DS1842A Datasheet | Maxim Integrated

19-4994; Rev 0; 10/09 KIT ATION EVALU LE B A IL A AV 76V, APD, Bias Output Stage with Current Monitoring General Description Features - 76V Maximum Boost Voltage - Switch FET - Current Monitor with a Wide 1µA to 2m A Range, Fast 50ns Time Constant, and 10:1 and 5:1 Ratio - 2m A Current Clamp with External Shutdown - Precision Voltage Feedback - Multiple External Filtering Options - 3mm x 3mm, 14-Pin TDFN Package with Exposed Pad The DS1842A integrates the discrete high-voltage ponents 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. Applications APD Biasing GPON ONU and OLT PART DS1842AN+ DS1842AN+T&R Ordering Information TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 14 TDFN-EP- 14 TDFN-EP- +Denotes a lead(Pb)-free/Ro HS-pliant package. T&R = Tape and reel. - EP = Exposed pad. Typical Application Circuit 3.3V LX FBIN CBULK DS1842A SW GATE PGND FBOUT R2 CP R P P D2 CLAMP CURRENT LIMIT MIROUT ROSA MIR1 R1 MIRIN .. CURRENT MIRROR MIR2 EXTERNAL MONITOR EP GND DS1875 APD TIA MON3 NOTE: SEE THE LAYOUT CONSIDERATIONS SECTION. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at...