA V V V V V V V Unit
Total Device (x = 1. . . 6)
003 004 005 006 007 008 009 010
I(VDD) V(LDKx) V(NER) Vc()hi Vc(NER) Vc(CIx)hi Vc()hi Vc()lo
Supply Current in VDD Permissible Voltage at LDKx Permissible Voltage at NER Clamp Voltage hi at LDKx Clamp Voltage hi at NER Clamp Voltage hi at CIx
Clamp Voltage hi at ENx, ELVDS Vc() = V() - VDD; I() = 1 mA, other pins open Clamp Voltage lo at VDD, LDKx, I() = -10 mA, other pins open CIx, ENx, AGNDx, ELVDS, NER
Laser Control LDK1. . . 6, CI1. . . 6 (x = 1. . . 6) 101 102 103 104 105 106 107 108 Icw(LDKx) Permissible CW Current in LDKx (per channel) Vs(LDKx) I0(LDKx) tr() tf() tr() tf() tr() Saturation Voltage at LDKx Leakage Current in LDKx LDKx Current Rise Time Fast LDKx Current Fall Time Fast LDKx Current Rise Time Slow LDKx Current Fall Time Slow LDKx Current Rise Time Slow I(LDKx) = 450 mA, V(CIx) = V(CIx)@I(LDKx) = 500 mA ENx = lo, V(LDKx) = 12 V Iop(LDKx) = 500 mA, I(LDKx): 10% 90% Iop, V(ELVDS) = 0 V or VDD Iop(LDKx) = 500 mA, I(LDKx): 90% 10% Iop, V(ELVDS) = 0 V or VDD Iop(LDKx) = 500 mA, I(LDKx): 10% 90% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 5 V Iop(LDKx) = 500 mA, I(LDKx): 90% 10% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 5 V Iop(LDKx) = 500 mA, I(LDKx): 10% 90% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 3.3 V Iop(LDKx) = 500 mA, I(LDKx): 90% 10% Iop, V(ELVDS) = 30% VDD or 70% VDD, VDD = 3.3 V V(ELVDS) = 0 V or VDD, Differential LVDS Rise and Fall Time < 0.5 ns 5 5 10 10 10 30 500 1.5 100 1 1 40 40 90 mA V A ns ns ns ns ns
109
tf()
LDKx Current Fall Time Slow
10
30
90
ns
110 111 112 113 114 115 116 117
tp() CR() V(CIx) Vt(CIx) V(CIx) Ipd(CIx) C(CIx) Vc(LDKx)
Propagation Delay Fast V(ENx) I(LDKx) Current Matching all Channels Permissible Voltage at CIx Threshold Voltage at CIx Operating Voltage at CIx Pull-Down Current at CIx Capacity at CIx Clamp Voltage at LDKx
3 0.9 -0.3
5
14 1.1 VDD 1.2
ns
V V V A pF V
I(LDKx) < 5 mA I(LDKx) = 500 mA, V(LDKx) > 1.8 V V(CIx) = 0.5. . . 5.5 V V(CIx) = 2 V I(LDKx) = 100 mA, tclamp < 1 ms, tclamp/T < 1:100
0.5 2 1 500 12.5 2.5 635
2.9 5 760 20
IC-HG
3 A LASER SWITCH
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ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3.0...5.5 V, AGND1. . . 6 = GND, Tj = -25...125 C unless otherwise stated Item No. 201 202 203 204 205 206 207 Symbol Parameter Conditions Min. Vt(TTL)hi Vt(TTL)lo Input Threshold Voltage hi Input Threshold Voltage lo V(ELVDS) < 35% VDD, TTL V(ELVDS) < 35% VDD, TTL Vhys() = Vt()hi - Vt()lo; V(ELVDS) < 35% VDD, TTL V(ELVDS) < 35% VDD, V() = 0.8 V. . . VDD, TTL V(ELVDS) > 65% VDD, V(ENx) < VDD - 1.4 V, LVDS Vdiff = |V(EN1,3,5) - V(EN2,4,6)|; V(ELVDS) > 65% VDD, LVDS V(ELVDS) > 65% VDD, LVDS 0.8 50 4 14 200 0.6 VDD - 1.4 50 50 20 40 60 80 25 52 70 24 44 64 84 50 0.6 3 130 120 5 2.9 1.5 50 500 9 20 170 160 30 80 28 Typ. Max. 2 V V mV A k mV V Unit
Input EN1. . . 6 (x = 1. . . 6)
Vhys(TTL) Hysteresis I(ENx) R(ENx) Vdiff V() Pulldown Current Differential Input Impedance at ENx Differential Voltage Input Voltage Range
Input ELVDS 301 302 303 304 305 306 307 401 402 501 502 503 601 602 603 V(ELVDS) Voltage at ELVDS Ri(ELVDS) Vt(ELVDS) Threshold Voltage TTL Fast to TTL Slow Vt(ELVDS) Threshold Voltage TTL Slow to Error Vt(ELVDS) Threshold Voltage Error to LVDS Slow Vt(ELVDS) Threshold Voltage LVDS Slow to LVDS Fast Vhys() Hysteresis ELVDS open, I(NER) = 2 mA ELVDS open, V(NER) > 0.6 V rising temperature falling temperature Toff - Ton rising voltage falling voltage ELVDS open 48 35 16 36 56 74 10 %VDD k %VDD %VDD %VDD %VDD mV V mA C C C V V mV
Ouput NER Vsat(NER) Saturation Voltage at NER I(NER) Toff Ton Thys VON VOFF Vhys Current in NER Overtemperature Shutdown Overtemperature Release Hysteresis Power On Voltage VDD Power Down Voltage VDD Hysteresis
Overtemperature
Power On
IC-HG
3 A LASER SWITCH
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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 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
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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
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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
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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 inductance. 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.
IC-HG
3 A LASER SWITCH
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APPLICATION EXAMPLES
..12V CLDA1 100F CLDA2 10F CLDA3 100nF CLDA4 10nF
3..5.5V CVDD1 10F
CVDD2
VDD
100nF
IC-HG
CI1 EN1
CVDD3 10nF
LDK1
EN+LVDS
& +
AGND1 LDK2
RLVDS 100
CI2 EN2
&
EN-LVDS
AGND2 LDK3 AGND3 LDK4 AGND4 LDK5 AGND5 LDK6 AGND6 RNER 10K
CI CI 10nF
CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6
VDD
80% 60% 40% 20%
NER
NERROR
&
ELVDS
Power & Temperature Monitor
GND
Figure 7: 1 channel LVDS fast
IC-HG
3 A LASER SWITCH
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CLDA3 100nF CLDA4 10nF
..12V CLDA1 100F CLDA2 10F
3..5.5V CVDD1 10F
CVDD2
VDD
100nF
IC-HG
CI1 EN1
CVDD3 10nF
LDK1
EN+LVDS
& +
AGND1 LDK2
RLVDS 100
CI2 EN2
&
EN-LVDS
AGND2 LDK3 AGND3 LDK4 AGND4 LDK5 AGND5 LDK6 AGND6 RNER 10K
CI CI 10nF
CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6
VDD
NER
80% 60% 40% 20%
NERROR
RELVDS1 3.32k ELVDS RELVDS2 7.5k
&
Power & Temperature Monitor
GND
Figure 8: 1 channel LVDS slow
IC-HG
3 A LASER SWITCH
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CLDA3 100nF CLDA4 10nF
..12V CLDA1 100F CLDA2 10F
3..5.5V CVDD1 10F CVDD2 100nF VDD
IC-HG
CI1 EN1
CVDD3 10nF
LDK1
ENTTL
& +
AGND1 LDK2
CI2 EN2
&
AGND2 LDK3 AGND3 LDK4 AGND4 LDK5 AGND5 LDK6 AGND6 RNER 10K
CI CI 10nF
CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6
VDD
80% 60% 40% 20%
NER
NERROR
&
ELVDS
Power & Temperature Monitor
GND
Figure 9: 1 channel TTL fast
IC-HG
3 A LASER SWITCH
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CLDA3 100nF CLDA4 10nF
..12V CLDA1 100F CLDA2 10F
3..5.5V CVDD1 10F
CVDD2
VDD
100nF
IC-HG
CI1 EN1
CVDD3 10nF
LDK1
ENTTL
& +
AGND1 LDK2
CI2 EN2
&
AGND2 LDK3 AGND3 LDK4 AGND4 LDK5 AGND5 LDK6 AGND6 RNER 10K
CI CI 10nF
CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6
VDD
NER
80% 60% 40% 20%
NERROR
RELVDS1 7.5k ELVDS RELVDS2 3.32k
&
Power & Temperature Monitor
GND
Figure 10: 1 channel TTL slow
IC-HG
3 A LASER SWITCH
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CLDA1 100F CLDA2 10F CLDA3 100nF CLDA4 10nF
..12V
3..5.5V CVDD1 10F
CVDD2
VDD
100nF
IC-HG
CI1 EN1
CVDD3 10nF LD1 LDK1
CI1 EN+LVDS1
& +
AGND1 LDK2
RLVDS1 100
CI2 EN2 CI1 10nF CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6 CI3 10nF
&
EN-LVDS1
AGND2 LD2 LDK3 AGND3 LDK4 AGND4 LD3 LDK5 AGND5 LDK6 AGND6 RNER 10K
CI2 EN+LVDS2 RLVDS2 100 EN-LVDS2 CI3 EN+LVDS3 RLVDS3 100 EN-LVDS3 CI2 10nF
VDD
80% 60% 40% 20%
NER
NERROR
&
ELVDS
Power & Temperature Monitor
GND
Figure 11: 3 channel LVDS fast
..12V CLDA1 100F CLDA2 10F CLDA3 100nF CLDA4 10nF
IC-HG
3..5.5V CVDD2 100nF VDD CVDD3 10nF LD1 LDK1
CVDD1 10F
IC-HG
CI1 EN1
3 A LASER SWITCH
CI1
ENTTL1 AGND1 LD2 LDK2
& +
CI2 EN2
CI2
&
AGND2 LDK3 AGND3 LDK4 AGND4 LDK5 AGND5 LDK6 AGND6 RNER 10K
VDD
80% 60% 40% 20%
ENTTL2
LD3
CI3 EN3 CI4 EN4 CI5 EN5 CI6 EN6 CI6 10nF
CI3
ENTTL3
LD4
CI4
ENTTL4
LD5
& &
Figure 12: 6 channel TTL fast
NER NERROR ELVDS
Power & Temperature Monitor
CI5
ENTTL5
LD6
CI6
ENTTL6
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CI1 10nF
CI2 10nF
CI3 10nF
CI4 10nF
CI5 10nF
Rev A1, Page 16/19
GND
IC-HG
3 A LASER SWITCH
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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
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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
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ORDERING INFORMATION
Type IC-HG
Package QFN28 5 mm x 5 mm Evaluation Board
Order Designation 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: sales@ichaus.com
Appointed local distributors: http://www.ichaus.com/sales_partners

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