VSC7961
Data Sheet
3.125Gb/s PECL Limiting Amplifier with LOS Detect
F
EATURES
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A
PPLICATIONS
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+3.3V or +5V Power Supply
Typical Supply Current of 31mA
Positive Emitter-Coupled Logic Outputs
Optional Output Squelch
Loss of Signal Detect
Output Offset Correction
Typical Rise/Fall Times of Faster than 100ps
TSSOP-16 and 24-Pin QFP-N Package, and Bare Dice
SONET/SDH at 155Mb/s, 622Mb/s, 1.244Gb/s,
2.488Gb/s, and 3.125Gb/s
Full-Speed Fibre Channel (1.062Gb/s/2.124Gb/s)
Small Form Factor Receivers
ATM Optical Receivers
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ENERAL
D
ESCRIPTION
The VSC7961 is a single-supply limiting amplifier with Loss of Signal (LOS) detect for SONET/SDH and Fibre
Channel applications up to 3.125Gb/s. The VSC7961 provides a constant output signal swing for a wide range of
input voltages and has positive emitter-coupled logic (PECL) outputs. The VSC7959 provides the same functionality
as the VSC7961 with current-mode logic (CML) outputs. Key features of the VSC7961 are its rms power detectors
for programmable LOS detection, optional output squelch, excellent jitter performance, and fast edge rates. The
VSC7961 is available in die form, a TSSOP-16 package, or a 24-pin QFP-N package.
VSC7961 Block Diagram
VSC7961
V
CC
8kΩ
V
CC
TH
R
TH
rms Power Detect
and
Control
0.01µF
0.01µF
IN+
IN-
100Ω
SQUELCH
Output
Control
LEVEL
OUT+
OUT-
50Ω
Lowpass Filter
10pF
50Ω
V
CC
- 2V
Offset Correction
CZ1
0.1µF
G52360, Rev 4.0
5/15/03
©
VITESSE SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
LOS
8kΩ
LOS
V
CC
V
CC
- 2V
CZ2
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VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
