benefits: allows the user to optimize the bandwidth of the tia to the incoming optical line rate, which improves the optical input sensitivity at lower data rates and provides superior interoperability with legacy optical devices provides high gain and improved sensitivity fa cilitates an accurate measurement of the incoming optical power, enhancing the diagnostics capabilities of the system without using external components provides a positive bias to the photodetector, eliminating the need for external components supports industrial temperature applications av ailable in a to-46 package, reducing the time and costs associated with the design, assembly and test of the receiver features: dual bandwidth selection 6k ? differential transimpednace linear optical power monitor on-chip photo diode filter extended operating temperature av ailable as bare dice or in a 5-pin to-46 package applications: gigabit ethernet transceivers fibre channel transceivers (1x, 2x and 4x) infiniband transceivers 1/2/4 gbps multirate transimpedance amplifier transport products pb-VSC7975,7977-001 VSC7975, vsc7977 application diagram: specifications: input noise: 400na supply current: 30ma sensitivity at 4.25g (in oma): 18.4dbm max input current: 2.2 ma supply voltage: 3.3v operating temp: -40c to +105c (case) vcsel vsc7977 receiver vsc7964 limiting amplifier and vcsel driver micro controller two-wire interface controls/faults tx rx
for more information on vitesse products visit the vitesse web site at www.vitesse.com or contact vitesse sales at (800) vitesse or sales@vitesse.com ?2004 vitesse semiconductor corporation 1/2/4 gbps multirate transimpedance amplifier VSC7975, vsc7977 the VSC7975 and vsc7977 are multirate transimpedance amplifiers for gigabit ethernet, fibre channel, and infiniband applications. the devices provide a means for adjusting their bandwidth to allow full compliance with multiple gigabit ethernet, fibre channel, and infiniband standards. the VSC7975 and vsc7977 are equipped with a single pin that serves both as a control for bandwidth as well as a linear received optical power monitor. this allows block diagrams: general description: the device to have multirate bandwidth control, power monitoring, and differential outputs and be assembled in a standard 5-pin to- 46 package. a space-saving filter connection is provided for positive bias to the photodiode through a filter resistor to vcc. the vsc7977 is available in die form or 5-pin to-46 package with short wavelength pin photo detector. the VSC7975 is available in a 5-pin to-46 package with long wavelength pin photo detector. 741 calle plano camarillo, ca 93012, usa te l: +1 805.388.3700 fax: +1 805.987.5896 www.vitesse.com
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