1Electronic Components
August 28, 2002
GTD-18551 Rev. 3.0
KGA4125
Preliminary
10.7 Gbps EA Modulator Driver IC
1/5
FEATURES
Low Power
: 0.8 W (@minimum amplitude, no offset )
Input Interface
: CML Compatible / AC coupled
High Sensitive Input
: 0.15 Vpp (differential)
Output Amplitude Control
: 0.8 Vpp to 2.3 Vpp
X-Point Controllability
: 35 % to 80 %
Maximum Output Offset
: 1.3 V ( @50
)
Logic Inversion Function
FUNCTION DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Min
Max
Unit
Note
Supply Voltage
VS
-6.5
0.3
V
X-Point Control Voltage
VB1
VS-5.0
(Min. -6.5)
VS+3.0
(Max. 0.3)
V
X-Point Reference Voltage
VB2
VS-5.0
(Min. -6.5)
VS+3.0
(Max. 0.3)
V
Output Amplitude Control Voltage
VC1
-6.5
VS+1.6
(Max. 0.3)
V
Output Bias Control Voltage
VC2
-6.5
VS+2.6
(Max. 0.3)
V
Logic Inversion Control Voltage
VPN
-6.5
0.3
V
Input Voltage
Vin(DC)
-2
0.6
V
DC coupled
Input Amplitude
Vin
-
1.5
Vpp
AC coupled
Operating Temperature at the Back Side of
the Chip
Ts
-10
100
C
Storage Temperature
Tst
-40
125
C
IN
INB
OUT
Logic
Inversion
Crossing
Point
Control
VPN
VS VB1 VB2
VC1 VC2
GTD-18551 Rev. 3.0
1Electronic Components
KGA4125
2/5
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
Min
Typ
Max
Unit
Note
Supply Voltage
VS
-5.5
-5.2
-4.9
V
X-Point Control Voltage
VB1
VS+0.4
-
VS+2.5
V
X-Point Reference Voltage
VB2
1)
-4.2
-3.95
-3.6
V
Output Amplitude Control Voltage
VC1
VS
-
VS+1.2
V
Output Bias Control Voltage
VC2
VS
-
VS+2.4
V
VS
-
VS+0.5
V
Positive Output
Logic Inversion Control Voltage
VPN
2)
-0.5
-
0
V
Negative Output
Input High Voltage
VHin
-0.2
-
0
V
DC coupled
Single-ended Input Amplitude
0.25
-
1.2
Vpp
AC coupled
Differential Input Amplitude
Vin
0.15
-
1.2
Vpp
DC/AC coupled
Operating Temperature at the Back Side of
the Chip
Ts
0
-
90
C
Input Interface
DC coupled(CML) or AC coupled (External blocking capacitor is required)
3)
Output Interface
DC coupled
1) VB2 can be open or biased by the external circuit.
For VB2 opened, VB2 is biased at about 3.95V ( VS=-5.2V ).
2) For VPN opened, output polarity is positive.
3) For DC coupled, input must be differential.
For AC coupled, differential or single-ended inputs are available.
ELECTRICAL CHARACTERISTICS
Output polarity : Positive ( VPN = VS )
Parameter
Symbol
Condition
Min
Typ
Max
Unit
Supply Current
Iss
minimum amplitude,
no offset
(VC1=VC2=VS)
-
-
165
mA
Output Amplitude (Min)
Vo (Min)
50
load
-
0.8
0.9
Vpp
Output Amplitude (Max)
Vo (Max)
50
load
2.2
2.3
-
Vpp
Output High Voltage
V (HI)
1)
50
load,
no offset
-0.5
-
0
V
Output High Voltage Offset
Vo (ofs)
1)
50
load
1.1
1.3
-
V
Output Low Voltage
V (LO)
50
load,
maximum amplitude,
maximum offset
-
-
-3.3
V
High
XPH
75
80
%
X-Point Control Range
Low
XPL
50
load,
NRZ
-
35
40
%
X-Point Stability
Del (Xp)
50
load,
085C
-10
-
10
%
Output Rise/Fall Time
Tr/Tf
50
load,
20%/80%
-
25
35
ps
Input Return Loss
S11
100kHz10 GHz
-
13
-
dB
1) Output high voltage with offset control is defined by " V(HI) Vo(ofs) ".
GTD-18551 Rev. 3.0
1Electronic Components
KGA4125
3/5
PAD LAYOUT
( Unit :
m )
The thickness is 220
m 30
m
290
60 90 60
320
220
60
540
290
60 90
90
60
60
170
60
240
70
60 90
90
60
60 90
190
85
90
85
120
120
85
90
85
190
215
60
90
60
145
120
85
90
85
190
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
PAD ASSIGNMENT
No.
Symbol
Note
1
GND
Ground
2
VPN
Logic Inversion Control Port
3
GND
Ground
4
GND
Ground
5
OUT
Signal Output Port
6
GND
Ground
7
-
TBD
8
GND
Ground
9
VC2
Output Bias Control Port
No.
Symbol
Note
10
VC1
Output Amplitude Control Port
11
GND
Ground
12
VS
Supply Voltage Port
13
VB2
X-Point Reference Port
14
VB1
X-Point Control Port
15
GND
Ground
16
INB
Inverted Input Port
17
GND
Ground
18
IN
Signal Input Port
GTD-18551 Rev. 3.0
1Electronic Components
KGA4125
4/5
TYPICAL APPLICATION
APPLICATION NOTE
1. For stable operation;
1-1. To prevent a dependence of "X-Point" on the supply voltage VS,
(1) Use an external voltage source of 3.8V for "VB2", or
(2) Control the voltage of "VB1", so that the voltage difference "VB1VB2" is constant.
1-2. To prevent a dependence of "Output amplitude" on the supply voltage VS,
Control the voltage of "VC1", so that the voltage difference "VC1VS" is constant.
1-3. To prevent a dependence of "Output bias control voltage" on supply voltage VS,
Control the voltage of "VC2", so that the voltage difference "VC2VS" is constant.
2. Power-up/shut-down sequence;
For power-up, supply control voltages (VB1, (VB2), VC1, VC2) at first, then Vs
or supply all simultaneously.
For shut-down, Vs at first, then control voltages or shut down all simultaneously. .
Customer does not need to care about the sequence for the control voltages (VB1,(VB2),VC1,VC2).
EAM
Transmission Line
Transmission Line
200pF
This capacitor is connected between
VS and GND nearby the chip.
> 0.1uF
VB1
VB2
VS
VC1
VC2
VPN
INB
IN
GTD-18551 Rev. 3.0
1Electronic Components
KGA4125
5/5
SAFETY AND HANDRING INFORMATION ON GaAs DEVICES
Arsenic Compound (GaAs Devices)
The product contains arsenic (As) as a compound.
This material is stable for normal use, however, its dust or vapor may be potentially hazardous 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 improvements.
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 and performance of the product. When planning to use the product, please
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 responsibility 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 specified
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 drawings contained herein.
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 use in any system or application that requires special
or enhanced quality and reliability characteristics nor in any system or application where the failure of such
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, traffic and automotive equipment, safety devices, 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.
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