HBQFN24 ROITHNER | Alldatasheet
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Technical content
TRIPLE 155 MHz LASER SWITCH Rev A4, Page 1/8
FEATURES
♦ 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
♦ Laser printers ♦ Data transmission ♦ Laser scanning devices PACKAGES QFN24 4 mm x 4 mm BLOCK DIAGRAM LVDS/TTL LVDS/TTL 1k iC−HB LVDS/TTL OVERTEMP SHUTDOWN IK1 IKB IK2 CIB CI2 CI1 LDK2 AGND2AGND1 IMON LDK1 AGNDB LDKB NER GND VDD VTTL SYNB EN2 EP2 SYN1 EN1 EP1 TTL SYN2 EPB ENB Copyright © 2013 iC-Haus http://www.ichaus.com
TRIPLE 155 MHz LASER SWITCH Rev A4, 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) 92 + I(LDKB) Each channel can be operated at 65 mA DC (chan- nel B: 60 mA) and up to 300 mA (channelB: 275 mA) pulsed current depending on the frequency, duty cy- cle and heat dissipation. The integrated thermal shutdown feature protects the IC from damage by excessive temperature. PACKAGING INFORMATION QFN24 to JEDEC PIN CONFIGURATION QFN24 4 mm x 4 mm 7 8 9 10 11 2122 1920 2324 HB code... ... 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
No. Name Function
7 EP1 Positive LVDS/TTL switching input chan-
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 chan-
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 chan-
For improved heat dissipation the thermal padis 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).
TRIPLE 155 MHz LASER SWITCH Rev A4, Page 3/8 ABSOLUTE MAXIMUM RATINGS Beyond these values damage may occur; device operation is not guaranteed. Item Symbol Parameter Conditions Unit No. Min. Max. G001 VDD Voltage at VDD -0.7 6 V G002 I(VDD) Current in VDD -10 150 mA G003 V(CIx) Voltage at CI1, CI2, CIB -0.7 6 V G004 I(LDKc) Current in LDK1, LDK2, LDKB DC current -10 300 mA G005 I(AGND1) Current in AGND1, AGND2, AGNDB DC current -150 10 mA G006 V() Voltage at EN1, EN2, AGND1, AGND2, AGNDB -0.7 6 V G007 V(LDKx) Voltage at LDK1, LDK2, LDKB -0.7 6 V G008 Vd() Susceptibility to ESD at all pins HBM, 100 pF discharged through 1.5 kΩ 4 kV G009 Tj Operating Junction Temperature -40 150 °C G010 Ts Storage Temperature Range -40 150 °C THERMAL DATA Item Symbol Parameter Conditions Unit No. Min. Typ. Max. T01 Ta Operating Ambient Temperature Range (extended range on request) -25 85 °C T02 Rthja Thermal Resistance Chip/Ambient soldered to PCB, therm. pad soldered to approx. 2 cm² cooling area 30 60 K/W 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.
TRIPLE 155 MHz LASER SWITCH Rev A4, Page 4/8
ELECTRICAL CHARACTERISTICS
Item Symbol Parameter Conditions Unit No. Min. Typ. Max. Total Device 001 VDD Permissible Supply Voltage 3.5 5.5 V
002 VTTL Permissible Supply Voltage at
3.15 5.5
003 I(VDD) Supply Current in VDD CW operation 2 8 mA
004 I(VDD) Supply Current in VDD pulsed operation, f(ENx, EPx) = 150 MHz 80 mA
005 I(VTTL) Supply Current in VTTL 1 mA
006 V(LDKx) Permissible Voltage at LDK1,
LDK2, LDKB 0 5.5 V
007 Vc(CIx)hi Clamp Voltage hi at CI1, CI2, CIB Vc(CIx) = V(CIx) −VDD, I(CIx) = 10 mA, other
0.4 1.25 V 008 Vc(TTL)hi Clamp Voltage hi at TTL Vc(TTL)hi = V(TTL) −VDD, I(TLL) = 0.1 mA, other pins open 0.4 1.25 V
009 Vc(SYNx)hi Clamp Voltage hi at SYN1,
SYN2, SYNB Vc(SYNx)hi = V(SYNx) −VTTL, I(EN) = 1 mA, other pins open 0.4 1.25 V
010 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 I() = -10 mA, other pins open -1.25 -0.4 V
011 Ipd() Pull-Down Current at CI1, CI2,
CIB, TTL
012 Ipd(EPx) Pull-Down Current at EP1, EP2,
013 Toff Overtemperature Shutdown 120 165 °C
101 Icw(LDKx) Permissible CW Current in LDK1,
102 Icw(LDKB) Permissible CW Current in LDKB 60 mA
103 Ipk(LDKx) Permissible Pulsed Current in
LDK1, LDK2 f > 100 kHz, thi / T < 1:10 300 mA
104 Ipk(LDKB) Permissible Pulsed Current in
f > 100 kHz, thi / T < 1:10 275 mA
105 Vsat(LKDx) Saturation Voltage at LKD1,
LKD2, LDKB I(LDKx) = 30 mA 0.8 V I(LDKx) = 60 mA 1.2 V 106 Imon() Switching Channels 1, 2 V(IMON) > 1.5 V, V(LDKx) > 1.5 V 1/105 1/85 I(LDKx) 107 Imon() Bias Channel V(IMON) > 1.5 V, V(LDKx) > 1.5 V 1/80 1/70 I(LDKB)
108 I0(LDKx) Leakage Current in LDK1, LDK2,
V(EPx) < V(ENx), V(LDKx) = VDD 0 10 µA 109 tr() Current Rise Time at LDK1, LDK2, LDKB Iop(LDKx) = 55 mA, I(LDKx): 10% →90%Iop, cf. Fig. 1 1.5 ns 110 tf() Current Fall Time at LDK1, LDK2, LDKB Iop(LDKx) = 55 mA, I(LDKx): 90% →10%Iop, cf. Fig. 1 1.5 ns 111 tp() Propagation Delay V(EPx, ENx) →I(LDKx) 10 ns
112 Vcm() Common Mode Input Voltage
Range at ENx, EPx TLL = lo;
113 Vd() Input Differential Voltage at ENx,
TLL = lo -100 100 mV
114 R() Differential Input Impedance at
ENx, EPx TLL = lo, V(ENx) < VDD −2 V, V(EPx) < VDD−2 V 0.6 3 kΩ
115 Vt(TTL)hi Input Threshold Voltage hi 2 V
116 Vt(TTL)lo Input Threshold Voltage low VDD = 5 V 0.8 V
117 Vhys(TTL) Hysteresis 100 mV
TRIPLE 155 MHz LASER SWITCH Rev A4, Page 5/8 Item Symbol Parameter Conditions Unit No. Min. Typ. Max.
118 Vt(EPx)hi Input Threshold Voltage hi at
EP1, EP2, EPB TTL = hi, ENx = open 2 V
119 Vt(EPx)lo Input Threshold Voltage low at
EP1, EP2, EPB TTL = hi, ENx = open 0.8
120 Vhys(EPx) Hysteresis 20 mV
121 Vt(CIx) Threshold Voltage at CI1, CI2,
I(LDKx) < 5 mA 0.9 1.4 V
122 CR() Current Matching Chan-
V(CI1) = V(CI2) = 0...VDD, I(LDKx) = 30...300 mA 0.9 1.1 123 I(NER) Current in NER Tj > Toff, V(NER) > 0.6 V 1 20 mA
124 Vsat(NER) Saturation Voltage at NER Tj > Toff, I(NER) = 1 mA 600 mV
125 Vs(SYNx)hi Saturation Voltage hi at SYN1,
SYN2, SYNB Vs(SYNx)hi = VDD −V(SYNx), I() = -1 mA, V(EPx) < V(ENx) 0.4 V
126 Vs(SYNx)lo Saturation Voltage lo at SYN1,
SYN2, SYNB I() = 1 mA, V(EPx) > V(ENx) 0.4 V
127 Isc(SYNx)hi Short-Circuit Current hi at SYN1,
SYN2, SYNB V(EPx) < V(ENx), V(SYNx) = 0 V, VTTL = 3.3 V -20 -3 mA
128 Isc(SYNx)lo Short-Circuit Current lo at SYN1,
SYN2, SYNB V(EPx) > V(ENx), V(SYNx) = VTTL, VTTL = 3.3 V 3 20 mA ELECTRICAL CHARACTERISTICS DIAGRAMS I(LDK) t Iop 10 % I op 90 % I op t r t f Figure 1: Laser current pulse in LDK
TRIPLE 155 MHz LASER SWITCH Rev A4, Page 8/8
ORDERING INFORMATION
Type Package Order Designation iC-HB QFN24 4 mm x 4 mm iC-HB QFN24 For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Tel.: +49 (0) 61 35 - 92 92 - 0 Am Kuemmerling 18 Fax: +49 (0) 61 35 - 92 92 - 192 D-55294 Bodenheim Web: http://www.ichaus.com GERMANY E-Mail: sales@ichaus.com Appointed local distributors: http://www.ichaus.com/sales_partners