GENERAL DESCRIPTION
The ADL5315 is a wide input current range, precision high-side current mirror featuring a stable and user-adjustable input voltage. It is optimized for use with PIN photodiodes, but its flexibility and wide operating range make it suitable for a broad array of additional applications. Over the 3 nA to 3 mA range, the current sourced from the INPT pin is accurately mirrored with a 1:1 ratio and sourced from the IOUT output pin. In a typical photodiode application, the output drives a current-input logarithmic amplifier to produce a linear-in-dB output representing the optical power incident upon the photodiode.

FEATURES
   Accurately mirrors input current (1:1 ratio) over 6 decades
      Linearity 1% from 3 nA to 3 mA
   Stable mirror input voltage
      Voltage held 1 V below supply using internal reference
         or can be set externally
   Adjustable input current limit
   2.7 V to 8 V single-supply operation
   Miniature 8-lead LFCSP (2 mm × 3 mm)

APPLICATIONS
   Optical power monitoring from a single photodiode
   General voltage biasing with precision current monitoring
   Voltage-to-current conversion