Low-Power Amplifier with AGC Targets WDM Systems

Claimed as an industry first, the MAX3861 low-power amplifier with automatic gain control (AGC) is specifically designed for WDM transmission systems using optical amplifiers. Operating from a single +3.3V supply, this AGC amplifier linearly amplifies or attenuates the input signal to a fixed output voltage swing in a fully differential approach. Both the input and output are on-chip terminated to match 50½ lines. The AGC amplifier accepts differential or single-ended current-mode logic (CML) input data at rates up to 2.7Gbps. The differential output swing can be adjusted between 400 mV to 920 mV (typ.) over a 46 dB input dynamic range. Variation in output swing is controlled to within 0.5 dB over a 16 dB input variation. The MAX3861 provides a received-signal-strength indicator (RSSI) that is linear within 5% for input signal levels up to 100 mVp-p and a loss-of-signal indicator with programmable threshold. Available in a 24-pin QFN package with exposed pad, prices start at $14.25/1,000. Evaluation kits are available. MAXIM INTEGRATED PRODUCTS INC., Sunnyvale, CA. (800) 998-8800.