ADL5317

www.DataSheet4U.com Avalanche Photodiode Bias Controller and Wide Range (5 nA to 5 mA) Current Monitor ADL5317 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) FUNCTIONAL BLOCK DIAGRAM 16 15 14 13 COMM FALT 1 COMM COMM COMM ADL5317 OVERCURRENT PROTECTION THERMAL PROTECTION CURRENT MIRROR 5:1 NC 12 APPLICATIONS Optical power monitoring and biasing in APD systems Wide dynamic range voltage sourcing and current monitoring in high voltage systems VSET 2 30 × VSET IPDM 11 29 × R IAPD 5 3 VPLV VPHV VPHV 5 R IAPD VCLH 6 NC 10 4 GARD 7 VAPD 8 GARD 9 Figure 1. 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 ...