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IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 1/8 FEATURES o o o o o o o o o o Laser switch for frequencies from CW up to 155 MHz Spike-free switching of the laser currents Three channels with independent current control at pins CIx Operates as a voltage-controlled current sink LVDS/TTL switching inputs with TTL monitor outputs Pulsed operation with up to 300 mA per channel CW operation with up to 65 mA per channel Laser current monitor output Thermal shutdown with open drain error output Protective ESD circuitry APPLICATIONS o Laser printers o Data transmission o Laser scanning devices
PACKAGES
QFN24 4 mm x 4 mm
BLOCK DIAGRAM
IMON LDK1 LDK2 LDKB VDD VTTL
CIB
IKB
IC-HB
CI2
IK2
1k LVDS/TTL
SYNB ENB EPB
1k
SYN2 EN2 EP2
CI1
LVDS/TTL
IK1
1k
SYN1 EN1 EP1
NER
LVDS/TTL
OVERTEMP SHUTDOWN
TTL AGND1 AGND2 AGNDB GND
Copyright (c) 2008 iC-Haus
http://www.ichaus.com
IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 2/8 DESCRIPTION Triple Laser Switch IC-HB enables the spike-free switching of laser diodes with well-defined current pulses at frequencies ranging from DC to 155 MHz. The diode current is determined by the voltages at pins CIx. The three fast switches are controlled independently via LVDS/TTL inputs. Input TTL = hi selects TTL type inputs. The laser diode can thus be turned on and off or switched between different current levels (LDKx connected) defined by the voltages at CI1, CI2 and CIB. Channel B is preferably used for biasing. For current monitoring purpose IMON sinks a fraction of the sum of currents into LDKx: I(IMON) = I(LDK1 ) + I(LDK2 ) I(LDKB ) + 92 75
Each channel can be operated at 65 mA DC (channel B: 60 mA) and up to 300 mA (channel B: 275 mA) pulsed current depending on the frequency, duty cycle and heat dissipation. The integrated thermal shutdown feature protects the IC from damage by excessive temperature.
PACKAGES QFN24 to JEDEC
PIN CONFIGURATION QFN24 4 mm x 4 mm
24
23
22
21
20
19
1
18
2
17
3
16
4
5
HB code... ...
15
14
6
13
7
8
9
10
11
12
PIN FUNCTIONS No. Name Function 1 AGND2 Analogue ground channel 2 2 LDK2 Laser diode cathode channel 2 3 LDKB Laser diode cathode channel B 4 AGNDB Analogue ground channel B 5 LDK1 Laser diode cathode channel 1 6 AGND1 Analogue ground channel 1
PIN FUNCTIONS No. Name Function 7 EP1 Positive LVDS/TTL switching input channel 1 8 EN1 Negative LVDS switching input channel 1 9 SYN1 Sync output channel 1 10 VTTL Sync TTL output supply voltage 11 SYNB Sync output channel B 12 CI1 Current control voltage channel 1 13 ENB Negative LVDS switching input channel B 14 EPB Positive LVDS/TTL switching input channel B 15 VDD +5 V supply voltage 16 GND Ground 17 CIB Current control voltage channel B 18 IMON Laser diode current monitor output 19 CI2 Current control voltage channel 2 20 NER Temperature shutdown monitor output 21 TTL TTL inputs selector (EPx) 22 SYN2 Sync output channel 2 23 EN2 Negative LVDS switching input channel 2 24 EP2 Positive LVDS/TTL switching input channel 2
For improved heat dissipation the thermal pad is to be connected to a ground plane on the PCB. Only pin 1 marking on top or bottom defines the package orientation ( HB label and coding is subject to change).
IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 3/8 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, CI2, CIB Current in LDK1, LDK2, LDKB Current in AGND1, AGND2, AGNDB Voltage at EN1, EN2, AGND1, AGND2, AGNDB Voltage at LDK1, LDK2, LDKB Susceptibility to ESD 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. -0.7 -10 -0.7 -10 -150 -0.7 -0.7 Max. 6 150 6 300 10 6 6 4 150 150 V mA V mA mA V V kV C C Unit
G001 VDD G002 I(VDD) G003 V(CIx) G004 I(LDKc) G005 I(AGND1) G006 V() G007 V(LDKx) G008 Vd() G009 Tj G010 Ts
THERMAL DATA
Operating Conditions: VDD = 3.5...5.5 V, VTTL = 3.15...5.5 V Item No. T01 T02 Symbol Ta Rthja Parameter Operating Ambient Temperature Range (extended range on request) Thermal Resistance Chip/Ambient soldered to PCB, therm. pad soldered to approx. 2 cm cooling area Conditions Min. -25 30 Typ. Max. 85 60 C K/W Unit
All voltages are referenced to ground unless otherwise stated. All currents into the device pins are positive; all currents out of the device pins are negative.
IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 4/8 ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3.5...5.5 V, VTTL = 3.15...5.5 V, Tj = -25...125 C unless otherwise stated Item No. 001 002 003 004 005 006 007 008 009 010 Symbol Parameter Conditions Min. VDD VTTL I(VDD) I(VDD) I(VTTL) V(LDKx) Vc(CIx)hi Vc()hi Permissible Supply Voltage Permissible Supply Voltage at VTTL Supply Current in VDD Supply Current in VDD Supply Current in VTTL Permissible Voltage at LDK1, LDK2, LDKB Clamp Voltage hi at CI1, CI2, CIB Vc(CIx) = V(CIx) - VDD, I(CIx) = 10 mA, other pins open Clamp Voltage hi at EN1, EN2, ENB, EP1, EP2, EPB, TTL Vc()hi = V() - VDD, I() = 0.1 mA, other pins open Vc(SYNx)hi = V(SYNx) - VTTL, I(EN) = 1 mA, other pins open I() = -10 mA, other pins open 0 0.4 0.4 0.4 -1.25 CW operation pulsed operation, f(ENx, EPx) = 150 MHz 3.5 3.15 2 Typ. Max. 5.5 5.5 8 80 1 5.5 1.25 1.25 1.25 -0.4 mA mA mA V V V V V V Unit
Total Device
Vc(SYNx)hi Clamp Voltage hi at SYN1, SYN2, SYNB Vc()lo Clamp Voltage lo at VDD, LDK, CI1, CI2, CIB, EN1, EN2, ENB, EP1, EP2, EPB, TTL, AGND1, AGND2, AGNDB, NER, VTTL, SYN1, SYN2, SYNB, IMON Pull-Down Current at CI1, CI2, CIB, TTL Pull-Down Current at EP1, EP2, EPB Overtemperature Shutdown
011 012 013 101 102 103 104 105 106 107 108 109 110 111 112
Ipd() Ipd(EPx) Toff
V() = 0.7...5.5 V TLL = hi, V() = 0.7...5.5 V
0.5 0.5 120
5 5 165 65 60
A A C mA mA mA mA V V I(LDKx) I(LDKB) A ns ns ns
Laser Control Icw(LDKx) Permissible CW Current in LDK1, LDK2 Icw(LDKB) Permissible CW Current in LDKB Ipk(LDKx) Permissible Pulsed Current in LDK1, LDK2 f > 100 kHz, thi / T < 1:10 f > 100 kHz, thi / T < 1:10 I(LDKx) = 30 mA I(LDKx) = 60 mA V(IMON) > 1.5 V, V(LDKx) > 1.5 V V(IMON) > 1.5 V, V(LDKx) > 1.5 V 1/105 1/80 0
300 275 0.8 1.2 1/85 1/70 10 1.5 1.5 10
Ipk(LDKB) Permissible Pulsed Current in LDKB Vsat(LKDx) Saturation Voltage at LKD1, LKD2, LDKB Imon() Imon() I0(LDKx) tr() tf() tp() Vcm() Switching Channels 1, 2 Bias Channel
Leakage Current in LDK1, LDK2, V(EPx) < V(ENx), V(LDKx) = VDD LDKB Current Rise Time at LDK1, LDK2, LDKB Iop(LDKx) = 55 mA, I(LDKx): 10% 90%Iop, cf. Fig. 1
Current Fall Time at LDK1, LDK2, Iop(LDKx) = 55 mA, I(LDKx): 90% 10%Iop, LDKB cf. Fig. 1 Propagation Delay V(EPx, ENx) I(LDKx) Common Mode Input Voltage Range at ENx, EPx TLL = lo; VDD = 3.5...5.5 V VDD = 4.5...5.5 V 0.8 0.6 -100 0.6
2.3 2.3 100 3 2
V V mV k V V mV
113 114 115 116 117
Vd() R() Vt(TTL)hi Vt(TTL)lo
Input Differential Voltage at ENx, TLL = lo EPx Differential Input Impedance at ENx, EPx Input Threshold Voltage hi Input Threshold Voltage low VDD = 5 V TLL = lo, V(ENx) < VDD - 2 V, V(EPx) < VDD - 2 V
0.8 100
Vhys(TTL) Hysteresis
IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 5/8 ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3.5...5.5 V, VTTL = 3.15...5.5 V, Tj = -25...125 C unless otherwise stated Item No. 118 119 120 121 122 123 124 125 126 127 128 Symbol Vt(EPx)hi Vt(EPx)lo Parameter Input Threshold Voltage hi at EP1, EP2, EPB Input Threshold Voltage low at EP1, EP2, EPB Threshold Voltage at CI1, CI2, CIB Current Matching Channel1 / Channel2 Current in NER Conditions Min. TTL = hi, ENx = open TTL = hi, ENx = open 0.8 20 I(LDKx) < 5 mA V(CI1) = V(CI2) = 0...VDD, I(LDKx) = tbd Tj > Toff, V(NER) > 0.6 V Tj > Toff, I(NER) = 1 mA Vs(SYNx)hi = VDD - V(SYNx), I() = -1 mA, V(EPx) < V(ENx) I() = 1 mA, V(EPx) > V(ENx) -20 3 0.9 0.9 1 1.4 1.1 20 600 0.4 0.4 -3 20 mA mV V V mA mA mV V Typ. Max. 2 V Unit
Vhys(EPx) Hysteresis Vt(CIx) CR() I(NER)
Vsat(NER) Saturation Voltage at NER Vs(SYNx)hi Saturation Voltage hi at SYN1, SYN2, SYNB Vs(SYNx)lo Saturation Voltage lo at SYN1, SYN2, SYNB
Isc(SYNx)hi Short-Circuit Current hi at SYN1, V(EPx) < V(ENx), V(SYNx) = 0 V, VTTL = 3.3 V SYN2, SYNB Isc(SYNx)lo Short-Circuit Current lo at SYN1, V(EPx) > V(ENx), V(SYNx) = VTTL, SYN2, SYNB VTTL = 3.3 V
ELECTRICAL CHARACTERISTICS DIAGRAMS
I(LDK) tr I op
90 % I op
tf
10 % I op
t
Figure 1: Laser current pulse in LDK
IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 6/8 DEMO BOARD IC-HB comes with a demo board for test purpose. Figures 2 and 3 show both the schematic and the component side of the demo board.
J2 4 J2 3 J2 2 J2 1 J2 10 A VDD C16 4.7uF GND1 GND A A A A
MDA LDC
VDD R6 C12 C13 C14 C15
LDA
2 D1
R4
C7 1uF
C8 1uF
C9
C10
C17 4.7uF
J1 20 J1 19
RC C4
A
A
A
A NER
3 MDA R5 MDA
1
C6 100nF
J1 18 J1 17 J1 16
JP2
SYNB J2 9 IMON X1 IC-HB R32 J2 7 CIB_1 R31 CIB R33 C31 R22 J2 6 CI2_1 R21 A A CI2 R23 C21 R12 CI1 VDD R13 CI1 C11 C1 1uF CI2 A CIB C3 1uF 17 CIB IMON 18 IMON 5 LDK1 LDK2 LDK 2 LDKB 3 VDD 15 10 VTTL VTTL VTTL
J1 15 J1 14
C5 100nF
J1 13 J1 12
IK3
SYNB 11 ENB 13 1k LVDS/TTL R3 EPB 14 ENB EPB
SYNB ENB EPB
J1 11 J1 6 J1 5 J1 8 SYN2 J1 7 J1 10 J1 9 J1 4 SYN1 J1 3 J1 2 J1 1
IC-HB
19 CI2
IK2
SYN2 22 EN2 23 R2 EP2 24 EN2 EP2 SYN2 EN2 EP2
C2 1uF 1k 12 CI1
A J2 5 CI1_1 R11
A
A
IK1
LVDS/TTL SYN1 9 EN1 8 R1 EP1 7 3 TTL 21 TTL 2 JP1 1 GND2 GND3 EN1 EP1 VDD SYN1 EN1 EP1
R7 NER J2 8 NER
A
A NER
A 20 NER OVERTEMP SHUTDOWN LVDS/TTL
1k
AGND1 6 A
AGND2 1 A
AGNDB 4 A
GND 16
SUB EPAD A
GND4
Figure 2: Schematic of the demo board
Figure 3: Demo board (component side)
IC-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 7/8
iC-Haus expressly reserves the right to change its products and/or specifications. An info letter gives details as to any amendments and additions made to the relevant current specifications on our internet website www.ichaus.de; 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-HB
TRIPLE 155 MHz LASER SWITCH
Rev A3, Page 8/8 ORDERING INFORMATION
Type IC-HB
Package QFN24 4 mm x 4 mm
Order Designation IC-HB QFN24
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.de/support_distributors.php

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