Figure 4 Jitter Transfer Cha" />
參數(shù)資料
型號(hào): ACS8944T
廠商: Semtech
文件頁(yè)數(shù): 22/24頁(yè)
文件大?。?/td> 0K
描述: IC JITTER ATT MULT PLL 48-QFN
標(biāo)準(zhǔn)包裝: 1
類(lèi)型: 時(shí)鐘/頻率發(fā)生器,多路復(fù)用器
PLL:
主要目的: SONET/SDH
輸入: LVPECL
輸出: LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/是
頻率 - 最大: 155.52MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 48-QFN(7x7)
包裝: 管件
ADVANCED COMMUNICATIONS
FINAL
DATASHEET
Revision 3/November 2006 Semtech Corp.
Page 7
www.semtech.com
ACS8944 JAM PLL
Figure 4 Jitter Transfer Characteristic, ACS8944
Stand-alone
In the combined solution, the ACS8525 device provides
additional low frequency jitter filtering. The jitter transfer
characteristic of the combined ACS8944 and ACS8525 is
shown in Figure 5.
Figure 5 Jitter Transfer Characteristic, ACS8525 and
ACS8944 combined
Phase Noise Performance
The inherent jitter generation by the ACS8944 is shown in
the phase noise plot in Figure 6 for a PLL bandwidth of
2 kHz, output frequency of 155.52 MHz and input of
19.44 MHz.
Figure 6 Phase Offset from Carrier, ACS8944
In the combined line card solution, the inherent jitter
generated by the ACS8525 is attenuated by the ACS8944
as shown in the phase noise plot in Figure 7, which uses
a PLL bandwidth of 2 kHz.
Figure 7 Phase Offset from Carrier, ACS8525
with/without ACS8944
Loop Filter Components
The loop filter comprises two identical sets of passive RC
components that connect to the differential charge pump
outputs and internal VCO control inputs. Pins VCN and
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
-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 + ACS8944
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