參數(shù)資料
型號: ACS8946T
廠商: Semtech
文件頁數(shù): 3/40頁
文件大?。?/td> 0K
描述: IC JITTER ATT MULT PLL 48-QFN
標準包裝: 1
類型: 時鐘/頻率發(fā)生器,多路復(fù)用器
PLL:
主要目的: 以太網(wǎng),SONET/SDH
輸入: LVPECL
輸出: CML,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 2:4
差分 - 輸入:輸出: 是/是
頻率 - 最大: 625MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-QFN(7x7)
包裝: 托盤
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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