vsc8122 Vitesse Semiconductor Corp, vsc8122 Datasheet - Page 2

• Manufacturer Part Number: vsc8122
• Description: Multi-rate Sonet/sdh Clock And Data Recovery Ic
• Manufacturer: Vitesse Semiconductor Corp

Page 2
Multi-Rate SONET/SDH
Clock and Data Recovery IC
Functional Description
Data Input
AC coupling, the network is terminated to the appropriate termination voltage, V
capacitor, C
and complement of a minimum of 250mV. These inputs are required to be AC-coupled to allow use with a vari-
ety of limiting amplifiers.
High-Speed Clock and Data Outputs
Figure 2.
The data input receiver is internally terminated by a center-tapped resistor network. For differential input
The VSC8122 high-speed clock and data outputs can be DC-terminated, 50 Ω to V
Limiting Amp
AC
to ground. The input requires a differential signal with a peak-to-peak voltage on both the true
CO+ / DO+
CO- / DO-
Figure 2: High-Speed Clock and Data Output DC Termination
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
VSC8122
Tel: (800) VITESSE • FAX: [phone] • Email: [e-mail]
Figure 1: Input Termination (AC-Coupled)
VITESSE
100Ω
100Ω
SEMICONDUCTOR CORPORATION
V
V
CC
CC
Internet: www.vitesse.com
Z
Z
o
o
= 50Ω
= 50Ω
Z
Z
o
o
= 50Ω
= 50Ω
0.1 µF
0.1 µF
C
AC
DI+
DI-
50Ω
V
50Ω
TERM
VSC8122
V
V
CC
TERM
CC
50Ω
50Ω
through a blocking
CC
as indicated in
VSC8122
Data Sheet
G52228-0, Rev 4.1
01/05/01