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參數(shù)資料
| 型號： | GD16521-D |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 2.5 GBIT/S RE TIMING LASER DRIVER |
| 中文描述： | 2.5 Gbit / s的稀土激光驅(qū)動時序 |
| 文件頁數(shù)： | 4/13頁 |
| 文件大?。?/td> | 166K |
| 代理商： | GD16521-D |
Applications
Temperature Monitor
An on-chip, diode connected transistor is
used to monitor the junction temperature
in the proximity of the output stage. The
voltage at pin MTJ decreases with in-
creasing temperature, see
Figure 4
.
Figure 4.
Temperature Monitor.
Figure 5.
Voltage at pin MTJ versus
Temperature.
DC Coupling
For a compact design, pre-bias and mod-
ulation current can be DC coupled. DC
coupling is appropriate when connections
between laser driver and laser diode are
kept short (with low inductance) as
achieved, e.g. by flip-chip mounting of
the two dice in close proximity, see
Figure 10 on page 5
. The GD16521 is
optimized for this configuration.
AC Coupling
AC coupling is recommended for the
packaged version, in particular when the
output is connected to the laser diode
through a transmission line, see
Figure 6
.
Figure 6.
AC coupled output.
Duty Cycle Adjustment
The
“
on-time
”
of the laser current (IM-pin)
can be increased up to 20% by control-
ling the voltage at the Duty input. In the
configuration in
Figure 7
, a smaller R re-
sults in a longer on-time. The duty cycle
adjustment can be monitored using the
Mark/Space monitor outputs (MARKP/
MARKN), see
Figure 8
.
Figure 7.
Duty cycle adjustment with an
external resistor.
Figure 8.
MARKP/MARKN outputs.
Laser Diode Slope Efficiency
Compensation
The pre-bias control loop may be used to
make a simple compensation for
changes in the slope efficiency of a laser
diode, in order to maintain a constant ex-
tinction ratio. Typically the slope effi-
ciency of the laser diode is inversely
proportional to the threshold current, as
shown in
Figure 9
below. Therefore the
pre-bias monitor current will compensate
changes in the threshold current of the
laser diode if it is added to the reference
voltage on pin IMC at a ratio. This ratio
may be chosen individually for the spe-
cific laser diode and is set by an external
R as shown in
Figure 3
on
page 3
.
Thereby the extinction ratio may be
maintained at a constant ratio. The varia-
tion of the pre-bias monitor current com-
pared to the pre-bias current is only
+/-1% over temperature and supply, en-
suring that the performance is not sacri-
ficed by changes in this ratio.
Figure 9.
Laser diode characteristics
Data Sheet Rev.: 11
GD16521
Page 4 of 13
VCC
VEE
MTJ
2k
TEMP
V
0
50
100
- 30
130
0. 80V
0. 90V
1. 00V
0. 75V
L1
220uH
L3
220uH
L2
IMB
IM
IB
L4
L
100nF
100nF
25
25
VCC
VCC
VCC
VCC
VCC
VCC
VEE
VEE
1k
R
VEE
DUTY
100nF
MARKP
MARKP
P
O
I
L
L1 and L3 = Siemens Chip
Inductors (B82432A1224K).
L2 and L4 = Siemens ferrite
cores B64290-A36-X33 with
8 turns of 0.22mm Cu-Wire.
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