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Copyrights 2000-2021, Analog Technologies, Inc. All Rights Reserved. Updated on 3/11/2021
Email: [email protected]/[email protected] 5
Analog Technologies
ATLS1A102
Low Noise Constant Current Laser Driver
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: ATLS1A102
−
D, and the latter is often called SMT
(Surface Mount Technology) or SMD (Surface Mount
Device) package and has a part number: ATLS1A102
−
S.
19.4
1
3
4
5
6
2
12
10
9
8
7
11
14.5
R1.5
×
4
2
R1.5
×
2
Top View Side View
End View
5.0
12
Pin size: 0.5
×
0.5
4.0
R1.5
×
2
Figure 6. Dimensions of the DIP Package Controller
19.4
1.5
×
14
1.0
×
12
0.8
×
2
12
14.5
2
×
14
R1.5
×
4
PCB Copper
without solder pad
PCB Hole
Orientation Mark
Outline
Figure 7. Top Side PCB Foot-print for the DIP Package
3.0
×
14
1.5
×
14
PCB Copper
with solder pad
Figure 8. Top View of the Bottom Side PCB Foot-print
Top View Side View
End View
5.6
16.8
Pin size: 0.5
×
0.5
R1.5
×
2
R1.5
×
4
19.4
14.5
1
3
4
5
6
2
12
10
9
8
7
11
1.15
2
R1.5
×
2
11.5
5.0
Figure 9. Dimensions of the SMT Package Controller
Figure 10 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.
