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參數(shù)資料
| 型號： | VSC8121QI |
| 廠商： | VITESSE SEMICONDUCTOR CORP |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | 2.488GHz SONET/SDH Clock Generator |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, HEAT SPREADER, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 1/18頁 |
| 文件大小： | 176K |
| 代理商： | VSC8121QI |
VITESSE
Data Sheet
VSC8121
2.488GHz SONET/SDH
Clock Generator
G52163-0, Rev 4.2
04/16/01
Page 1
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Features
Monolithic Phase Locked Loop
General Description
The VSC8121 is a monolithic Phase Locked Loop (PLL) based clock generator designed for telecommuni-
cations systems operating at 2.5Gb/s. The VSC8121 incorporates a reactance-based (LC) Voltage Controlled
Oscillator (VCO) with low phase noise. The PLL’s loop filter is on-chip.
The device has a differential 2.488GHz CML clock output (CO/CON) signal, a single-ended TTL low-
speed clock (LSCLK) output equivalent in frequency to that of the reference clock, and a TTL reference clock
input selectable for 51.84MHz, 77.76MHz or 155.52MHz. TTL inputs REFSEL[0:1] are used to make this
selection.
A clean REFCLK signal is required since jitter below the PLL loop bandwidth, which is present on the
REFCLK input, will appear on the output. Jitter on REFCLK at frequencies above the loop bandwidth will be
attenuated by the PLL. The state of REFSEL[0:1] will select which frequency is expected on the REFCLK
input.
VSC8121 Functional Block Diagram
On-Chip LC Oscillator
On-Chip Loop Filter
TTL/CMOS Reference Clock
Selectable Reference
Jitter Meets SONET OC-48 and
SDH STM-16 Requirements
High-Speed CML Clock Output
Single 3.3V Supply
Compact 10mm x 10mm 44 Pin PQFP Package
REFCLK
LSCLK
CO
CON
Ph.Freq.
Detector
Loop
Filter
CLOCK
OUT
VCO
Divider
REFSEL[0:1]
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VSC8121 | 2.488GHz SONET/SDH Clock Generator |
| VSC8122 | Multi-Rate SONET/SDH Clock and Data Recovery IC |
| VSC8122QP | Multi-Rate SONET/SDH Clock and Data Recovery IC |
| VSC8123 | 10Mb/s to 2.7Gb/s Rate Agile, Adaptive Clock and Data Recovery |
| VSC8124 | Target Specification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VSC8122 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:Multi-Rate SONET/SDH Clock and Data Recovery IC |
| VSC8122QP | 制造商:Vitesse Semiconductor Corporation 功能描述: |
| VSC8123 | 制造商:VITESSE 制造商全稱:Vitesse Semiconductor Corporation 功能描述:10Mb/s to 2.7Gb/s Rate Agile, Adaptive Clock and Data Recovery |
| VSC8123RB | 制造商:Vitesse Semiconductor Corporation 功能描述: |
| VSC8123RD | 制造商:Vitesse Semiconductor Corporation 功能描述: |
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