ACS8515 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'ACS8515' PDF : 50 Pages View PDF
ACS8515 Rev2.1 LC/P
ADVANCED COMMUNICATIONS
Figure 4. Minimum Input Jitter Tolerance (DS1/E1)
(for inputs supporting G.783 compliant sources)
Peak-to-peak jitter and wander amplitude (log
scale)
A1
FINAL
A2
Jitter and wander frequency (log sc
f1
f2
f3
f4
Table 7. Amplitude and Frequency values for Jitter Tolerance
(for inputs supporting G.783 compliant sources)
Ty p e
Spec.
Amplitude
(UI pk-pk)
Fr eq u en cy
(Hz)
A1
A2 F1 F2
F3
F4
DS1
G R - 1 24 4 - C O R E
5
0.1 10 500 8k
40k
E1
ITU G.823
1.5
0.2 20 2.4k 18k 100k
High Speed Output Clock
Frame Sync and Multi-Frame Sync Clocks
The O1 SEC clock is supplied on a PECL/LVDS
port with spot frequencies of;
•19.44 MHz,
•38.88 MHz,
•155.52 MHz,
•311.04 MHz,
•Dig 1.
(where Dig 1 is 1.544 MHz (SONET)/2.048 MHz
(SDH), and multiples of 2, 4 and 8 depending
on SONET/SDH mode setting).
The actual frequency is selectable via the
cnfg_differential_outputs register. The O1 port
can also support 311.04 MHz, which is enabled
via the cnfg_T0_output_enable register. The O1
port can be made LVDS or PECL compatible via
the cnfg_differential_outputs register.
Frame Sync (8 kHz) and Multi-Frame Sync (2
kHz) clocks will be provided on outputs FrSync
and MFrSync. The FrSync and MFrSync clocks
have a 50:50 mark/space ratio.
Low Jitter Multiple E1/DS1 Outputs
This feature added to Rev2.1 is activated using
the cnfg_control1 register. This sends a fre-
quency of twice the Dig2 rate (see reg addr 39h,
bits 7:6) to the APLL instead of the normal
77.76MHz. For this feature to be used, the Dig2
rate must only be set to 12352kHz/16384kHz
using the cnfg_T0_output_frequencies register.
The normal OC3 rate outputs are then replaced
with E1/DS1 multiple rates. The E1(SONET)/
DS1(SDH) selection is made in the same way as
for Dig2 using the cnfg_T0_output_enable reg-
ister. Table 9 shows the relationship between
primary output frequencies and the correspond-
ing output in E1/DS1 mode, and which output
they are available from.
Revision 2.01/December 2005 Semtech Corp.
12
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