ADN2830

连续波激光器的平均电源控制器 Continuous Wave Laser Average Power Controller

GENERAL DESCRIPTION

The 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