lda1-cp2 Analog Technology, Inc., lda1-cp2 Datasheet

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lda1-cp2

Manufacturer Part Number
lda1-cp2
Description
Dual Mode Laser Driver
Manufacturer
Analog Technology, Inc.
Datasheet
FEATURES
High Efficiency: ≥90%
Maximum Output Current: 2A
No Heat Sink Required
Current and Power Programming, Modulation & Monitoring
Capabilities.
Current Output Noise: 0.05%
High Stability: 100ppm/°C
Zero EMI
Compact Size
DIP Package Available
APPLICATIONS
DPSSL, EDFA, and instrumentation diode lasers.
DESCRIPTION
The LDA1-CP2 is an electronic module designed for driving
diode lasers (N type) with well controlled and monitored
driving current and output laser power. Its PWM (Pulse
Width Modulation) output stage achieves ≥90% high power
efficiency, eliminating the need for a heat sink. The output
current and laser power can be set linearly by two separate
input voltages and monitored linearly at the same time by
two output voltages respectively. It comes with a high
stability low noise 2.5V reference voltage which can be used
for setting the output current and as voltage references for
external ADCs and DACs.
LDA1-CP2 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 LDA1-CP2 physical photo is shown in Figure 1. Figure
2 is the actual size top view of the LDA1-CP2, which shows
the pin names and locations. Its thickness is 4.6mm. The
LDA1-CP2 pin functions are shown in table 1.
Table 1 Pin Function Descriptions
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 – 2009, Analog Technologies, Inc. All Rights Reserved. Updated on 9/11/2009
Pin #
1
2
3
4
5
Analog Technologies
Pin Name
2.5VREF
CLPGD
SDNG
P/CM
GND
Pin Type
Analog
Analog
ground
Digital
Digital
output
output
Signal
output
input
Shut down control. Negative logic, at the internal chip control input: >2.3V = enable,
<0.5V = shut down, normal threshold voltage = 1.2V. Its internal circuit is shown in
Figure 3 above. The diode is for shortening the shut down time.
Control loop good indication. A HI level indicates control loop locked. This pin is an
open drain output and pulled up by a 20K resistor to VPS.
Power/current mode indication. HI = power mode, LO = current mode. Low output
impedance, capable of driving 20mA load.
Signal ground pin. Connect ADC and DAC grounds to here.
Reference voltage. It is used by the internal DACs as the reference voltage. It can source
3mA max, with 5μVp-p noise @ 0.1 to 10 Hz and 25ppm/°C stability max.
Description
2.5VREF
Figure 2 Pin Names and Locations
CLPGD
SDNG
P/CM
GND
LIO
LPS
Dual Mode Laser Driver
LIS
Figure 3 Internal Shut down Circuit
Figure 1 Physical Photo
1
2
3
4
5
6
7
8
20.0
10
16
15
14
13
12
11
9
VPS
PGND
PGND
LDA
PDA
GND
SYNCO
LPO
LDA1-CP2
25.4
1

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lda1-cp2 Summary of contents

Page 1

... EMIs (Electro-Magnetic Interferences) to prevent the controller and other electronics from interfering each other. The LDA1-CP2 physical photo is shown in Figure 1. Figure 2 is the actual size top view of the LDA1-CP2, which shows the pin names and locations. Its thickness is 4.6mm. The LDA1-CP2 pin functions are shown in table 1. ...

Page 2

... LIS (pin 6)). For example, if 200mA NOC 0.05% RMS@2A is needed for outputting a desired laser power of 100mW, set 2 ms the laser driver to output 240mA current, i.e., set 100 μs 3.0 ~ 6.0 V LIS = 2.5V × 0.24A/2A = 0.3V. 2 °C Dual Mode Laser Driver LDA1-CP2 = 2.5V – ≤ 1V). LPO PDA PDA 2 ...

Page 3

... If you have an optical power meter, check the output power if see if it matches the desired the power. If not, adjust R1 till the output laser power equals the desired value. Measure of the output current after this step, set the protection current to 1.2 times of this current, i.e., set LDA1-CP2 3 ...

Page 4

... The TIA converts the current of the power- sensing PD (Photo Diode) into a voltage, with the gain set by an external resistor connected between the PDA and GND pins. Make sure that the laser can output the set-point power by a current of less than 95% of the protection current. LDA1-CP2 4 ...

Page 5

... Copyrights 2000 – 2009, Analog Technologies, Inc. All Rights Reserved. Updated on 9/11/2009 Dual Mode Laser Driver Figure 7 Side View of LDA1-CP2-D Figure 8 End View of LDA1-CP2-D Figure 6 shows top view of LDA1-CP2-D, therefore “see through” view. Figure 7 shows side view of LDA1-CP2-D. Figure 8 shows end view of LDA1-CP2-D. ...

Page 6

... E. Weddell Drive, Suit e 4, Sunnyvale Tel Fax .analogt echnologies.com  Copyrights 2000 – 2009, Analog Technologies, Inc. All Rights Reserved. Updated on 9/11/2009 Description PCs 50 ~ 199 PCs $98 $85 Dual Mode Laser Driver LDA1-CP2 200 ~ 999 PCs ≥ 1000 PCs $79 $69 6 ...

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