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參數(shù)資料
| 型號(hào)： | MT90401AB1 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | SONET/SDH System Synchronizer |
| 中文描述： | ATM/SONET/SDH SUPPORT CIRCUIT, PQFP80 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, LEAD FREE, MS-026BEC, LQFP-80 |
| 文件頁數(shù)： | 22/38頁 |
| 文件大小： | 650K |
| 代理商： | MT90401AB1 |
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MT90401
Data Sheet
22
Zarlink Semiconductor Inc.
3.6 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 MT90401 capture range is equal to
±
52 ppm minus the accuracy of the master clock
(C20i). For example, a
±
32 ppm master clock results in a capture range of
±
20 ppm.
MT90401 provides two pins and two bits, PRIOOR and SECOOR, to indicate whether the primary and secondary
reference are within the 12 ppm of the nominal frequency. When the accuracy of the 20 MHz oscillator is 4.6 ppm
the effective out of range limits of the PRIOOR and SECOOR pins will be +16.6 ppm to -7.4 ppm or +7.4 ppm to
-16.6 ppm. Both references are monitored at the same time. PRIOOR and SECOOR are updated every 1.0 to 1.5
seconds.
3.7 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 MT90401.
3.8 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. An ideal signal is one that is at exactly the nominal
frequency and is completely free of jitter and wander.
3.9 Frequency Slope
Frequency slope is measured in ppm per second and is the rate at which the fractional frequency offset of a given
signal changes. The fractional frequency offset is calculated with respect to an ideal signal. The given signal is
typically the output signal. An ideal signal is one that is at exactly the nominal frequency and is completely free of
jitter and wander.
3.10 Time Interval Error (TIE)
TIE is the time delay between a given timing signal and an ideal timing signal.
3.11 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.
3.12 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 reference switch or a
mode change.
MTIE S
TIEmax t
( )
TIEmin t
( )
–
=
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