VSC6108 查看數據表（PDF） - Vitesse Semiconductor

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VSC6108

Low Jitter Clock Multiplier and Distributor

Vitesse Semiconductor 

VITESSE

SEMICONDUCTOR CORPORATION

Low Jitter

Clock Multiplier and Distributor

Advance Product Information

VSC6108/10/12

Three versions of the clock multiplier and distributor IC are available.

1. The VSC6108 has a VCO frequency of 1.6 GHz and can output clocks at 800 MHz, 400 MHz, 200 MHz,

and 100 MHz.

2. The VSC6110 has a VCO frequency of 2.0 GHz and can output clocks at 1 GHz, 500 MHz, 250 MHz, and

125 MHz.

3. The VSC6112 has a VCO frequency of 2.488 GHz and can output clocks at 1.244GHz, 622 MHz, 311MHz,

and 155MHz.

VCO multiplication and output division ratios are user-selectable. Each of the ICs can be configured for an

input frequency of 1/4, 1/8, 1/16, or 1/32 of the VCO frequency as shown in Table 1 below. The output frequen-

cies are selected as shown in Table 2 below.

Table 1: Input Frequency vs. Mode

Mode Name

fVCO = fIN * 4

fVCO = fIN * 8

fVCO = fIN * 16

fVCO = fIN * 32

FISEL1

0

0

1

1

FISEL0

0

1

0

1

VSC6108

400 MHz

200 MHz

100 MHz

50 MHz

fIN

VSC6110

500 MHz

250 MHz

125 MHz

62.5 MHz

VSC6112

622 MHz

311 MHz

155 MHz

77.5 MHz

Table 2: Output Frequency vs. Mode

Mode Name

fOUT = fIN

fOUT = fVCO / 2

fOUT = fVCO / 4

fOUT = fVCO / 8

fOUT = fVCO / 16

FOSEL2

0

0

0

0

1

FOSEL1

0

0

1

1

0

FOSEL0

0

1

0

1

0

VSC6108

fIN

800 MHz

400 MHz

200 MHz

100 MHz

fOUT

VSC6110

fIN

1 GHz

500 MHz

250 MHz

125 MHz

VSC6112

fIN

1.244GHz

622 MHz

311 MHz

155 MHz

Page 2

© VITESSE SEMICONDUCTOR CORPORATION

741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896

G52224-0, Rev 2.1

2/15/99

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