CWD-01-V2 Datasheet, PDF (1/5 Pages) List of Unclassifed Manufacturers – CONSTANT CURRENT CW LASER DRIVER

Analog Technologies, Inc.
CWD-01-V2
CONSTANT CURRENT CW LASER DRIVER
Description
This laser driver is for driving diode lasers with high stability and high power efficiency. It provides these
functions: laser constant current control, laser current monitoring, control loop stability indications, and
shut down. It provides a high stability and low noise 2.5V reference voltage which can be used for setting
the output current, or for ADCs & DACs.
Main features: high efficiency, low noise, high reliability, zero EMI and small package.
Part number:
Laser current control signal level:
Control accuracy:
Laser current indication signal level:
Indication accuracy:
Maximum output current:
Current output noise:
Laser driver efficiency:
Power input DC voltage:
Output reference voltage:
Operating temperature:
CWD-01-V2
0 to 2.5V
±0.2%
0 to 2.5V
±0.2%
2A
0.05%
≥90%
3.0V to 5.5V
2.5V
−20°C to +85°C
Pin Descriptions
Pin 1 SDNG, shut down control, digital input. Negative logic, at the internal chip control input: >1.4V
= enable, <0.95V = shut down, norminal threshold voltage = 1.2V. The input current is between
3µA and 8µA. There is a resistor, a Schottky diode, and a capacitor circuit in front of the internal
input pin. See Figure 2. This circuit allows a slow start up and a quick shut down.
Pin 2 LDGD, laser diode good, digital output. When this pin is high, >1V, the control loop is working
properly. When this pin is low, <1V, the laser diode is bad, or there is a short or open circuit at the
laser diode. This pin comes from an open drain output and is pulled up by a 100KΩ resistor.
Pin 3 GND, signal ground. Connect ADC and DAC grounds to here.
Pin 4 2.5V, reference voltage, analog output. It can source 3mA max, with 5µVp-p noise @ 0.1 to 10 Hz
and 25ppm/°C stability max.
Pin 5 LCS, laser current set-point voltage, analog input. There is an input resistor of 100K tied to GND.
Setting it from 0V to 2.5V will set the laser current from 0A to 2A linearly.
Pin 6 LCO, laser current output indication, analog output. 0V to 2.5V indicates the laser current of from
0A to 2A linearly.
Pin 7 GND, the same as PIN 3.
Pin 8 LCGD, laser current good, control loop indication, analog output. When this pin is stabilized and
the value is between 0.2V and 1.8V, the output voltage to the laser, Pin 9 LDA, will be 4.8V to 0V
550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: [phone], Fax: [phone], Web: www.analogtechnologies.com
© Copyrights 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. Updated: 6/18/03
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