参数资料
型号: ACS8946T
厂商: Semtech
文件页数: 3/40页
文件大小: 0K
描述: IC JITTER ATT MULT PLL 48-QFN
标准包装: 1
类型: 时钟/频率发生器,多路复用器
PLL:
主要目的: 以太网,SONET/SDH
输入: LVPECL
输出: CML,LVPECL
电路数: 1
比率 - 输入:输出: 2:4
差分 - 输入:输出: 是/是
频率 - 最大: 625MHz
电源电压: 3.135 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-VFQFN 裸露焊盘
供应商设备封装: 48-QFN(7x7)
包装: 托盘
ADVANCED COMMUNICATIONS
FINAL
DATASHEET
Revision 3/November 2006 Semtech Corp.
Page 11
www.semtech.com
ACS8946 JAM PLL
Characteristic is defined solely by the loop filter
bandwidth and is shown in Figure 5, which shows the
transfer characteristic using the recommended loop filter
bandwidth of 2 kHz with a damping factor of 1.2.
Figure 5 Jitter Transfer Characteristic, ACS8946
Stand-alone
In the combined solution, the ACS8525 device provides
additional low frequency jitter filtering. The Jitter Transfer
Characteristic of the combined ACS8946 and ACS8525 is
shown in Figure 6.
Figure 6 Jitter Transfer Characteristic, ACS8525 and
ACS8946 combined
Phase Noise Performance
The inherent jitter generation by the ACS8946 is shown in
the phase noise plot in Figure 7 measured on a
155.52 MHz output clock using an input reference of
19.44 MHz.
Figure 7 Phase Noise Offset from Carrier of ACS8946
622.08 MHz output clock
In the combined line card solution, the inherent jitter
generated by the ACS8525 is attenuated by the ACS8946
as shown in the phase noise plot in Figure 8.
Figure 8 Phase Noise Offset from Carrier, ACS8525
155.52 MHz output clock, with and without ACS8946
Clock Cleaner
Lock Detector
A simple lock detector is incorporated which combines the
plus and minus phase errors from the phase detector,
TBIL
ACS8944 RMS Jitter Transfer Curve
-27.0
-24.0
-21.0
-18.0
-15.0
-12.0
-9.0
-6.0
-3.0
0.0
3.0
100
1000
10000
100000
Frequency (Hz)
H(
s
)d
B
ACS8946 RMS Jitter Transfer Curve
TBIL
-160
-140
-120
-100
-80
-60
-40
-20
0
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
Frequency (Hz)
P
h
ase
Noise
(
d
B
c
/Hz
)
Typical Phase Noise @ 155.52MHz
TBIL
Typical Phase Noise Cleaning of ACS8525
-170
-150
-130
-110
-90
-70
-50
-30
-10
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
1.0E+08
Frequency (Hz)
P
h
a
s
e
N
o
is
e
(d
B
c
/H
z
)
ACS8525 alone
ACS8525 + ACS8946
相关PDF资料
PDF描述
ACS8947T IC JITTER ATT MULT PLL 48-QFN
AD10200BZ IC ADC DUAL 12BIT 68-CLCC
AD10242BZ IC ADC DUAL 12BIT 68-CLCC
AD10465BZ IC ADC DUAL 14BIT 68-CLCC
AD13280AZ IC ADC 12BIT 68CLCC
相关代理商/技术参数
参数描述
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:
ACS9510EVB 功能描述:EVALUATION BOARD FOR ACS9510 RoHS:是 类别:编程器,开发系统 >> 评估演示板和套件 系列:ToPSync™ 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口,收发器,PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板
ACS9510T 制造商:Semtech Corporation 功能描述: