82P33831 डेटा पत्रक PDF( Datasheet डाउनलोड )

डेटा पत्रक - Synchronization Management Unit - Integrated Device Technology

भाग संख्या 82P33831
समारोह Synchronization Management Unit
मैन्युफैक्चरर्स Integrated Device Technology 
लोगो Integrated Device Technology लोगो 
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82P33831 pdf
82P33831 Short Form Datasheet
• Access routers, edge routers, core routers
• Carrier Ethernet switches
• Multiservice access platforms
• LTE eNodeB
• IEEE 1588 / PTP Telecom Profile clock synthesizer
• ITU-T G.8273.2 Telecom Boundary Clock (T-BC) and Telecom
Time Slave Clock (T-TSC)
• ITU-T G.8264 Synchronous Equipment Timing Source (SETS)
• ITU-T G.8263 Packet-based Equipment Clock (PEC)
• ITU-T G.8262 Synchronous Ethernet Equipment Clock (EEC)
• ITU-T G.813 Synchronous Equipment Clock (SEC)
• Telcordia GR-253-CORE Stratum 3 Clock (S3) and SONET Mini-
mum Clock (SMC)
The 82P33831 Synchronization Management Unit (SMU) provides tools to manage timing references, clock sources and timing paths for IEEE
1588 / Precision Time Protocol (PTP) and Synchronous Ethernet (SyncE) based clocks. The device supports up to three independent timing paths
that control: PTP clock synthesis; SyncE clock generation; and general purpose frequency translation. The device supports physical layer timing with
Digital PLLs (DPLLs) and it supports packet based timing with Digitally Controlled Oscillators (DCOs). Input-to- input, input-to-output and output-to-
output phase skew can all be precisely managed. The device outputs low-jitter clocks that can directly synchronize 40GBASE-R, 10GBASE-R and
10GBASE-W and lower-rate Ethernet interfaces; as well as CPRI/OBSAI, SONET/SDH and PDH interfaces and IEEE 1588 Time Stamp Units
The 82P33831 accepts six differential reference inputs and six single ended reference inputs that can operate at common GNSS, Ethernet,
SONET/SDH and PDH frequencies that range in frequency from 1 Pulse Per Second (PPS) to 650 MHz. The device also provides two Alternate Mark
Inversion (AMI) inputs for Composite Clock (CC) signals bearing 64 kHz, 8 kHz and 0.4 kHz synchronization information. The references are continu-
ally monitored for loss of signal and for frequency offset per user programmed thresholds. All of the references are available to all three DPLLs. The
active reference for each DPLL is determined by forced selection or by automatic selection based on user programmed priorities and locking allow-
ances and based on the reference monitors and LOS inputs.
The 82P33831 can accept a clock reference and an associated phase locked sync signal as a pair. DPLL1 or DPLL2 can lock to the clock refer-
ence and align the frame sync and multi-frame sync outputs with the paired sync input. The device allows any of the differential or single ended refer-
ence inputs to be configured as sync inputs that can be associated with any of the other differential or single ended reference inputs. The input sync
signals can have a frequency of 1 PPS, 2 kHz, 4 kHz or 8 kHz. This feature enables DPLL1 or DPLL2 to phase align its frame sync and multi-frame
sync outputs with a sync input without the need use a low bandwidth setting to lock directly to the sync input.
DPLL1 and DPLL2 support four primary operating modes: Free-Run, Locked, Holdover and DCO. In Free-Run mode the DPLLs synthesize clocks
based on the system clock alone. In Locked mode the DPLLs filter reference clock jitter with the selected bandwidth. In Locked mode, the long-term
output frequency accuracy is the same as the long term frequency accuracy of the selected input reference. In Holdover mode, the DPLL uses fre-
quency data acquired while in Locked mode to generate accurate frequencies when input references are not available. In DCO mode the DPLL con-
trol loop is opened and the DCO can be controlled by a PTP clock recovery servo running on an external processor to synthesize PTP clocks.
The 82P33831 requires a system clock for its reference monitors and other digital circuitry. The frequency accuracy of the system clock deter-
mines the frequency accuracy of the DPLLs in Free-Run mode. The frequency stability of the system clock determines the frequency stability of the
DPLLs in Free-Run mode and in Holdover mode; and it affects the wander generation of the DPLLs in Locked and DCO modes.
When used with a suitable system clock, DPLL1 and DPLL2 meet the frequency accuracy, pull-in, hold-in, pull-out, noise generation, noise toler-
ance, transient response, and holdover performance requirements of the following applications: ITU-T G.8262/G.813 EEC/SEC options 1 and 2, ITU-
T G.8263, ITU-T G.8273.2, Telcordia GR-1244 Stratum 3 (S3), Telcordia GR-253-CORE Stratum 3 (S3) and SONET Minimum Clock (SMC).
DPLL1 and DPLL2 can be configured with a range of selectable filtering bandwidths from 0.09 mHz to 567 Hz. The 17 mHz bandwidth can be
used to lock the DPLL directly to a 1 PPS reference. The 69 mHz and the 92 mHz bandwidths can be used for G.8273.2. The 92 mHz bandwidth can
be used for G.8262/G.813 Option 2 or Telcordia GR-253-CORE S3 or SMC applications. The bandwidths in the range 1.1 Hz to 8.9 Hz can be used
for G.8262/G.813 Option 1 applications. Bandwidths above 10 Hz can be used in jitter attenuation and rate conversion applications.
DPLL1 and DPLL2 are each connected to Time of Day (ToD) counters or time accumulators; these ToD counters/time accumulators can be used
to track differences between the two time domains and to time-stamp external events by using reference inputs as triggers.
DPLL3 supports three primary operation modes: Free-Run, Locked and Holdover. DPLL3 is a wideband (BW > 25Hz) frequency translator that can
be used, for example, to convert a recovered line clock to a 1.544 MHz or 2.048 MHz synchronization interface clock.
In Telecom Boundary Clock (T-BC) and Telecom Time Slave Clock (T-TSC) applications per ITU-T G.8275.2, DPLL1 and DPLL2 are both used;
one DPLL is configured as a DCO to synthesize PTP clocks and the other DPLL is configured as an EEC/SEC to generate physical layer clocks.
Combo mode provides physical layer frequency support from the EEC/SEC to the PTP clock.
©2016 Integrated Device Technology, Inc.
Revision 6, March 24, 2016

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