Electronic Components
KGA4145
11.3 Gbps EA Modulator Driver IC
October 1, 2008
ODHKGA4145-04
FEATURES
•
•
•
•
•
Input Interface
High Sensitive Input
Wide Output Amplitude Control
X-Point Controllability
Maximum Output Offset
: CML Compatible/AC Couple
: 0.35 Vpp (Single-ended)
: 1.0 Vpp to 3.0 Vpp
: 35 % to 80 %
: 1.2V ( @ 50Ω )
APPLICATIONS
• SONET OC-192 and SDH STM-64 Transmission Systems up to 11.3 Gbps
• 10GBE Systems
• DWDM Systems
• Optical Transmitters/Transceivers/Transponders
• SONET/SDH Test Equipment
GENERAL DESCRIPTION
The KGA4145 is a high performance electroabsorption modulator and direct modulated LASER diode driver for
SONET/SDH and 10GBE applications up to 11.3Gb/s. The device provides typically 3Vpp single-ended output,
output amplitude control, output offset control, and duty cycle (X-Point) control.
The KGA4145 data input accepts single ended or differential AC-coupled signals, or differential DC-coupled
signals. The output amplitude can be tuned from 1.0Vpp to 3.0Vpp by varying VC1. The output bias can be tuned
over 1.0V by varying VC2.
The KGA4145 is capable of adjusting the crossing point (X-point) from 35% to 80% of the output eye diagram via
the differential voltage between VB1 and VB2
KGA4145 is die form device.
FUNCTION DIAGRAM
INB
OUT
IN
VS VB1 VB2
VC1 VC2
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ODHKGA4145-04
KGA4145
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
X-Point Control Voltage
X-Point Reference Voltage
Output Amplitude Control Voltage
Output Bias Control Voltage
Input Voltage
Input Amplitude
Operating Temperature at Package Base
Storage Temperature
Symbol
VS
VB1
VB2
VC1
VC2
Vin(DC)
Vin
Ts
Tst
Min
-6.5
VS-5.0
(Min. -6.5)
VS-5.0
(Min. -6.5)
-6.5
-6.5
-2
-
-10
-40
Max
0.3
VS+3.0
(Max. 0.3)
VS+3.0
(Max. 0.3)
VS+1.6
(Max. 0.3)
VS+2.6
(Max. 0.3)
0.6
1.5
100
125
Unit
V
V
V
V
V
V
Vpp
°C
°C
DC coupled
AC coupled
Note
RECOMMENDED OPERATING CONDITIONS
Parameter
Supply Voltage
X-Point Control Voltage
X-Point Reference Voltage
Output Amplitude Control Voltage
Output Bias Control Voltage
Input High Voltage
Single-ended Input Amplitude
Differential Input Amplitude
Operating Temperature at Package Base
Input Interface
Output Interface
Symbol
VS
VB1
VB2
1)
Min
-5.46
VS+0.4
-4.2
VS
VS
-0.2
0.35
0.175
-5
Typ
-5.2
-
-3.95
-
-
-
-
-
-
Max
-4.94
VS+1.8
-3.7
VS+1.2
VS+2.4
0
1.2
1.2
90
DC coupled
Unit
V
V
V
V
V
V
Vpp
Vpp
°C
Note
VC1
VC2
VHin
Vin
Ts
DC coupled
AC coupled
DC/AC coupled
2)
DC coupled(CML) or AC coupled (External blocking capacitor is required)
1) VB2 can be open or biased by the external circuit.
For VB2 opened, VB2 is biased at about -3.952V ( VS=-5.2V ).
2) For DC coupled, input must be differential.
For AC coupled, differential or single-ended inputs are available.
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ODHKGA4145-04
KGA4145
ELECTRICAL CHARACTERISTICS
Typical values are at VS=-5.2V, Ts=25°C.
Parameter
Maximum Input Data Rate
Symbol
Condition
NRZ
minimum amplitude,
no offset
(VC1=VC2=VS)
maximum Amplitude,
Supply Current
Iss
no offset
(VC1=VS+1.2V,VC2=VS)
maximum Amplitude,
maximum offset
(VC1=VS+1.2V,
VC2=VS+2.4V)
50
Ω
load,Vs=-5.2V
Power consumption
Output Amplitude (Min)
Output Amplitude (Max)
Output High Voltage
Maximum Output High
Voltage Offset
Output Low Voltage
X-Point Control
Range
X-Point Stability
Output Rise/Fall Time
Input Return Loss
High
Low
Pwr
Vo (Min)
Vo (Max)
V (HI)
1)
Vo(ofs)max
1)
Output amplitude=2.5Vpp
Outpuut high Level=-1.0V
50
Ω
load
50
Ω
load
50
Ω
load
no offset
50
Ω
load
50
Ω
load,
V (LO)
XPH
XPL
Del (Xp)
Tr/Tf
S11
maximum amplitude,
maximum offset
50
Ω
load,
NRZ
50
Ω
load,
0–85°C
50
Ω
load,
20%/80%
100kHz–10 GHz
75
-
-
-
-
80
35
-
26
12
40
10
40
-
%
%
%
ps
dB
-
-
-3.3
V
-
-
2.7
-0.5
1.0
1.2
1
3
-
1.2
-
1.2
-
0
-
W
Vpp
Vpp
V
V
-
270
-
mA
-
220
-
mA
-
150
175
mA
Min
11.3
Typ
Max
Unit
Gbps
1) Output high voltage with offset control is defined by “ V(HI) – Vo(ofs) “.
GND
V(HI)
Vo(ofs)max
Vo(ofs)
Vo(min)
Vo(max)
V(LO)
VS
No Offset Condition
Maximum Offset Condition
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ODHKGA4145-04
KGA4145
PAD LAYOUT
290
60 90 60 90 60
170
70 60
240
60 90 60 90 60 90
85
190
16
85
120
17
6
120
120
145
190
85
90
60 90
7
90
85
190
15
14
13
12
11
10
9
8
90
18
5
190
85
1
2
3
4
290
60
240
60
170
220
+0
1800
-50
60
540
The thickness is 220
μm
± 30
μm
( Dimension in
μm
)
PAD ASSIGNMENT
No.
1
2
3
4
5
6
7
8
9
Symbol
GND
GND
GND
GND
OUT
GND
NC
GND
VC2
Note
Ground
Ground
Ground
Ground
Signal Output Port
Ground
Need to be left “Open”
Ground
Output Bias Control Port
No.
10
11
12
13
14
15
16
17
18
Symbol
VC1
GND
VS
VB2
VB1
GND
INB
GND
IN
Note
Output Amplitude Control Port
Ground
Supply Voltage Port
X-Point Reference Port
X-Point Control Port
Ground
Inverted Input Port
Ground
Signal Input Port
4/9
1300
-50
85
85
+0
ODHKGA4145-04
KGA4145
TYPICAL APPLICATION
VC2 : Output Offset Control
VB1 : Crossing Control
VB2 : Crossing Reference
VS: Supply Voltage (-5.2V)
VC1 : Output Amplitude Control
0.1uF
PKG
200pF
LD Anode
LD
GND VB1 VB2
DATA-BAR
Blocking
Capacitor
DATA
INB
GND
IN
GND
GND
GND
GND
VS
GND
VC1VC2
GND
NC
GND
KGA4145
50Ω
EA
OUT
EML
5/9
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