General Description

The DS1842A integrates the discrete high-voltage components necessary for avalanche photodiode (APD) bias and monitor applications. A switch FET and precision voltage-divider network are 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 precision voltage-divider network is provided for precise control of the APD bias voltage. The device also includes a dual current mirror to monitor the APD current.

Features

♦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

♦Precision Voltage Feedback

♦Multiple External Filtering Options

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