ACS8520T Semtech, ACS8520T Datasheet - Page 140

• Manufacturer Part Number: ACS8520T
• Description: Synchronous Equipment Timing Source (SETS) for Stratum 3/4E/4 and SMC Systems
• Manufacturer: Semtech

Figure 27 Recommended Line Termination for AMI Output/Output Ports
Note...The AMI inputs I1 and I2 should be connected to the external AMI clock source by 470 nF coupling capacitor C1.
The AMI differential output T08POS/T08NEG should be coupled to a line transformer with a turns ratio of 3:1.
Components C2 = 470 pF and C3 = 2 nF. If a transformer with a turns ratio of 1:1 is used, a 3:1 ratio potential
divider R
Jitter Performance
Output jitter generation measured over 60 second interval, UI p-p max measured using C-MAC E2747 12.800 MHz
TCXO on ICT Flexacom tester.
Table 41 Output Jitter Generation
Revision 3.02/October 2005 © Semtech Corp.
ADVANCED COMMUNICATIONS
G813
G813
G813
G812
[11]
[11]
[11]
[10]
for 155 MHz o/p option 1
& G812
for 155 MHz o/p option 2
for 1.544 MHz o/p
load
AMI input
signal
AMI input
signal
must be used to achieve the required 1 V p-p voltage level for the positive and negative pulses.
Specification
[10]
for 2.048 MHz option 1
Test Definition
C1
C1
I1
I2
65 kHz - 1.3 MHz
20 Hz - 100 kHz
12 kHz - 1.3 MHz
12 kHz - 1.3 MHz
12 kHz - 1.3 MHz
12 kHz - 1.3 MHz
12 kHz - 1.3 MHz
12 kHz - 1.3 MHz
10 Hz - 40 kHz
TO8POS
TO8NEG
Filter
FINAL
Page 140
C2
4 Hz
4 Hz
18 Hz
8 Hz
4 Hz
2.5 Hz
1.2 Hz
0.6 Hz
4 Hz
Bandwidth
Turns
ratio
3:1
19 MHz
2.048 MHz 8k lock
19 MHz
19 MHz
19 MHz
19 MHz
19 MHz
19 MHz
1.544 MHz 8k lock
Conditions
R
I/P Freq
load
Direct lock
8k lock
Direct lock/
8k lock
Direct lock/
8k lock
Direct lock/
8k lock
Direct lock/
8k lock
Direct lock/
8k lock
Direct lock/
8k lock
Lock Mode
C3
AMI output signal
to external devices
GND
F8530D_023AMI_lineterm_04
ACS8520 SETS
0.1 p-p
0.05 p-p
0.1 p-p
0.1 p-p
0.1 p-p
0.1 p-p
0.1 p-p
0.1 p-p
0.05 p-p
Jitter Spec
UI
DATASHEET
www.semtech.com
0.067 p-p
0.065 p-p
0.012 p-p
0.072 p-p
0.072 p-p
0.078 p-p
0.078 p-p
0.078 p-p
0.076 p-p
0.006 p-p
ACS8520 Jitter
UI (TYP)