The ADN2892 is a high gain, limiting amplifier optimized for use in fibre channel and GbE optical receivers. The ADN2892 accepts input levels of up to 2.0Vp-p differential and has 3 mVp-p differential input sensitivity. The ADN2892 provides receiver functions of quantization and loss of signal (LOS) detection.

The ADN2892 has an on-chip selectable filter to reduce the BW of the limamp to 1.5GHz in order to filter out the relaxation oscillation of legacy 1Gb/s fiber channel transmitters with CD lasers. The reduced BW will also allow for more optical Rx sensitivity margin at the lower data rates such as 1xFC and 1GbE in multi-rate modules.

The limiting amplifier also measures average received power based on a direct measurement of the photodiode current with better than 1dB of accuracy over the entire input range of the receiver. This eliminates the need for external average Rx power detection circuitry in SFF-8472 compliant optical transceivers.

The ADN2892 limiting amplifier operates from a single 3.3V supply, has low power dissipation, and is available in a spacesaving 3 x 3 mm 16-lead lead frame chip scale package (LFCSP).