Analog Technologies ATLS1A102 Quick Start Manual

Analog Technologies
FEATURES
Ultra Low Noise: <10µA @0.1Hz to 10Hz
P-P
High Current without Heat Sink: 1A
High Absolute Accuracy: <0.1%
High Stability: 10ppm/°C
Dual Modulation Ports: High/Low Speed
Low Drop Out Voltage: 1V
Complete Shielding
Compact Size
100 % lead (Pb)-free and RoHS compliant
DIP and SMT Package Available
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.
1161 Ringwood Ct, #110, San Jose, CA 95131, U. S. A. Tel.: (408) 748-9100, Fax: (408) 770-9187
Copyrights 2000-2021, Analog Technologies, Inc. All Rights Reserved. Updated on 3/11/2021
Low Noise Constant Current Laser Driver
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
Parameter
Maximum output current
Output current noise
(0.1Hz to 10Hz)
Low speed current set voltage
(on LISL pin)
High speed current set voltage
(on LISL pin)
Low speed modulation cut-off
frequency
High speed modulation cut-off
frequency
Power supply voltage range
Thermal resistance
Operating case temperature
Rise times of small signal
Fall times of small signal
Rise times of large signal
Fall times of large signal
OPERATION PRINCIPLE
Figure 2 is the block diagram of the controller.
SDN
1
GND
2
LISL
4
P5V
5
LISH
6
Email: staff@analogti.com/sales@analogti.com
ATLS1A102
SDN 1 LPGD
12
LIO
GND
2 11
2P5V VPS
3 10
19.4
LISL PGND
4 9
P5V LDA
5 8
LDC
LISH
6 7
14.5
Value
1
<10
0~2.5
0~2.5
0.08
300
4.5~5.5
60 (free
air)
30 (PCB
mount)
−25~85
1.5
1
1.5
1
10
100KΩ
100nF
9
Linear
Low
Mode
Pass
8
Driver
Filter
Current
Control
7
Sense
Unit
Figure 2. Block Diagram
www.analogtechnologies.com
Unit/Note
A
µA
P-P
V
V
Hz
kHz
V
°C/W
°C
µS
µS
µS
µS
VPS
PGND
LDA
Laser
Diode
LDC
1