Analog Devices- New 2.7-GBPS Limiting Amplifier Optimized For SFF/SFP/GBIC Fiber Optic Modules

ADN2890 offers independent, on-chip SFF-8472 compliant average power measurement.

Sept 18, 2003 - Analog Devices - The ADN2890 is a small-footprint limiting amplifier specifically designed for SFF-8472 compliant fiber optic modules. The rapid adoption of these enhanced diagnostic interface specifications ensures greater module functionality, but puts additional density, cost and power constraints on optical module manufacturers. The ADN2890 limiting amplifier enables module manufacturers to meet these requirements and develop compelling solutions for the market.
The ADN2890 provides the receiver function of quantization with an input sensitivity of 6 mV p-p, which maximizes link distance and accepts differential input levels up to 2.0 V p-p. An adjustable loss of signal detection function is supplied, along with on-chip squelch control. Additionally, the limiting amplifier measures average receiver power based on direct measurement of the photodiode current with better than ±3-dB accuracy over the entire input range of the receiver, eliminating the need for external average Rx power detection circuitry.

This exceptional performance and high level of functional integration, coupled with a small 3 mm x 3 mm package size and low power dissipation (130 mW on a 3.3 V power supply), minimizes design time and manufacturing costs while enabling high module density.

Applications
Target applications for the ADN2890 include SFP/SFF/GBIC optical transceivers for OC3-OC48, GbE, 1x/2x fiber channel, as well as WDM transponders.

Pricing and Availability
Samples for the ADN2890 will be available in October 2003. It is priced at $7.00 per unit in 1,000-piece quantities.