ACS8582 Semtech Corporation, ACS8582 Datasheet - Page 26

• Manufacturer Part Number: ACS8582
• Manufacturer: Semtech Corporation

The ACS8582 tolerates wander and jitter components
greater than those shown in
a limit determined by a combination of the apparent long-
term frequency offset caused by wander and the eye-
closure caused by jitter (the input source will be rejected
if the offset pushes the frequency outside the hold-in
range for long enough to be detected, whilst the signal will
also be rejected if the eye closes sufficiently to affect the
signal purity). Either the Lock8k mode, or one of the
extended phase capture ranges should be engaged for
high jitter tolerance according to these masks.
Table 8 Input Reference Source Jitter Tolerance
Notes: (i) The frequency acceptance and generation range will be ±4.6 ppm around the required frequency when the external crystal
Revision 1.00/March 2008 ©Semtech Corp.
ADVANCED COMMS & SENSING
G.703
G.783
G.823
GR-1244-CORE
Jitter Tolerance
(ii) The fundamental acceptance range and generation range is ±9.2 ppm with an exact external crystal frequency of 12.800 MHz. This
frequency accuracy is within a tolerance of ±4.6 ppm.
is the default DPLL range, the range is also programmable from 0 to 80 ppm in 0.08 ppm steps.
±16.6 ppm
Acceptance
Frequency
Monitor
Range
Figure 8
±4.6 ppm (see Note (i))
±9.2 ppm (see Note (ii))
Frequency Acceptance Range
and
Figure
(Pull-in)
CONFIDENTIAL
9, up to
FINAL
Page 26
All reference clock ports are monitored for quality,
including frequency offset and general activity. Single
short-term interruptions in selected reference clocks may
not cause re- arrangements, whilst longer interruptions,
or multiple, short-term interruptions, will cause re-
arrangements, as will frequency offsets which are
sufficiently large or sufficiently long to cause loss-of-lock
in the phase-locked loop. The failed reference source will
be removed from the priority table and declared as
unserviceable, until its perceived quality has been
restored to an acceptable level.
±4.6 ppm (see Note (i))
±9.2 ppm (see Note (ii))
Frequency Acceptance Range
(Hold-in)
±4.6 ppm (see Note (i))
±9.2 ppm (see Note (ii))
Frequency Acceptance Range
(Pull-out)
ACS8582
DATASHEET
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