550 E. W eddell D rive, Su ite 4 , Sunnyva le, CA 94089 , U. S. A . Tel.: (408 ) 747 -9760 , Fax : (408 ) 747 -9770 , W eb: www .analogtechnologies.com
© Copyright 2000 – 2003, Analog Technologies, Inc. All Rights Reserved.
1
DBD-R2V1
Analog Technologies, Inc.
Dual Mode Bi-directional Dual Input Laser Driver
Main features: dual control mode, bi-directional output, dual input mode (analog & digital), high
precision, high reliability, and small package.
Part number:
DBD-R2V1
Maximum output current on LDA and LDC: 200mA
Output voltage range on LDA:
0.8V
8V
Output voltage range on LDC:
-0.8V
-8V
Laser current and power control accuracy:
14bit
Laser current control resolution:
48.8
µA/step
Laser power control resolution:
0.024%/step
Laser current & power digital control signal: TTL, serial
Laser current set-point voltage:
0 to 2.5V
Laser power set-point voltage:
0 to 2.5V
Laser current and power indication voltage:
0 to 2.5V
Laser current indication absolute accuracy:
±0.2%
Current output noise:
0.1% RMS
Soft-start rise time:
0.1 S
Power input DC voltage:
4.75V to 5.25V
Operation mode:
CC (Constant Current) and CP (Constant Power)
Operating temperature:
-20
°C to +85°C
Module dimension:
25.5mm
× 20 mm × 4.5mm
Pin Descriptions
Pin 1
SD, shut down, digital input, positive logic, >2.3V = shut down, <0.5V = enable, normal
threshold voltage = 1V. The input current is between
−1µA and 1µA. It is pulled down by a 20K
resistor to ground.
Pin 2
CLGD, control loop good indication, digital output. The maximum output current is 10mA. A HI
level indicates control loop locked.
Pin 3
GND, signal ground pin. Connect ADC and DAC grounds to here.
Pin 4
2.5V, reference voltage, analog output. It is used by the internal DACs as the reference voltage. It
can source and sink 5mA current with a maximum 20ppm/
°C stability max.
Pin 5
LIS, laser current set-point voltage, analog input. 0V to 2.5V sets the output current from 0 to
200mA linearly. The input impedance of this pin is 20K
Ω. This pin can be set by an external
analog signal source, such as the output of a closed-loop op-amp, POT, or DAC, or set by the
internal DAC B and leave LPS pin unconnected. The internal DAC is connected to the reference
voltage 2.5V, so that its full scale is 2.5V.
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