Electronic Design

Transimpedance Amplifier Simplifies Receiver Module Design

Optimized for OC-192 and 10-Gbit Ethernet metro/access applications, the ADN2820 transimpedance amplifier (TIA) reduces receiver module complexity while driving down assembly costs. The 10-Gbits/s TIA can directly drive a clock and data recovery (CDR) IC, eliminating the need for an external post-amplifier in most short-reach/intermediate-reach optical modules for Sonet/synchronous digital hierarchy (SDH) OC-192/STM-64 and 10-Gbit Ethernet systems. The TIA provides large 5000-Ω transimpedance coupled with a low 1.1-µA input noise current. The unit's system monitoring functionality includes an analog power monitor for loss-of-power alarms. An analog signal detector supports loss-of-signal alarms and simplifies fiber alignment during assembly. Slice (offset) adjustment is also included for minimizing duty-cycle distortion. The ADN2820 operates with a 3.3-V supply and typical power dissipation of 250 mW. Available in die form, it costs $90 in 1000-piece quantities.

Analog Devices
www.analog.com; (781) 937-1428

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