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参数资料
| 型号： | ACS8946 |
| 元件分类： | 数字传输电路 |
| 英文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, QCC48 |
| 封装： | 7 X 7 MM, QFN-48 |
| 文件页数： | 15/40页 |
| 文件大小： | 663K |
| 代理商： | ACS8946 |
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ADVANCED COMMUNICATIONS
FINAL
DATASHEET
Revision 3/November 2006 Semtech Corp.
Page 22
www.semtech.com
ACS8946 JAM PLL
Applications
The ACS8946 is targeted at applications requiring clock
cleaning, where input jitter is filtered out or attenuated at
frequencies above the ACS8946 PLL bandwidth, and at
those requiring protection switching. It also performs the
function of a clock multiplying unit (CMU) translating from
one common spot frequency to one of six spot
frequencies (and/or odd divisions thereof) independently
on each of its four outputs.
The ACS8946 can save space when compared with
discrete analog + VCXO solutions or module-based
solutions. In the example in Figure 12 the ACS8946 is
shown symbolically as a line card dejittering and clock
multiplying device, providing additional jitter cleaning and
frequency translation of the output clocks from a Semtech
Line Card Protection device.
Figure 13 shows a non-specific example schematic which
represents a generic line card design, and demonstrates
the I/O connections, configuration controls on the device
and the appropriate terminations in different
CML/LVPECL technologies, with only the parts relevant to
the handling of clocks being shown. This example could
be used as a solution for less stringent applications where
the ACS8946 could carry out the basic clock protection
function in place of a Semtech Line Card Protection
device, although it could not, for example, perform group
(Clock and Sync) switching, frequency monitoring, or other
functions available with members of the Semtech LC/P
family of parts.
Application Diagram
Figure 12 Typical Application for Semtech JAM PLLs
Multiple Line cards
Primary Ref.
Input/
output
Master Sync Card
Slave Sync Card
uP/Serial Bus
SSM
Priorities
TCLK
CLK
SEC
Master Clock
DATA
Priorities
Config.
Input CLK Sources
Line
I/F
Unit
SetsLinecardGenApp_11
To/from
SONET/SDH/PDH
Network
FRAMER
SERDES
Line Card (0C-12)
Master Clock
Recovered Clock
Sync
Slave Clock
Backplane
Low Jitter/Low Skew
Low Jitter spot frequencies to 625.00 MHz
Sync
4 x Programmable Clocks
JAM PLL with
PROTECTION
SWITCH
SETS
Output
CLKs
ACS8946
ACS8510
ACS8520
ACS8522
ACS8530
Clock
Distribution
SSM Processing
Slave Clock
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ACS8946EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for OC-12/STM-4 and GbE |
| ACS8946T | 功能描述:IC JITTER ATT MULT PLL 48-QFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ACS8947T | 功能描述:IC JITTER ATT MULT PLL 48-QFN RoHS:是 类别:集成电路 (IC) >> 时钟/计时 - 专用 系列:- 标准包装:1,500 系列:- 类型:时钟缓冲器/驱动器 PLL:是 主要目的:- 输入:- 输出:- 电路数:- 比率 - 输入:输出:- 差分 - 输入:输出:- 频率 - 最大:- 电源电压:3.3V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:带卷 (TR) 其它名称:93786AFT |
| ACS9010 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| ACS9510/50EVB | 制造商:Semtech Corporation 功能描述: |
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