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參數(shù)資料
| 型號： | GD16076A-25SLP |
| 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)： | 2/9頁 |
| 文件大?。?/td> | 332K |
| 代理商： | GD16076A-25SLP |
Functional Details
GD16076A is designed to drive external
loads with a characteristic impedance of:
u
25
(GD16076A-25SLP)
u
50
(GD16076A-50SLP).
With DIN high the sink current into OUT
will be high.
In order to avoid reflections, and thereby
to obtain optimum performance, connec-
tions from OUT and/or NOUT must be
made with a transmission line of 25
(50
), terminated at the device end into
a matched load. This is because OUT
and NOUT are unterminated open drain
outputs and effectively can be regarded
as modulated current sources.
The termination voltage on an output is
determined by the load impedance Z
L
(25
or 50
) and the output current
I
OUT
. The optimum termination voltage
V
CC
is:
V
CC
= V
DD
- 2V + Z
L
× I
OUT
see: “Thermal Considerations” in the sec-
tion
Application Information
below.
The driver output current I
OUT
can be
measured as the voltage drop across a
resistor R
SIP
, internally on the chip, con-
nected in between the VEEP pin and the
SIP pin.
Figure 1.
Application Diagram
By using an external general purpose
operational amplifier, as illustrated in
Figure 1, the driver output current I
OUT
may be controlled accurately and inde-
pendent of environmental changes.
VREF in Figure 1 should be R
SIP
I
OUT
,
see above. The OP-amp must be able to
drive CIP in the range VEEP - 1.2 V to
VEEP +1.2 V.
R
SIP
is made of two resistors of 4
, as
shown in Figure on page 1. One of the
resistors are connected to the VEEP pins
4 and 5, and the other to the VEEP pins
16 and 17. If all VEEP are connected,
R
SIP
is 2
. Each resistor has been
dimensioned to withstand 100 mA.
Therefore if the output current I
OUT
is
> 100 mA the VEEP pins on opposite
sides must be connected externally in
order not to damage the chip.
Notice that the transistors driving OUT
and NOUT are susceptible to breakdown.
Therefore the peak voltage on OUT and
NOUT should never exceed 10.0 V
above VEEP as specified in
Maximum
Ratings
.
Application Information
In this section the behaviour of
GD16076A is described when used in
connection with a LiNbO
3
Mach Zender
Interferometer, for simplicity called “the
modulator”. First the modulator and a
transfer function from electrical to optical
signal is derived. Next a SPICE simula-
tion of the application diagram in Figure 1
is shown. In this simulation the modulator
is connected to the output of GD16076A
via a transmission line with a characteris-
tic impedance of 25
. Finally some ther-
mal properties of GD16076A are
considered.
The Mach Zender
Interferometer.
The modulator is typically made as
shown in Figure 2. Its function is to inten-
sity modulate the incoming unmodulated
light.
In optical data transmission systems, cur-
rent modulation of the light directly in the
semiconductor laser, causes the optical
signal from the laser to have chirp (fre-
quency fluctuations of the light fre-
quency). This degrades system
performance.
Data Sheet Rev. 07
GD16076A
Page 2
VEEP
VEE
50
-5V
-5V -5V
VTT = -2V
50
1k
100nF
VREF
50
50
50
25
VCC
VCC
25
Optical
In
Modulator
Optical
Out
VDD NOUT
OUT
NDIN
DIN
Data
NData
VEEP
VSIP
VCIP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| GD16076A-50SLP | Laser Diode/LED Driver |
| GD16131-GLP | ATM Multiplexer |
| GD16132-GLP | ATM Multiplexer |
| GD4001BC | Quad 2-input NOR Gate |
| GD4001BDC | Quad 2-input NOR Gate |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| GD16076A-50SLP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Laser Diode/LED Driver |
| GD16131-GLP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ATM Multiplexer |
| GD16132-GLP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ATM Multiplexer |
| GD1626 | 制造商:Burndy 功能描述:GROUND CONNECTOR |
| GD1629 | 制造商:Burndy 功能描述:GROUND CONNECTOR |
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