76V, APD, Bias Output Stage with Current Monitoring

The DS1842 integrates the discrete high-voltage components necessary for avalanche photodiode (APD) bias and monitor applications. A switch FET is used in conjunction with an external DC-DC controller to create a boost DC-DC converter. A current clamp limits current through the APD and also features an external shutdown. The device also includes a dual current mirror to monitor the APD current.

Applications

* APD Biasing * GPON Optical Network Unit and Optical Line Transmission

* 76V Maximum Boost Voltage

* Switch FET

* Current Monitor with a Wide 1μA to 2mA Range, Fast 50ns Time Constant, and 10:1 and 5:1 Ratio

* 2mA Current Clamp with External Shutdown

* Multiple External Filtering Options

* 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad