TRANSPORT PRODUCTS
VSC7975, VSC7977
1/2/4 Gbps Multirate Transimpedance Amplifier
A P P L I C AT I O N D I A G R A M :
VCSEL
VSC7964
Limiting
Amplifier
and
VCSEL
Driver
Tx
Controls/Faults
Micro
Controller
Two-wire
interface
VSC7977
Receiver
Rx
F E AT U R E S :
Dual Bandwidth Selection
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
Facilitates 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
Available in a TO-46 Package, Reducing the Time and Costs Associated with the
Design, Assembly and Test of the Receiver
6kΩ Differential Transimpednace
Linear Optical Power Monitor
On-chip Photo Diode Filter
Extended Operating Temperature
Available as Bare Dice or in a 5-pin TO-46 Package
S P E C I F I C AT I O N S :
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)
A P P L I C AT I O N S :
Gigabit Ethernet Transceivers
Fibre Channel Transceivers (1x, 2x and 4x)
Infiniband Transceivers
PB-VSC7975,7977-001
VSC7975, VSC7977
1/2/4 Gbps Multirate Transimpedance Amplifier
GENERAL DESCRIPTION:
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
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.
BLOCK DIAGRAMS:
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
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
©2004 Vitesse Semiconductor Corporation
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