MT9046(2003) 데이터 시트보기 (PDF) - Zarlink Semiconductor Inc

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MT9046
(Rev.:2003)

T1/E1 System Synchronizer with Holdover

Zarlink Semiconductor Inc 

MT9046

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, 19.44MHz) 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 MT9046, 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 MT9046, 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 MT9046 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 MT9046 capture range is equal to ±230 ppm minus the accuracy of the master

clock (OSCi). For example, a 32 ppm master clock results in a capture range of 198 ppm.

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 MT9046.

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)

Phase Continuity

Phase continuity is the phase difference between a given timing signal and an ideal timing signal at the end of a

particular observation period. Usually, the given timing signal and the ideal timing signal are of the same

frequency. Phase continuity applies to the output of the synchronizer after a signal disturbance due to a

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Zarlink Semiconductor Inc.

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