VITESSE
SEMICONDUCTOR CORPORATION
Advance Product Information
VSC7809
Features
• Integrated Photodetector/Transimpedance
Amplifier Optimized for High-Speed Optical
Communications Applications
• Fibre Channel/Gigabit Ethernet Compatible
• High Bandwidth
Bandwidth
(MHz)
800
Photodetector/Transimpedance Amplifier
Family for Optical Communication
• Low Input Noise Equivalent Power
• Large Optically Active Area
• Single 3.3V Power Supply
Part Number
VSC7809
Data Rate
1.25Gb/s
Input Noise
(
µ
W rms)
1.4
Optically Active Area
(
µ
m diameter)
100
General Description
The VSC7809 integrated Photodetector/Transimpedance Amplifier provides a highly integrated solution
for converting light from a fiber optic communications channel into a differential output voltage. The benefits
of Vitesse Semiconductor’s Gallium Arsenide H-GaAs process are fully utilized to provide very high bandwidth
and low noise in a product with a large optically active area for easy alignment. The sensitivity, duty cycle dis-
tortion and jitter meet or exceed all Fibre Channel and Gigabit Ethernet application requirements. Parts are
available in either die form, flat-windowed packages or in ball-lens packages.
By using a metal-semiconductor-metal (MSM) photodetector with a monolithic integrated transimpedance
amplifier, the input capacitance is lowered which allows for a larger optically active area than in discrete photo-
detectors. Integration also allows superior tracking over process, temperature and voltage between the photode-
tector and the amplifier, resulting in higher performance. This part can easily be used in developing Fibre
Channel Electro-Optic Receivers which exhibit very high performance and ease of use.
VSC7809 Block Diagram
Photodetector/Transimpedance Amplifier
+3.3V
DOUTP
DOUTN
GND
Both DOUTP and DOUTN are back-terminated to 25Ω.
G52195-0, Rev 2.4
04/05/01
©
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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VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
