TRANSPORT PRODUCTS
VSC7978
9.9 Gbps – 11.3 Gbps High Gain Transimpedance Amplifier for TO-Can Based ROSA Applications
BENEFITS:
Lowest Cost 10 Gbps ROSA Solution Designed Specifically
for High Volume XFP Module Applications
S P E C I F I C AT I O N S :
Transimpedance Gain 4k ohm Differential
F E AT U R E S :
TO-46 Can Compatible Die Size
4k ohm Differential Transimpedance Gain
Low Power, 140mW typ.
Photodetector Cusrrent Monitor Voltage Output
Single +3.3V Power Supply
Integrated Photo Detecotor Bias Circuit
Low Frequency Cutoff 30kHz
Overload Current 4.5mA
Limiting Output 360mV Differential
3dB Bandwidth in a TO-46 Can 8GHz
NOTE: All Specifications are Typical
BLOCK DIAGRAM:
PB-VSC7978-001
VSC7978
9.9 Gbps – 11.3 Gbps High Gain Transimpedance Amplifier for TO-Can Based ROSA Applications
GENERAL DESCRIPTION:
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.
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.
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
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