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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： | 3/40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 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
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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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