GENERAL DESCRIPTION

The ADL5317 is a high voltage, wide dynamic range, biasing and current monitoring device optimized for use with avalanche photodiodes. When used with a stable high voltage supply (up to 80 V), the bias voltage at the VAPD pin can be varied from 6 V to 75 V using the 3 V-compatible VSET pin. The current sourced from the VAPD pin over a range of 5 nA to 5 mA is accurately mirrored with an attenuation of 5 and sourced from the IPDM monitor output. In a typical application, the monitor output drives a current input logarithmic amplifier to produce an output representing the optical power incident upon the photodiode. The photodiode anode can be connected to a high speed transimpedance amplifier for the extraction of the data stream.

FEATURES

Accurately sets avalanche photodiode (APD) bias voltage

Wide bias range from 6 V to 75 V

3 V-compatible control interface

Monitors photodiode current (5:1 ratio) over six decades

Linearity 0.25 from 10 nA to 1 mA, 0.5 from 5 nA to 5 mA

Overcurrent protection and overtemperature shutdown

Miniature 16-lead chip scale package (LFCSP 3 mm × 3 mm)

APPLICATIONS

Optical power monitoring and biasing in APD systems

Wide dynamic range voltage sourcing and current

monitoring in high voltage systems