9.9 Gbps – 11.3 Gbps High Gain Transimpedance Amplifier for TO-Can Based ROSA Applications

VSC7978

GENERAL DESCRIPTION:

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

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

Vitesse, ASIC-Friendly, FibreTimer, TimeStream and Snoop Loop are trademarks of Vitesse Semiconductor Corporation.

All other trademarks or registered trademarks mentioned herein are the property of their respective holders. Vitesse

Semiconductor Corporation ("Vitesse") retains the right to make changes to its products or specifications to improve

performance, reliability or manufacturability. All information in this document, including descriptions of features,

functions, performance, technical specifications and availability, is subject to change without notice at any time.

The VSC7978 is a 9.9 Gbps – 11.3 Gbps high performance,

low power transimpedance amplifier designed for use in

TO-46 Can based Receiver Optical Sub Assemblies (ROSA)

for optical communication networks; SONET/SDH (OC-

192/STM-64), 10G Ethernet, 10G Fiber Channel and OTN

applications. The device is intended for use with a PIN

photo detector or APD, and is capable of amplifying input currents of up to and

greater than 3.5mAp-p with low duty-cycle distortion. The VSC7978 offers

4kohm differential transimpedance, eliminating the need for an additional post-

amplifier. The outputs limit to a typical differential value of 300mVp-p,

increasing the dynamic range of the system by reducing the possibility of

exceeding the input voltage range of the transceiver device. A space-saving

filter connection is provided for a positive bias to the photo detector through a

50ohm resister to external VCCPD. The VSC7978 operates at 3.3V power supply

and is offered as bare die form.