Description
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 µm to 1.6 µm 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.

FEATUREs
■ Multisourced footprint
■ Internal APD bias supply
■ Differential data and clock outputs
■ APD and PIN versions
■ Typical sensitivity:
   —APD, –32 dBm
   —PIN, –23 dBm
■ Operation at 1.3 µm or 1.55 µm
■ TTL link status flag
■ Wide operating case temperature range:
   —APD, 0 °C to +70 °C
   —PIN, –40 °C to +85 °C
■ Space-saving, self-contained, 24-pin DIP
■ Agere Systems Inc. Reliability and Qualification Program for built-in quality
■ SONET/SDH compatible for OC-48/STM-16 data rate

APPLICATIONs
■ Telecommunications
   — Inter- and intraoffice SONET/SDH
   — Subscriber loop
   — Metropolitan area networks
■ High-speed data communications