GENERAL DESCRIPTION
●The ADN2830 provides closed loop control of the average optical power of a continuous wave (CW) laser diode (LD) after initial factory setup. The control loop adjusts the laser Ibias to maintain a constant Back-Facet Monitor Photo Diode (MPD) current and hence a constant laser optical
●power. The external PSET resistor is adjusted during factory setup to set the desired optical power. RPSET is set at 1.23/IAV, where IAVis the MPD current corresponding to the desired optical power. Programmable alarms are provided for laser fail (end of life), and laser degrade (impending fail).
●To provide monitoring of the MPD current, the MPD can be connected to the IMPD pin. In this case the MPD current is mirrored to the IMPDMON pin to provide a monitor, and internally to the PSET pin to close the control loop. By closing the feedback using IBMON rather than an MPD
●connected to PSET , the device is configured to control a constant current in the laser rather than a constant optical output power.
●FEATURES
●Bias Current range 4mA to 200 mA
●Monitor Photo Diode current 50uA to 1200uA
●Closed loop control of Average Power
●Laser fail and laser degrade alarms
●Automatic laser shutdown, ALS
●Full current parameter monitoring
●5 V operation
●-40"C to 85"C Temperature Range
●5mm x5mm 32 pin LFCSP package
●APPLICATIONS
●Fiber Optic Communication
