SE1031W

SE1031W LightCharger™ 2.5 Gb/s Transimpedance Amplifier LP Final Applications § § § § § SONET/SDH-based transmission systems, test equipment and modules OC-48 fibre optic modules and line termination ATM over SONET/SDH Gigabit Ethernet Fibre Channel Product Description SiGe Semiconductor offers a portfolio of optical networking ICs for use in high-performance optical transmitter and receiver functions, from 155 Mb/s up to 12.5 Gb/s. SiGe Semiconductor’s SE1031 is a fully integrated, silicon bipolar transimpedance amplifier; providing wideband, low noise preamplification of signal current from a photodetector. It features differential outputs, and incorporates an automatic gain control mechanism to increase dynamic range, allowing input signals up to 2.6 mA peak. A decoupling capacitor on the supply is the only external circuitry required. A system block diagram is shown after the functional description, on page 3. Noise performance is optimized for 2.5 Gb/s operation, with a calculated rms noise based -10 sensitivity of –26 dBm for 10 bit error rate, achieved using a detector with 0.5 pF capacitance and a responsivity of 0.9 A/W, with an infinite extinction ratio source. Features § § § § § Single +3.3 V power supply Power dissipation = 110 mW (typ) Input nois e current = 360 nA rms when used with a 0.5 pF detector Transimpedance gain = 2.3 kΩ into a 50 Ω load (differential) On-chip automatic gain control gives input current overload of 2.6 mA pk and max output voltage swin...