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VSC7969
Data Sheet
3.125Gb/s Integrated Transimpedance and Limiting Amplifier with Signal Detect
F
EATURES
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PPLICATIONS
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Integrated TIA and Limiting Amplifier
Low Power Consumption for SFF Applications
TO Package-Compatible Layout
On-Chip Signal Detect
On-Chip Linear Photocurrent Monitor
Single 3.3V Supply
5V Supply Operation via Wirebond Option
Compatible with PIN or Avalanche Detectors
Packages: Bare Die and TO-46 (with photodetector)
2.488Gb/s, 3.125Gb/s SONET OC-48/SDH STM-16
2.125Gb/s Fibre Channel
2.5Gb/s or 3.125Gb/s Ethernet Applications with
8B/10B Overhead
SFF Transceivers
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G
ENERAL
D
ESCRIPTION
The VSC7969 is a 3.125Gb/s transimpedance amplifier IC with a built-in limiting amplifier, a signal detect feature
and a photocurrent monitor. The VSC7969 does not require any external electrical components in the construction of
a high performance optical receiver such as for SONET/SDH applications. The analog output is a differential signal
with a minimum amplitude of 200mVp-p (single-ended). The VSC7969 operates with a single power supply with a
maximum power dissipation of 300mW. A PIN photodiode or Avalanche Photodetector (APD) can be connected and
separately biased to provide optimal performance.
The VSC7969 provides filtered bias for MSM and PIN photodetectors; applications using an APD must supply bias
separately. The VSC7969 also provides a photocurrent monitor whose output is linearly proportional to the input
photocurrent.
The VSC7969 can operate from a single +3.3V or +5V supply. The VSC7969 is offered in die form and a fully tested
TO-46 outline packaged receiver with a photodetector.
VSC7969 Block Diagram
VCCS
Filter
10pF
500Ω
+3.3V
Regulator
+5V
+3.3V
VCCD
GND
Dual power supply pins are
provided for +5V or +3.3V
operation. Only one power
supply pin should be connected.
50Ω
In
50Ω
VOUTP
VOUTN
Signal
Detect
Outputs need to
be AC-coupled
0.1µF
0.1µF
SD_OUT
SD_ADJ
VSC7969
Monitor
IMON
G52355, Rev 2.3
11/22/02
©
VITESSE
SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
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