1Electronic Components
August 16, 2002
GTD-18481 Rev. 4.0
KGL4125HW/GW
Preliminary
10.7 Gbps EA Modulator Driver IC
1/6
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 Package Base
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-18481 Rev. 4.0
1Electronic Components
KGL4125HW/GW
2/6
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 Package Base
Ts
0
-
85
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
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,
070C
-10
-
10
%
Output Rise/Fall Time
Tr/Tf
50
load,
20%/80%
-
25
35
ps
KGL4125HW
100kHz10 GHz
-
13
-
dB
Input Return Loss
S11
KGL4125GW
100kHz10 GHz
-
10
-
dB
1) Output high voltage with offset control is defined by " V(HI) Vo(ofs) ".
GTD-18481 Rev. 4.0
1Electronic Components
KGL4125HW/GW
3/6
PACKAGE DIMENSIONS(KGL4125HW)
Note. This package is non-hermetic.
PIN CONNECTION
No. Symbol
Note
1
GND
Ground
2
VPN
Logic Inversion Control Port
3
GND
Ground
4
GND
Ground
5
GND
Ground
6
GND
Ground
7
GND
Ground
8
GND
Ground
9
GND
Ground
10
OUT
Signal Output Port
11
GND
Ground
12
GND
Ground
13
GND
Ground
14
GND
Ground
15
GND
Ground
16
GND
Ground
17
GND
Ground
18
VC2
Output Bias Control Port
19
VC1
Output Amplitude Control Port
20
VS
Supply Voltage Port
21
VS
Supply Voltage Port
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
4.445
Unit : mm
(Top View)
0.4
0.125
0.62
0.5
28-0.635
7
.0
0.2
7.00.2
25
32
24 17
16
9
1.50.25
1 8
K4125
1
HW
(Lot No.)
GTD-18481 Rev. 4.0
1Electronic Components
KGL4125HW/GW
4/6
PACKAGE DIMENSIONS(KGL4125GW)
Note. This package is non-hermetic.
PIN CONNECTION
No. Symbol
Note
1
GND
Ground
2
VPN
Logic Inversion Control Port
3
GND
Ground
4
GND
Ground
5
GND
Ground
6
GND
Ground
7
GND
Ground
8
GND
Ground
9
GND
Ground
10
OUT
Signal Output Port
11
GND
Ground
12
GND
Ground
13
GND
Ground
14
GND
Ground
15
GND
Ground
16
GND
Ground
17
GND
Ground
18
VC2
Output Bias Control Port
19
VC1
Output Amplitude Control Port
20
VS
Supply Voltage Port
21
VS
Supply Voltage Port
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
9.6
0.3 SQ
8.6 SQ
8.2 SQ
6.5 SQ
0.1
0.25
0.125
0.775
0.4
0.62
0.5
7
0.2 SQ
28
-
0.635
32
-
0.2
4.445
5.2 SQ
K4125
1
GW
1 8
16
9
24 17
25
32
Unit : mm
(Top View)
GTD-18481 Rev. 4.0
1Electronic Components
KGL4125HW/GW
5/6
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 "VB1 VB2" 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 "VC1 VS" 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 "VC2 VS" 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).
Output Bias
Control
Data Input
IN
OUT
GND
Blocking
Capacitor
Ex. 0.1
F
Chip
Capacitor
0.1
F
Supply Volta
ge
Output
Amplitude
Control
X
-
Point Reference
VB1
KGL4125HW/GW
EAM
50
X
-
P
oint Control
Logic
Inversion
Control
Data-bar Input
INB
VPN
VB2 VS VC1 VC2
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