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A nalog 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:CWD-01-V2Laser current control signal level: 0 to 2.5VControl accuracy: ± 0.2%Laser current indication signal level: 0 to 2.5VIndication accuracy: ± 0.2%Maximum output current:2ACurrent output noise: 0.05%Laser driver efficiency: ā„ 90%Power input DC voltage: 3.0V to 5.5V Output reference voltage:2.5VOperating temperature: ā 20 ° C to +85 ° C Pin DescriptionsPin 1 SDNG , shut down control, digital input. Negative logic, at the internal chip control input: >1.4V= enable, <0.95V = shutdown, norminal threshold voltage = 1.2V. The input current is between3 µ A and 8 µ A. 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 workingproperly. 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 100K ā¦ 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 5 µ Vp-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 andthe 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.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com ļ£© Copyrights 2000 2003, Analog Technologies, Inc. All Rights Reserved. Updated: 6/18/03 1
