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3
DBD-R2V1
Analog Technologies, Inc.
1. Set LIS = 2.5V
× I
set 4 200mA, where Ilaser is a laser set-point current. LIS can be set by the way
described in the pin description section.
2. Set LPS to a voltage value which will be generated at the LPI pin by the external TIA (Trans-
Impedance Amplifier) when the laser is outputting the protection power. The TIA converts the
current of the PD (Photo Diode) into a voltage which is fed into the LPI pin. The PD current is
generated by the laser. LPS can be set by the way described in the pin description section. Make
sure that the set-point laser current is at least 5% less than the current needed to generate the
maximum laser power.
C. Set the driver to constant power mode without over current protection
Under this mode, the laser is operating at the constant power mode unless the laser current reaches
200mA. When the laser output power reaches 200mA, the laser will be operating at a constant current
mode.
1. Connect LIS to 2.5V reference pin, or set LIS by the way described in the pin description section.
2. Set LPS to a voltage value which will be generated at the LPI pin by the external TIA (Trans-
Impedance Amplifier) when the laser is outputting the set-point power. The TIA converts the
current of the PD (Photo Diode) into a voltage which is fed into the LPI pin. The PD current is
generated by the laser. LPS can be set by the way described in the pin description section. Make
sure that the laser can output the set-point power by a current of less than 190mA.
D. Set the driver to constant power mode with over current protection
Under this mode, the laser is operating at the constant power mode unless the laser current reaches a
predetermined protection current. When the laser reaches the protection current, the laser will be operating
at a constant current mode.
1. Set LIS = 2.5V
× I
protect 4 200mA, where Iprotect is predetermined protection current. LIS can be set
by the way described in the pin description section.
2. Set LPS to a voltage value which will be generated at the LPI pin by the external TIA (Trans-
Impedance Amplifier) when the laser is outputting the set-point power. The TIA converts the
current of the PD (Photo Diode) into a voltage which is fed into the LPI pin. The PD current is
generated by the laser. LPS can be set by the way described in the pin description section. Make
sure that the laser can output the set-point power by a current of less than 95% of the protection
current.
Mounting the High Precision Digital Input Laser Driver on PCB’s
The high precision digital input laser drivers come in two types of packages: surface mount and through
hole.
The surface mount package has to be soldered manually, not by reflow oven. The through hole
package can be mounted through a socket, soldered manually, or by wave soldering machine.
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