Hi.
I have two noobish questions about the DDL circuit as a driver for a LD.
1 - As far as I can tell, the DDL only has leads connected to the laser anode and cathode, and the photodiode is not used. Is this because the current regulation capability of the DDL enables precise LD output power setting, which then obviates the need for the photodiode feedback? Thanks for helping me understand this.
2 - My project has a main circuit board located 3 inches from the LD. I'm thinking of locating the entire DDL circuit on a new main board and using 3 inches of 22awg wire to carry the DDL output power to the LD. If this is completely inadvisable, maybe someone can say so and explain why?
Power supply = 2 x 14500 rechargeable protected lithium cells, each is 3.6v nominal, or 4.1v peak when fresh off the charger.
LD is 10mw 904nm, 25 to 70mA op-current range, 1.8 to 2.5 op-voltage range.
The objective is to operate the LD at the lower end of its output power range, ie probably drawing only 30mA or so.
Thanks!
I have two noobish questions about the DDL circuit as a driver for a LD.
1 - As far as I can tell, the DDL only has leads connected to the laser anode and cathode, and the photodiode is not used. Is this because the current regulation capability of the DDL enables precise LD output power setting, which then obviates the need for the photodiode feedback? Thanks for helping me understand this.
2 - My project has a main circuit board located 3 inches from the LD. I'm thinking of locating the entire DDL circuit on a new main board and using 3 inches of 22awg wire to carry the DDL output power to the LD. If this is completely inadvisable, maybe someone can say so and explain why?
Power supply = 2 x 14500 rechargeable protected lithium cells, each is 3.6v nominal, or 4.1v peak when fresh off the charger.
LD is 10mw 904nm, 25 to 70mA op-current range, 1.8 to 2.5 op-voltage range.
The objective is to operate the LD at the lower end of its output power range, ie probably drawing only 30mA or so.
Thanks!