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