Date: 24/11/2009

Avalanche Photo Diode biasing IC from Maxim for GPON optical networks

Maxim has introduced the DS1842, a new 76V Avalanche PhotoDiode (APD) bias output stage and current-monitoring IC designed using Maxim's BiCMOS process that integrates the discrete high-voltage components necessary for APD bias and monitor applications. The DS1842 is suitable for APD biasing and current monitoring in GPON Optical Network Unit (ONU) and Optical Line Transmission (OLT).

A switch FET is used in conjunction with an external DC-DC controller to create a boost DC-DC converter. The device also includes a dual current mirror to monitor the APD current.

The key features of the DS1842 IC are,

Current monitor with a 1µA to 2mA range
Fast 50ns time constant, and 10:1 and 5:1 ratio
2mA current clamp with external shutdown
Multiple external filtering options

Operating temperature range: -40°C to +85°C

Package: 3mm x 3mm, 14-pin TDFN package
Price: Starts at $0.90 for 1k pieces
Availability: Now

For more details visit www.maxim-ic.com