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PDF ATLS1A101 Data sheet ( Hoja de datos )
| Número de pieza | ATLS1A101 | |
| Descripción | Low Noise Constant Current Laser Driver | |
| Fabricantes | AT | |
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Analog
Technologies
Low
Noise
Constant
Current
Laser Driver
ATLS1A101
FEATURES
Ultra Low Noise: <6µA*
High Output Current: 1A
High Absolute Accuracy: <0.1%
www.datasheet4u.com
High Stability: 100ppm/°C
Dual Modulation Ports: High/Low Speed
Complete Shielding
Compact Size
SMT Package Available
*Total RMS between 0.1Hz to 2MHz.
APPLICATIONS
Drive laser diodes with low noise, including DPSSL, EDFA,
fiber laser, direct diode lasers, etc.
DESCRIPTION
The ATLS1A101 is an electronic module designed for
driving diode lasers with low noise current of up to 1A.
The ATLS1A101 can be modulated by an external signal.
There are two modulation ports for the input signal, one for
high speed modulation and the other for low speed.
The controller can drive a 1A laser diode of 2V to 3V
without using a heat sink. When driving a 1A laser diode of
<2V, additional heat sinking is needed.
The output current can be set linearly by an input voltage
and monitored linearly by an output voltage at the same
time.
A high stability low noise 2.5V reference voltage is
provided internally for setting the output current. This
reference can also be as the voltage reference for external
ADCs (Analog to Digital Converters) and DACs (Digital to
Analog Converters).
The ATLS1A101 is packaged in a 6 sided metal enclosure,
which blocks EMIs (Electro-Magnetic Interferences) to
prevent the controller and other electronics from interfering
each other.
The controller has 2 types of packages: through hole mount
and surface mount. The latter saves PCB space the
controller takes.
AGND 1 12 VPS
2P5V 2 11 PGND
LILM
LISL
3
4
10
9
LDC
LDA 19.4
P5V 5 8 LPGD
LISH 6 7 SDN
14.5
Figure 1 Pin Names and Locations
Figure 1 is the actual size top view of the ATLS1A101, which
shows the pin names and locations.
APPLICATIONS
Figure 2 shows a stand-alone application circuit, where W1
sets the current limit and the output current at the same time. It
is recommended that the current limit is set to 1.1 times of the
output current. S1 is the shut down switch. The internal
equivalent input circuit of SDN pin is a pull-up resistor of
100K being connected to VPS. If choose not to use a switch
(S1) to control the laser, leave the SDN pin unconnected. D1 is
the laser diode, which is float from the ground and the VPS,
with its anode connected to the LDA, pin 9, and cathode
connected to the LDC, pin 10. D2 is an LED, indicating when
the control loop works properly, that is: the output current
equals to the input set value. If choose not to use an LED for
indicating the working status, leave the LPGD pin
unconnected. Adjusting W1, set input voltages of LILM, pin 3,
and LISL, pin 4, and the current limit and the output current
will respectively be:
I_limit = 1.1*LILM(V)/2.5V (A),
I_output = LISL(V)/2.5V (A).
LILM and LISL should never be left float. Otherwise, the
output current will go too high a value and the laser might be
damaged.
In addition to using the LPGD pin for monitoring the working
status of the controller, the output current can be monitored
directly by measuring the voltage of LDC pin. The equation is:
I_out = LDC(V)/0.5V (A).
For example, when seeing LDC = 0.25V, the output current is
0.25V/0.5V = 0.5A.
Figure 3 shows an application where ATLS1A101 is interfaced
with a micro-controller. In this circuit, the input current can be
set by a DAC (Digital to Analog Converter), the current limit
can either be set by a POT (Potentiometer), a pair of resistors,
or the same DAC. The output current can now be monitored by
an ADC (Analog to Digital Converter). By sensing the logic
level of LPGD, pin 8, the working status of the controller can
be monitored by a micro-controller (MC), when it is 1, the loop
is good; 0, the loop is at fault, which includes open circuit at
the laser diode connections, or short circuit at the LDC pin to
ground. Shut down pin can also be controlled by the micro-
controller, setting it to 1 turns on the controller, 0 off. Please
notice that this pin comes with an internal pull up resistor of
100K, it can be ORed by multiple digital ports of several
micro-controllers, with each of the port having an open-drain
output. The internal voltage reference output, 2P5V, pin 2, can
be used as the reference voltage for the ADCs and the DACs.
Figure 4 shows the equivalent input circuits of different pins.
Understanding the internal equivalent circuits well helps
designing external circuitries.
5 50 E. Weddell Drive, Suit e 4, Sunnyvale, CA 94 08 9, U. S. A. Tel.: (4 08 ) 7 47 -9 76 0, Fax: (40 8) 74 7-97 70 , W eb: w w w .analogt echnologies.com
© Copyrights 2000 – 2005, Analog Technologies, Inc. All Rights Reserved.
1
1 page  
Analog
Technologies
Low
Noise
Constant
Current
Laser Driver
ATLS1A101
9 LDA
www.datasheet4u.com
10 LDC
11 PGND
12 VPS
output
Power
output
Analog
output
Power
ground
Power
input
control loop is working properly. When this pin is low, <0.3V, an LED directly, without
the laser diode is bad, or there is a short or open circuit at the using any additional
laser diode connection.
components.
This pin drives the anode of the laser diode.
This pin drives the cathode of the laser diode. It has the same
voltage potential as the LISH pin.
Never short this pin to any
other pins, otherwise, the
laser may be damaged.
Connect this pin directly to power supply return node (0V).
Power supply input. The driver works under VPS = 4.8V to
5.5V.
MECHANICAL DIMENSIONS AND MOUNTING
The ATLS1A101 comes in 2 packages: through hole
mount and surface mount. The former is often called DIP
(Dual Inline package) or D (short for DIP) package and has
a part number: ATLS1A101−D, and the latter is often
called SMT (Surface Mount Technology) or SMD (Surface
Mount Device) package and has a part number:
ATLS1A101−S.
R1.5×4
1 12
2 11
3 10
4 9 19.4
58
67
2
14.5
R1.5×2
R1.5×2
Pin size: 0.5×0.5
12
5.0 Top View Side View
4.0
End View
Figure 6 Dimensions of the DIP Package Controller
R1.5 × 4
Orientation Mark
PCB Copper
without solder pad
PCB Hole
Outline
2 × 14
19.4
1.0 × 12
12
14.5
0.8 × 2
1.5 × 14
Figure 7 Top Side PCB Foot-print for the DIP Package
PCB Copper
with solder pad
3.0 × 14
1.5 × 14
Figure 7 Top View of the Bottom Side PCB Foot-print
R1.5×4
1
2
3
4
5
6
14
13
12
11 19.4
10
9
5.0
2
14.5 1.15
R1.5×2
R1.5×2
Pin size: 0.5×0.5
5.6
11.5
16.8
Top View Side View
End View
Figure 8 Dimensions of the SMT Package Controller
Figure 7 shows the foot print which is seen from the top
side of the PCB, therefore, it is a “see through” view.
Please notice that, in the recommended foot print for the
DIP package, the holes for pin 2 to 6, and 8 to 12 have
larger holes than needed for the pins. This arrangement
will make it easier for removing the controller from the
PCB, in case there is a rework needed. The two smaller
holes, for pin 1 and 7, will hold the controller in the right
position.
5 50 E. Weddell Drive, Suit e 4, Sunnyvale, CA 94 08 9, U. S. A. Tel.: (4 08 ) 7 47 -9 76 0, Fax: (40 8) 74 7-97 70 , W eb: w w w .analogt echnologies.com
© Copyrights 2000 – 2005, Analog Technologies, Inc. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ATLS1A101.PDF ] | |
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