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ATLS1A102 데이터시트 PDF




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부품번호 ATLS1A102 기능
기능 Low Noise Constant Current Laser Driver
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ATLS1A102 데이터시트, 핀배열, 회로
Low Noise Constant Current Laser Driver
Analog Technologies
ATLS1A102
FEATURES
Ultra Low Noise: <10µA*
High Current without Heat Sink: 1A
High Absolute Accuracy: <0.1%
www.daHtaisghheSett4aub.icloitmy: 100ppm/°C
Dual Modulation Ports: High/Low Speed
Low Drop Out Voltage: 1V
Complete Shielding
Compact Size
SMT Package Available
*Total RMS between 0.1Hz to 0.5MHz.
APPLICATIONS
Driving diode lasers with low noise, including DPSSLs,
EDFAs, fiber lasers, diode laser modules, etc.
DESCRIPTION
The ATLS1A102 is an electronic module designed for
driving diode lasers with up to 1A low noise current. The
output voltage is 1.5V to 4V when powered by a 5V power
supply.
The ATLS1A102 has two input ports for modulating the
output current: one for low speed of up to 0.08Hz bandwidth
and the other high speed modulation of up to 300KHz. The
former is for CW (Continuous Wave) operation and the
latter is for modulated operation.
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), which might be used for monitoring
and/or setting the laser current.
The shut down pin can turn the controller electronically
without disconnecting the power supply.
There is an output port, LIO (pin 11), dedicated for
monitoring the laser current. It can be connected to an ADC
or a voltmeter.
The control loop is monitored in real time by an internal
circuit, to make sure that it works properly. The monitoring
result is sent to the LPGD node (pin 12). When this pin is
pulled up internally, it indicates that the loops works fine.
By default, the maximum output current is set to 1A. This
value can be altered by external circuit which is shown in
the application section.
The ATLS1A102 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.
SDN 1 12 LPGD
GND 2 11 LIO
2P5V
LISL
3
4
10
9
VPS
PGND
19.4
P5V 5
8 LDA
LISH 6
7 LDC
14.5
Figure 1 Pin Names and Locations
The controller has 2 types of mounting packages: through hole
and surface mount. The latter saves PCB space the controller
takes.
Figure 1 is the actual size top view of the ATLS1A102D,
which shows the pin names and locations. Its thickness is 5mm.
SPECIFICATIONS
Maximum output current:
1A
Output current noise:
(0.1Hz to 0.5MHz RMS)
<10µA
Low speed current set voltage:
(on LISL pin)
0 to 2.5V
High speed current set voltage:
(on LISL pin)
0 to 0.5V
Low speed modulation cut-off frequency: 0.08Hz
High speed modulation cut-off frequency: 300KHz
Power supply voltage range:
4.5V to 5.5V
Thermal resistance:
60°C/W (free air)
30°C/W (PCB mount)
Operating temperature:
25°C to 85°C
OPERATION PRINCIPLE
Figure 2 is the block diagram of the controller.
SDN 1
GND
LISL
2
4
P5V 5
LISH 6
100nF
Low
Pass
Filter
100K
Linear
Mode
Driver
10 VPS
9 PGND
8 LDA
Laser
Diode
Control
Unit
Current
Sense
7 LDC
Figure 2 Block Diagram
55 0 E. W eddell Drive, Suit e 4 , Sunnyvale, CA 9 4089 , U. S. A . Tel.: (408) 74 7-9760 , Fax: (408 ) 7 47-977 0, Web: w w w .analogt echnologies.com
Copyrights 2000 – 2005, Analog Technologies, Inc. All Rights Reserved. Updated on 3/29/2007.
1




ATLS1A102 pdf, 반도체, 판매, 대치품
Low Noise Constant Current Laser Driver
Analog Technologies
ATLS1A102
POWER UP PROCEDURE
Laser diode is a vulnerable device. Special cautions must be
taken for turning on the controller. These are the
recommendations:
www.da1t.asHheoeltd4ut.hceomSDN pin to ground by a mechanical switch or
an electronic logic device when turning on the power on
the VPS pin and release the SDN pin to logic high after
the VPS voltage is stabilized to turn on the laser.
2. If choose not to control the SDN pin for turning on the
laser, leave the SDN pin unconnected. There is an
internal capacitor holding SDN pin to logic low. Now,
the laser can be turned on and off by using the VPS pin.
FIRST TIME POWER UP
Laser is a high value and vulnerable device. Faults in
connections and damages done to the controller during
soldering process may damage the laser permanently.
To protect the laser, it is highly recommend to use 3 regular
diodes of >1A to form a “dummy laser” and insert it in the
place of the real laser diode, when powering up the controller
for the first time. Use an oscilloscope to monitor the LDA
voltage at times of power-up and power-down, make sure
that there is not over-shoot in voltage. At the same time, use
an ammeter in serious with the dummy laser, to make sure
that the output current is correct.
After thorough checking free of faults, disconnect the
dummy laser and connect the real laser in place.
The controller output voltage range for the laser is between
0.5 to 4V when powered by a 5V power supply.
MECHANICAL DIMENSIONS AND MOUNTING
The ATLS1A102 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: ATLS1A102D, and the latter is often called SMT
(Surface Mount Technology) or SMD (Surface Mount
Device) package and has a part number: ATLS1A102S.
R1.5×4
1 12
2 11
3
4
10
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
0.8 × 2
1.5 × 14
12
14.5
Figure 7 Top Side PCB Foot-print for the DIP Package
PCB Copper
with solder pad
3.0 × 14
1.5 × 14
Figure 8 Top View of the Bottom Side PCB Foot-print
R1.5×4
1
2
3
4
5
6
12
11
10
9
19.4
8
7
5.0
2
R1.5×2
Pin size: 0.5×0.5
14.5 1.15 R1.5×2
5.6
11.5
16.8
Top View Side View
End View
Figure 9 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
55 0 E. W eddell Drive, Suit e 4 , Sunnyvale, CA 9 4089 , U. S. A . Tel.: (408) 74 7-9760 , Fax: (408 ) 7 47-977 0, Web: w w w .analogt echnologies.com
Copyrights 2000 – 2005, Analog Technologies, Inc. All Rights Reserved. Updated on 3/29/2007.
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