CWD-01-V2 Analog Technology, Inc., CWD-01-V2 Datasheet

CWD-01-V2

Manufacturer Part Number

CWD-01-V2

Description

Constant Current Cw Laser Driver

Manufacturer

Analog Technology, Inc.

Datasheet

1.CWD-01-V2.pdf (5 pages)

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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:

Pin Descriptions

Pin 1

Pin 2 LDGD, laser diode good, digital output. When this pin is high, >1V, the control loop is working

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 Vp-p noise @ 0.1 to 10 Hz

Pin 5 LCS, laser current set-point voltage, analog input. There is an input resistor of 100K tied to GND.

Pin 6 LCO, laser current output indication, analog output. 0V to 2.5V indicates the laser current of from

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

550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089, U. S. A. Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com

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 100K resistor.

and 25ppm/ C stability max.

Setting it from 0V to 2.5V will set the laser current from 0A to 2A linearly.

0A to 2A linearly.

the value is between 0.2V and 1.8V, the output voltage to the laser, Pin 9 LDA, will be 4.8V to 0V

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

3 A and 8 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.

Analog Technologies, Inc.

CONSTANT CURRENT CW LASER DRIVER

CWD-01-V2

0 to 2.5V

0.05%

3.0V to 5.5V

2.5V

0.2%

90%

20 C to +85 C

CWD-01-V2

Related parts for CWD-01-V2

CWD-01-V2 Summary of contents

Page 1

... Pin 9 LDA, will be 4. 550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089 Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com Copyrights 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. Updated: 6/18/03 CWD-01- 2.5V 0. 2.5V 0.2% 2A 0.05% 90% 3.0V to 5.5V 2. +85 C CWD-01-V2 1 ...

Page 2

... Pin 1 2 SDNG 100K 1 D MA785CT-ND 550 E. Weddell Drive, Suite 4, Sunnyvale, CA 94089 Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com Copyrights 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. Updated: 6/18/03 CWD-01- Internal chip control input 2 C 1uF Figure 1 CWD-01-V2 2 ...

Page 3

... LDA 5 LCS LCGD 6 N/C LCO GND Figure 2A Self-contained CWD-01-V2 1 SDNG VPS 2 LDGD PGND 3 GND PGND 4 2.5V LDA 5 LCS LCGD 6 LCO GND Figure 2B Micro-processor Based CWD-01- power supply GND N/C Laser 7 N power supply GND Laser 7 To ADC To signal GND 3 ...

Page 4

... Copyrights 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. Updated: 6/18/03 12 VPS 12 11 PGND 11 10 PGND 10 9 LDA 9 8 LCGD 8 7 GND 7 Figure 4 Bottom View of CWD-01-V2-S 4.6mm 3mm Figure 6 End View of CWD-01-V2-D Figure 7 End View of CWD-01-V2-S CWD-01-V2 1 2.54mm 2 3 25.5mm 4 1.26mm 5 6 18mm 20mm 4.6mm 3mm 0.42mm 18mm 4.5mm 2.26mm 1.26mm 4 ...

Page 5

... E. Weddell Drive, Suite 4, Sunnyvale, CA 94089 Tel.: (408) 747-9760, Fax: (408) 747-9770, Web: www.analogtechnologies.com Copyrights 2000 – 2003, Analog Technologies, Inc. All Rights Reserved. Updated: 6/18/03 1 Solder Pad 12 2.54mm 26mm 4 9 1.35mm Outline 17.5mm 21.5mm CWD-01-V2 2.9mm 5 ...

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