The R485-Type 2.5 Gbits/s lightwave receiver is designed for use in SONET OC-48 and synchronous digital hierarchy (SDH) STM-16 telecommunications applications 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 data and clock outputs. The receiver consists of either InGaAs APD or PIN photodetector (depending on model selected), a transimpedance amplifier, a limiting amplifier, and a clock and data recovery IC (CDR). The CDR uses PLL technology to extract the clock signal from the converted optical signal. 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.