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

©2003 Vitesse Semiconductor Corporation

741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

The VSC7999 and VSC7979 are 10.7 Gb/s - 12.5 Gb/s high performance,

low power transimpedance amplifiers designed for use in optical

communication systems. The devices are intended for use with a PIN

or an APD photodetector, and are capable of amplifying input currents

over 2.5 mA with low duty-cycle distortion and with little total jitter

change. The VSC7999 and VSC7979 offer 9kohm and 3kohm differential

transimpedance respectively, eliminating the need for an additional

post-amplifier. The outputs limit to a typical differential value of

600mVp-p, increasing the dynamic range of the system by reducing the

possibility of exceeding the input voltage range of the transceiver

device. The VSC7999 and VSC7979 also allow compensation for fiber

non-linearities such as dispersion and EDFA non-linearity.

APPLICA TION DIAGRAMS:

GENERAL DESCRIPTION:

11.3 Gb/s Transimpedance Amplifiers with Photocurrent Monitor and Input Slicing Adjust

VSC7979,VSC7999

Laser

300-Pin, 200-Pin Transponder

Drivers

VSC7983 - EML

VSC7984 - EML

VSC7992 - RZ

VSC8473

CRU/DEMUX/

MUX/CMU

VSC8477

Adaptive XCVR

VSC9271

10G

FEC/PM

10 Gb/s Receiver

Photo

Detector

TIA

VSC7999

VSC7979

uC

Laser

10 Gb/s Receiver

Photo

Detector

TIA

VSC7999

VSC7979

uC

XFP Transceiver

VSC8473

VSC8477

10G SONET

XCVRs

0-12é FR4

VSC8233

Dual Signal

Conditioner

Post Amp +

CDR

CDR+CU

equalization

XFI

Drivers

VSC7983 - EML

VSC7984 - EML