VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
2.488GHz SONET/SDH
Clock Generator
VSC8121
Figure 8: Location of Additional Components on Back Side of the VSC8121 Evaluation Board
C5
C7
Component Values:
C3 = 0.1µF
C5 = 0.1µF
C6 = 0.1µF
C7 = 0.1µF
C6 C3
Equipment for Typical Set-up
VSC8121 Evaluation Board
Signal Generator or 155.52MHz Crystal Oscillator
Digital Oscilloscope
DC Power Supply
Power Supply Settings
VCC Set to 3.3V (Current draw will be approximately 180mA)
Reference Clock
To provide a reference clock to the VSC8121, either a Signal Generator or telecom-quality Crystal Oscilla-
tor can be used. The REFCLK level should be near 900mV(RMS) and, as listed in Table 1 of this specification,
operate at either 51.84MHz, 77.76MHz, or 155.52MHz. The evaluation board is preconfigured to run with a
155.52MHz reference clock, but can be easily modified to accept one of the other two frequency choices.
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Page 14
G52163-0, Rev 4.2
04/16/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
