The R480-Type 2.5 Gbits/s lightwave receiver is designed for use in SONET and synchronous digital hierarchy (SDH) telecommunications applications up to OC-48 and STM-16 data rates, and high-speed data communications applications. The receiver converts received optical signals in the range of 1.2 m to 1.6 m wavelength into differential CML data outputs. The receiver consists of either an InGaAs APD or PIN photodetector (depending on model selected), a transimpedance amplifier, and a limiting amplifier that provides differential CML data output. A TTL compatible link status flag signal indicates when there is a loss of optical signal. The receiver is manufactured in a low-profile, pigtailed, 24-pin plastic DIP package. It requires a single, 5.0 V power supply. The APD version has the added benefit of containing the high-voltage supply internal to the receiver. This internal supply also provides the necessary temperature compensation for the APD. An analog photodetector monitor provides a voltage proportional to the optical input level voltage (OILV).