MT9044AP1 Zarlink Semiconductor, Inc., MT9044AP1 Datasheet - Page 16

• Manufacturer Part Number: MT9044AP1
• Description: Framer: Framer Circuit: T1/E1/OC3 System Synchronizer
• Manufacturer: Zarlink Semiconductor, Inc.

MT9044
Data Sheet
Note that the resulting jitter transfer functions for all combinations of inputs (8kHz, 1.544MHz, 2.048MHz) and
outputs (8kHz, 1.544MHz, 2.048MHz, 4.096MHz, 8.192MHz, 16.384MHz) for a given input signal (jitter frequency
and jitter amplitude) are the same.
Since intrinsic jitter is always present, jitter attenuation will appear to be lower for small input jitter signals than for
large ones. Consequently, accurate jitter transfer function measurements are usually made with large input jitter
signals (e.g. 75% of the specified maximum jitter tolerance).
Frequency Accuracy
Frequency accuracy is defined as the absolute tolerance of an output clock signal when it is not locked to an
external reference, but is operating in a free running mode. For the MT9044, the Freerun accuracy is equal to the
Master Clock (OSCi) accuracy.
Holdover Accuracy
Holdover accuracy is defined as the absolute tolerance of an output clock signal, when it is not locked to an external
reference signal, but is operating using storage techniques. For the MT9044, the storage value is determined while
the device is in Normal Mode and locked to an external reference signal.
The absolute Master Clock (OSCi) accuracy of the MT9044 does not affect Holdover accuracy, but the change in
OSCi accuracy while in Holdover Mode does.
Capture Range
Also referred to as pull-in range. This is the input frequency range over which the synchronizer must be able to pull
into synchronization. The MT9044 capture range is equal to ±230ppm minus the accuracy of the master clock
(OSCi). For example, a ±32ppm master clock results in a capture range of ±198ppm.
Lock Range
This is the input frequency range over which the synchronizer must be able to maintain synchronization. The lock
range is equal to the capture range for the MT9044.
Phase Slope
Phase slope is measured in seconds per second and is the rate at which a given signal changes phase with respect
to an ideal signal. The given signal is typically the output signal. The ideal signal is of constant frequency and is
nominally equal to the value of the final output signal or final input signal.
Time Interval Error (TIE)
TIE is the time delay between a given timing signal and an ideal timing signal.
Maximum Time Interval Error (MTIE)
MTIE is the maximum peak to peak delay between a given timing signal and an ideal timing signal within a
particular observation period.
MTIE S ( )
TIEmax t ( ) TIEmin t ( )
=
–
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