TRANSPORT PRODUCTS
1 to 4 Gbps TIA
s
1 to 4 Gbps Transimpedance Amplifiers with Photocurrent Monitor
BENEFITS:
Source Terminated Differential Outputs With Linear Photocurrent Monitor
Offers Diagnostic Capabilities Without Sacrificing High Signal Integrity
On-chip Filter Provides Positive Bias to the Photodetector, Eliminating
the Need for External Components, Saving Space and Cost
Available in a TO-46 Package, Eliminating Time and Costs Associated
With the Design, Assembly and Test of the Receiver
P R O D U C T F A M I LY:
VSC7773
VSC7971
VSC7973
VSC7970
VSC7972
S P E C I F I C AT I O N S :
Input Noise: 550 nA (rms)
Supply Current: 25 mA
Sensitivity : -23 dBm (long wave) -21.5 dBm (short wave)
Max Input Current: 2.2 mA Peak to Peak Current
A P P L I C AT I O N S :
Power Dissipation: 82.5 mW
Gigabit Ethernet Transceivers
Supply Voltage: 3.3 V
Fibre Channel Transceivers (1x, 2x and 4x)
Operating Temperature from -40°C to 85°C
SONET/SDH Transceivers
SONET/SDH Transponders
4.25 Gbps Receiver Optical Sub-Assemblies
- VSC7773: TO-46 (with 850nm PIN detector)
- VSC7970: Dice or TO-46 (with 1310nm/1550nm PIN detector)
- VSC7971: Dice or TO-46 (with 1310nm/1550nm PIN detector)
- VSC7972: Dice or TO-46 (with 850nm pin detector)
- VSC7973: Dice or TO-46 (with 850nm pin detector)
F E AT U R E S :
BLOCK DIAGRAM (Die):
Single +3.3 V Supply
VSC7971
5 kΩ Differential Transimpedance
Low Power Consumption for SFP/SFF Applications
Differential Outputs with Linear Current Monitor
FILTER
10pF
500Ω
VCC
+3.3V
GND
Outputs need to
be AC-coupled
VOUTP
50Ω
IN
50Ω
Available as Bare Dice or in a 4-pin or 5-pin TO-46 Package
Monitor
VOUTN
0.1µF
0.1µF
IMON
PB-TIAFAMILY-001
1 to 4 Gbps TIAs
1 to 4 Gbps Transimpedance Amplifiers with Photocurrent Monitor
GENERAL DESCRIPTION:
The VSC7773, VSC7970, VSC7971, VSC7972, and
VSC7973 are high performance Transimpedance
Amplifiers (TIA) for Ethernet, Fibre Channel and
SONET applications. The VSC7773 support rates
from 1 Gbps to 4.25 Gbps. The other parts support rates up to 2.5
Gbps. They feature 5 kΩ differential transimpedance and 1.8 GHz
bandwidth with source-terminated differential outputs. All five parts
have a linear current monitor, adding diagnostic capabilities, and
simplifying optical alignment during the manufacturing process. A
space saving filter connection is provide for positive bias to the
photodetector through an on-chip 500Ω resistor to VCC, allowing for
easy assembly on a TO-46 header.
A P P L I C AT I O N D I A G R A M :
TO-46Receiver
Dice
VSC7959
VSC7961
Limiting
Amplifier
Monitor
CDRs
VSC8123
VSC8221
VSC8222
XCVRs
VSC8142
VSC8245
VSC8147
IMON
VSC7939
VSC7940
Laser
Driver
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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