![]() ![]() If I used the first way (voltage), and the answer to #3 involves using an LM7905, would the voltages from the DAC lines need to be negative too? One way is with a microcontroller, and using two of its DAC lines to essentially set the desired laser output. On the ADN2873, it looks like there are two basic ways to configure it.If #1='Yes', what do I need to do differently to hookup the ADN2873? Would I need to use something like an LM7905 to get a negative voltage, and then essentially change all GND's to V- and all V+ to GND in the schematics from the ADN2873 data sheet?.If #1='No', should I look for a different laser pin-out, or a different laser driver?.Will this laser configuration work with ADN2873?.I have found ADN2873 (datasheet on Mouser or Analog Device's website) - but all of the schematics I see seem to be for a different laser configuration (V+ applied to laser anode, GND to laser cathode). Since I am wanting to transmit data, I believe that I want a laser driver in the mix. ![]() ![]() Pin 2 - Common case (laser anode, monitor cathode)įrom what I have read, I should ground Pin 2 because it is tied to the case, which means that Pin 1 would need to be tied to negative voltage in some way.It is the same basic pin layout - just 850 nm. I would probably switch to an OPV314Y once I was comfortable that the laser circuit was functioning. I'm really only using this laser because it is in the visible spectrum, and I assume it would be easier to learn with if I could actually see a beam. This D650-5i laser diode has a built in monitor diode. I am wanting to experiment with transmitting data over air via lasers. ![]()
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