
1
Electronic Components
September 9, 2002
GTD-18609 Rev. 1.1
KGL4175HW
10.7 Gbps Direct Modulation Driver IC
Preliminary
FEATURES
• Low Power : 0.6 W (excluding modulation current and bias current)
• High Sensitive Input : 0.25 Vpp (differential)
• Modulation Current Control : 20 mApp to 50 mApp
• Bias Current Control : 0 mA to 45 mA
• X-Point Controllability : 40 % to 60 %
FUNCTION DIAGRAM
VD1
INB
IN
50Ω
Crossing
Point
Control
50Ω
150Ω
OUT
BIAS
VB1 VB2 VC1 VC2
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Min Max Unit Note
Supply Voltage VD1 -0.3 4 V
Voltage of Modulation Current Output V(OUT) -0.3 6 V
Voltage of Bias Current Output V(BIAS) -0.3 6 V
X-Point Control Voltage VB1 -1 +2.5 V
X-Point Reference Voltage VB2 -1 +2.5 V
Modulation Current Control Voltage VC1 -1 +1.6 V
Bias Current Control Voltage VC2 -1 +2.6 V
Input Amplitude Vin - 1.6 Vpp AC coupled
Operating Temperature at Package Base Ts -10 100 °C
Storage Temperature Tst -40 125 °C
1/6

GTD-18609 Rev. 1.1
1
Electronic Components
KGL4175HW
RECOMMENDED OPERATING CONDITIONS
Parameter Symbol Min Typ Max Unit Note
Supply Voltage VD1 3.13 3.3 3.47 V
Low Voltage of Modulation Current Output VL(OUT) 1.4 - - V
Low Voltage of Bias Current Output VL(BIAS) 1.9 - - V
X-Point Control Voltage VB1 0.6 1.2 1.8 V
Vin
1)
0.25 - 1.2 Vpp AC coupled
1.2 V
X-Point Reference Voltage VB2
Output Amplitude Control Voltage VC1 0 - 1.2 V
Output Bias Control Voltage VC2 0 - 2.4 V
Single-ended Input Amplitude 0.5 - 1.2 Vpp AC coupled
Differential Input Amplitude
Operating Temperature at Package Base Ts 0 - 85 °C
Input Interface AC coupled (External blocking capacitor is required)
Output Interface DC coupled( Pull up through LD )
1) VB2 can be open or biased by the external circuit.
For VB2 opened, VB2 is biased at about 1.2V ( VD1=3.3V ).
ELECTRICAL CHARACTERISTICS ( TARGET SPECIFICATIONS)
Parameter Symbol Condition Min Typ Max Unit
Maximum Operating Data Rate NRZ 10.7 - - Gbps
Supply Current Id1 - 150 180 mA
Minimum Modulation Current Imod (min) 50 Ω load - 20 25 mApp
Maximum Modulation Current Imod (max) 50 Ω load 45 50 - mApp
Minimum Bias Current Ibias (min) 50 Ω load - 0 0.5 mA
Maximum Bias Current Ibias (max) 50 Ω load 40 45 - mA
X-Point Control Range
X-Point Stability Del (Xp)
Output Rise/Fall Time Tr/Tf
Input Return Loss S11 100kHz–10 GHz - 13 - dB
High XPH 57 60 %
Low XPL
50 Ω load,
NRZ
50 Ω load,
0–85°C
50 Ω load,
20%/80%
-4043%
-10 - 10 %
-2537ps
2/6

1
Electronic Components
AC CHARACTERISTICS TEST CIRCUIT
0.1µF
GTD-18609 Rev. 1.1
KGL4175HW
Power Suppl
(VD1)
+3.8
50Ω
PULSE
PATTERN
GENERATOR
50Ω Transmission Line
Fc=7.5GHz
Bessel
Filter
∼
∼
∼
∼
∼
∼
∼
∼
∼
∼
∼
∼
Blocking
Capacitor
GND
VB1
(VB1)
KGL4175HW
0.1µF
Power Supply
VD1
VB2
0.1µF
VC1 VC2
0.1µF
Power Supply
(VC1)
(VC2)
OSCILLO
-SCOPE
Bias-T
50Ω Transmission Line
IBIAS
←
0.1µF
Power Supply
+3.8V
3/6

1
Electronic Components
GTD-18609 Rev. 1.1
KGL4175HW
PACKAGE DIMENSIONS
4.445
24 17
25
K4175
1
HW
32
1 8
Note. This package is non-hermetic.
(Lot No.)
7.0±0.2
op View
T
28-0.635
16
9
1.5±0.25
0.35
Unit : mm
PIN CONNECTION
No. Symbol Note
1 GND Ground
2 GND Ground
3 GND Ground
4 GND Ground
5 GND Ground
6 GND Ground
7 BIAS Bias Current Output Port
8 GND Ground
9 GND Ground
10 OUT Modulation Current Output Port
11 GND Ground
7.0±0.2
12 GND Ground
13 GND Ground
14 GND Ground
15 GND Ground
16 GND Ground
17 GND Ground
18 VC2 Bias Current Control Port
19 VC1 Modulation Current Control Port
20 VD1 Supply Voltage Port
21 VD1 Supply Voltage Port
0.4
0.62
0.125
0.5
22 VB2 X-Point Reference Port
23 VB1 X-Point Control Port
24 GND Ground
25 GND Ground
26 GND Ground
27 GND Ground
28 INB Inverted Input Port
29 GND Ground
30 GND Ground
31 IN Signal Input Port
32 GND Ground
4/6

1
Electronic Components
GTD-18609 Rev. 1.1
KGL4175HW
TYPICAL APPLICATION
Data-bar Input
D
In
Blocking
Capacitor
F
Ex. 0.1
Chip
Capacitor
F
≥ 0.1
VB2
VB1
VD1
GND
Supply Voltage
KGL4175HW
VC1 VC2
Pull
Choke
Coil
LD Module
X-Point Control
X-Point Refe r e nce
Output
mplitude
Output Bias
Control
APPLICATION NOTE
1. For stable operation;
1-1. To prevent a dependence of “X-Point” on the supply voltage VD1,
(1) Use an external voltage source of 1.2V for “VB2”, or
(2) Control the voltage of “VB1”, so that the voltage difference “VB1–VB2” is constant.
2. Power-up/shut-down sequence;
For power-up , LD pull up volta ge a t first , next supp ly volta ge(V D1), then c ontro l volta ges (VB 1, VB2,
VC1, VC2) or supply all simultaneously.
For shut-down, control voltages at first, next VD1 then LD pull up voltage or shut down all
simultaneously. .
Customer does not need to care about the sequence for the control voltages (VB1,VB2,VC1,VC2).
Chip
Capacitor
F
≥ 0.1
5/6

GTD-18609 Rev. 1.1
1
Electronic Components
KGL4175HW
SAFETY AND HANDRING INFORMATION ON GaAs DEVICES
Arsenic Compound (GaAs Devices)
The product contains arsenic (As) as a compound.
This material is stable for norm al use, however, its dust or vapor m ay be potentially hazardou s to the human
body.
Avoid ingestion, fracture, burning or chemical treatment to the product.
• Do not put the product in your mouth.
• Do not burn or destroy the product.
• Do not perform chemical treatment for the product.
Keep laws and ordinances related to the disposal of the products.
NOTICE
1. The information contained herein can change without notice owing to product and/or technical improv ements.
Before using the product, please make sure that the information being referred to is up-to-date.
2. The outline of action and examples for application circuits described herein have been chosen as an
explanation for the standard action an d performan ce of the product. Wh en planning to use t he product, pleas e
ensure that the external conditions are reflected in the actual circuit, assembly, and program designs.
3. When designing your product, please use our product below the specified maximum ratings and within the
specified operating ranges including, but not limited to, operating voltage, power dissipation, and operating
temperature.
4. Oki assumes no responsibilit y or liability whatsoever for any failure or unusual or unexpected operation
resulting from misuse, neglect, improper installation, repair, alteration or accident, improper handling, or
unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the s pecified
maximum ratings or operation outside the specified operating range.
5. Neither indemnity against nor license of a third party’s industrial and intellectual property right, etc. is
granted by us in connection with the use of the product and/ or the information and draw ings contained h erein.
No responsibility is assumed by us for any infringement of a third party’s right which may result from the use
thereof.
6. The products listed in this document are intended for use in general electronics equipment for commercial
applications (e.g., office automation, communication equipment, measurement equipment, consumer
electronics, etc.). These products are not authorized for u s e in any system or application that requ ires s pecial
or enhanced quality and reliability characteristics nor in any system or applicatio n where the failure of s uch
system or application may result in the loss or damage of property, or death or injury to humans.
Such applications include, but are not limited to, traf fic and automotive equ ipment, safety devi ces, aerospace
equipment, nuclear power control, medical equipment, and life-support systems.
7. Certain products in this document may need government approval before they can be exported to particular
countries. The purchaser assumes the responsibility of determining the legality of export of these products
and will take appropriate and necessary steps at their own expense for these.
8. No part of the contents contained herein may be reprinted or reproduced without our prior permission.
Copyright 2002 Oki Electric Industry Co., Ltd.
6/6