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
