VSC7962 查看數據表（PDF） - Vitesse Semiconductor
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VSC7962
Vitesse Semiconductor
VSC7962 Datasheet PDF : 22 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
3.125Gb/s PECL Limiting Amplifier with LOS Detect
and Laser Driver with Automatic Power Control
Advance Product Information
VSC7962
Detailed Description
The VSC7962 is a combination limiting amplifier and high-speed laser driver with Automatic Power Con-
trol (APC). The device is designed to operate up to 3.125Gb/s with a 3.3V supply. The limiting amplifier pro-
vides Loss of Signal (LOS) detect, output offset correction, and output squelch. The limiting amplifier of the
VSC7962 has PECL outputs. The VSC7962 is identical to the VSC7960 except with CML limiting amplifier
outputs. The laser driver data and clock inputs support PECL inputs as well as other inputs that meet the com-
mon mode voltage and differential voltage swing specifications. The differential pair output laser driver stage is
capable of driving up to 60mA into the laser with typical rise and fall times of 60ps. To allow for larger output
swings, the VSC7962 was designed to be AC-coupled to the laser cathode with a pull-up inductor for DC-bias-
ing. This configuration will isolate laser forward voltage from the output circuitry and will allow the output at
OUT+ to swing above and below the supply voltage VCC. The laser driver output bias and modulation currents
may be easily controlled via external circuitry. The key features of the VSC7962 are Automatic Power Control,
Loss of Signal detect, low power supply current, and fast rise and fall times.
Figure 2: Limiting Amplifier Block Diagram
TH
IN+
100Ω
IN-
RMS Power
Detect and
Control
VCC
8kΩ
VCC
8kΩ
Output Control
LOS
LOS
SQUELCH
LEVEL
OUT+
OUT-
Lowpass Filter
Offset Correction
10pF
CZ1
CZ2
Page 12
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52361-0, Rev 2.1
05/01/01
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