Camarillo, Calif.--Oct. 20, 1997-Vitesse Semiconductor Corporation introduced four new transimpedance amplifiers for use in Synchronous Digital Hierarchy (SDH) optoelectronic telecommunications systems.
The VSC7902 and VSC7903 are designed for 155 Mb/s operation while theVSC7911 and VSC7912 are for 622 Mb/s data rates. Two amplifiers areoffered at each data rate to meet both single-ended and differentialoutput configurations. All of the amplifiers are designed for use withcommercially available long wavelength optical detectors.
This series of transimpedance amplifiers provides highly integratedsolutions for converting the current produced by a photodiode into avoltage suitable for digital data recovery. To adjust automatically forvarying signal strengths while maintaining very stable, low jitterperformance, requires a highly sensitive, high-gain broadband amplifierintegrated with Automatic Gain Control (AGC). Gain Control minimizesamplifier distortion and is critical in meeting the low jitterrequirements of SDH applications. It also allows the amplifiers tooperate in systems that utilize a broad range of optical link lengths.
SDH specifications place stringent demands on high-bandwidthoptoelectronic amplifiers. Availability of these amplifiers has beenlimited because only specialized microwave analog Gallium Arsenide (GaAs)technologies have been capable of meeting the required performance. Suchprocesses are designed to fabricate simple circuits on small wafers andare typically low-yielding, leading to limited availability and a highunit price.
Single power supply operation and internally terminated outputs simplifysystem design. The wide operating temperature range (-40 degrees C to +85 degrees C), makes these amplifiers useablein all telecommunications applications. They are supplied in die formto facilitate a low capacitance connection to the photodiode, thereby maintainingsystem bandwidth and sensitivity. Pricing per unit for 10,000 units is$8.00 for the VSC7902 and VSC7903, and $25.00 for the VSC7911and VSC7912. Samples are available now.
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