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參數(shù)資料
| 型號： | GD19903-68BA |
| 英文描述： | Laser Diode/LED Driver |
| 中文描述： | 激光二極管/ LED驅(qū)動器 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 121K |
| 代理商： | GD19903-68BA |
Functional Details
General
The GD19903 modulator driver incorpo-
rates a limiting amplifier and provides a
high power output.
The device performs the following
functions:
1.
High output drive capability, sufficient
to drive optical III-V modulator or an
LiNbO
3
at 9.952 Gbit/s data rate.
2.
On chip termination (50
to ground)
on the differential CML inputs.
Outputs must be externally AC cou-
pled and on-chip termination is pro-
vided to minimize reflections.
3.
The output amplitude can be adjusted
between maximum and minimum
values over a wide temperature and
operating range.
The amplitude can be controlled by a
DC current.
4.
Shutdown of output data takes place
when the amplitude control current
and AM control current are set to 0.
The residual output data amplitude
rms is within 1.5% of full amplitude.
Figure 1.
Application Diagram
Functionality
The GD19903 can be driven with a single
ended or a differential input. The unused
input does not need to be terminated, but
a 50
resistor AC coupled to GND is
recommended. The inputs can be DC
coupled, but then the applied circuit must
not alter the quiescent input voltage. The
DC level at the output vary with the out-
put voltage swing and therefore AC cou-
pling is recommended. When used to
drive a single ended load, the unused
output shall be 50
terminated via an
AC coupling capacitor. (See
Figure 1
)
The amplifier output voltage swing is
controlled through the current flowing into
the pins ISET1 and ISET2. It is recom-
mended that the two pins are tied to-
gether giving a common impedance of
typical 45
.
Figure 3
shows a typical
measurement of VOUT vs. ISET = ISET1
+ ISET2. The slope is 0.12 V/mA.
If the two ISET pins are both left open
and the Vset pin is connected to GND
maximum output voltage swing is
achieved. This setting is only recom-
mended for test purposes and VSET in-
put shall normally be left open with a
capacitor to GND. Shutting the outputs
off can be obtained by tying both ISET1
and ISET2 to VEE.
Figure 2.
VOUT vs. ISET (Typical).
Figure 3.
VMON - VMONREF vs. VOUT
(Typical).
The voltage difference between Vmon
and Vmonref is a measure of the driver
output level with a slope of 37 mV/V.
Please observe that this relation is only
valid with input signals levels within the
specified range.
Figure 2
shows a typical
measurement of VMON – VMONREF vs.
VOUT
Special Precautions
When the GD19903 is used to drive a
single-ended load, the unused output
shall be terminated (AC coupled) to
50
.
Inputs VIN/VINN are open circuit and
short circuit (to ground) protected.
Outputs VOUT/VOUTN are open circuit
protected only. AC short circuit is
allowed.
Note:
DC short circuit to ground will
cause permanent damage to
the device.
Data Sheet Rev. 04
GD19903
Page 2 of 7
VCC
+5V
50
50
50
VOUT
GD19903
Modulator
GD16555A
MUX/PLL
VIN
VINN
VOUTN
ISET1
ISET2
FEB
Iam
Iamp
FEB = Ferrite Bead
V
V
VEE
-8.0V
0
0,05
0,1
0,15
0,2
0,25
0
1
2
3
4
5
6
Vout [Vpp]
V
0
1
2
3
4
5
6
0
5
10
15
20
25
30
35
40
Iset [mA]
V
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