The SA5223 is a wideband variable gain transimpedance amplifier fabricated in Philips 1mm “QUBiC” BiCMOS technology. The device is primarily intended for Synchronous Optical Network (SONET) / (OC3) or the International Telecommunications Union, (ITU) Synchronous Transmission Module (STM) applications using NRZ or RZ data format at 155MB/s. The SA5223 has a spectral noise current density of 1.2pA//Hz with an electrical dynamic range of 105dB. A Bit Error Rate (BER) of 10-10 is obtainable for an optical input level of -36dBmWAVG.