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ACS8946 Datasheet(PDF) 11 Page - Semtech Corporation

Part # ACS8946
Description  Jitter Attenuating, Multiplying Phase Locked Loop, with Protection Switch, for OC-12/STM-4 and GbE
PDF  40 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

ACS8946 Datasheet(HTML) 11 Page - Semtech Corporation

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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)
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)
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)
ACS8525 alone
ACS8525 + ACS8946



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