ACS8520 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8520' PDF : 150 Pages View PDF
ACS8520 SETS
ADVANCED COMMUNICATIONS
FINAL
Figure 27 Recommended Line Termination for AMI Output/Output Ports
DATASHEET
AMI input
signal
I1
C1
AMI input
signal
I2
C1
TO8POS
TO8NEG
Turns
ratio
3:1
C2
Rload
AMI output signal
to external devices
C3
GND
F8530D_023AMI_lineterm_04
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 Rload must be used to achieve the required 1 V p-p voltage level for the positive and negative pulses.
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
Test Definition
Conditions
Jitter Spec ACS8520 Jitter
Specification
G813[11] for 155 MHz o/p option 1
G813[11] & G812[10] for 2.048 MHz option 1
G813[11] for 155 MHz o/p option 2
G812[10] for 1.544 MHz o/p
Filter
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
Bandwidth I/P Freq Lock Mode
UI
4 Hz
19 MHz Direct lock 0.1 p-p
8k lock
4 Hz
2.048 MHz 8k lock
0.05 p-p
18 Hz
19 MHz
Direct lock/ 0.1 p-p
8k lock
8 Hz
19 MHz Direct lock/ 0.1 p-p
8k lock
4 Hz
19 MHz Direct lock/ 0.1 p-p
8k lock
2.5 Hz
19 MHz
Direct lock/ 0.1 p-p
8k lock
1.2 Hz
19 MHz
Direct lock/ 0.1 p-p
8k lock
0.6 Hz
19 MHz
Direct lock/ 0.1 p-p
8k lock
4 Hz
1.544 MHz 8k lock
0.05 p-p
UI (TYP)
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
Revision 3.02/October 2005 © Semtech Corp.
Page 140
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