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ACS8520 View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
'ACS8520' PDF : 150 Pages View PDF
ACS8520 SETS
ADVANCED COMMUNICATIONS
FINAL
DATASHEET
DC Characteristics: AMI Input/Output Port
(Across all operating Conditions, unless otherwise stated.)
The Alternate Mark Inversion (AMI) signal is DC balanced
and consists of positive and negative pulses with a peak-
to-peak voltage of 2.0 ±0.2 V.
There should be a symmetrical pair carrying the
composite timing signal (64 kHz and 8 kHz). The use of
transformers is recommended.
Over-voltage protection requirement: refer to
Recommendation K.41[16]
The electrical specifications are taken from option a) of
Table 2/G.703 - Digital 64 kbit/s centralized clock
interface, from ITU G.703[6].
The electrical characteristics of the 64 kbit/s interface
are as follows:
Nominal bit rate: 64 kbit/s. The tolerance is determined
by the network clock stability.
Code conversion rules:
The data signals are coded in AMI code with 100% duty
cycle. The composite clock timing signals convey the
64 kHz bit-timing information using AMI coding with a
50% to 70% duty ratio and the 8 kHz octet phase
information by introducing violations in the code rule. The
structure of the signals and voltage level are shown in
Figure 25, Figure 26 and Figure 27.
Table 40 DC Characteristics: AMI Input/Output Port
Across all operating conditions, unless otherwise stated
Parameter
Symbol
Input Pulse Width
Input Pulse Rise/Fall Time
AMI Input Voltage High
AMI Input Voltage Middle
AMI Input Voltage Low
AMI Output Current Drive
AMI Output High Voltage
Output Current = 20mA
tPW
tR/F
VIH AMI
VVIM AMI
VVIL AMI
IAMIOUT
VOH AMI
AMI Output Low Voltage
Output Current = 20mA
VOL AMI
Nominal Test Load Impedance
“Mark” Amplitude After Transformer
“Space” Amplitude After Transformer
RTEST
VMARK
VSPACE
Minimum
1.56
-
2.5
1.5
0
-
VDD - 0.16
-
-
0.9
- 0.1
Typical
7.8
-
-
1.65
-
-
-
-
110
1.0
0
Maximum
14.04
5
VDD + 0.3
1.8
1.4
20
-
0.16
-
1.1
0.1
Units
µs
µs
V
V
V
mA
V
V
V
V
Revision 3.02/October 2005 © Semtech Corp.
Page 138
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