參數(shù)資料
型號(hào)： MT9041B
廠商： Mitel Networks Corporation
英文描述： T1/E1 System Synchronizer(T1/E1系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成）)
中文描述： T1/E1的系統(tǒng)同步（T1/E1的系統(tǒng)同步裝置（由一個(gè)數(shù)字鎖相環(huán)組成））
文件頁(yè)數(shù)： 6/20頁(yè)
文件大?。?/td> 87K
代理商： MT9041B
MT9041B
6
For the MT9041B, two internal elements determine
the jitter attenuation. This includes the internal 1.9Hz
low pass loop filter and the phase slope limiter. The
phase slope limiter limits the output phase slope to
5ns/125us. Therefore, if the input signal exceeds this
rate, such as for very large amplitude low frequency
input jitter, the maximum output phase slope will be
limited (i.e., attenuated) to 5ns/125us.
The MT9041B has nine outputs with three possible
input frequencies for a total of 27 possible jitter
transfer functions. However, the data sheet section
on AC Electrical Characteristics - Jitter Transfer
specifies transfer values for only three cases, 8kHz
to 8kHz, 1.544MHz to 1.544MHz and 2.048MHz to
2.048MHz. Since all outputs are derived from the
same signal, these transfer values apply to all
outputs.
It should be noted that 1UI at 1.544MHz is 644ns,
which is not equal to 1UI at 2.048MHz, which is
488ns. Consequently, a transfer value using different
input and output frequencies must be calculated in
common units (e.g. seconds) as shown in the
following example.
What is the T1 and E1 output jitter when the T1 input
jitter is 20UI (T1 UI Units) and the T1 to T1 jitter
attenuation is 18dB
Using the above method, the jitter attenuation can be
calculated for all combinations of inputs and outputs
based on the three jitter transfer functions provided.
Note that the resulting jitter transfer functions for all
combinations of inputs (8kHz, 1.544MHz, 2.048MHz)
and
outputs
(8kHz,
4.096MHz, 8.192MHz, 16.384MHz) for a given input
signal (jitter frequency and jitter amplitude) are the
same.
1.544MHz,
2.048MHz,
Since
attenuation will appear to be lower for small input
jitter signals than for large ones. Consequently,
accurate jitter transfer function measurements are
intrinsic
jitter
is
always
present,
jitter
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 MT9041B, the Freerun
accuracy is equal to the Master Clock (OSCi)
accuracy.
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 MT9041B
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
synchronization. The lock range is equal to the
capture range for the MT9041B.
able
to
maintain
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.
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. The
observation period is usually the time from the
disturbance, to just after the synchronizer has settled
to a steady state.
In the case of the MT9041B, the output signal phase
continuity is maintained to within
±
5ns at the
instance (over one frame) of mode changes. The
total phase shift may accumulate up to
±
200ns over
OutputT
1
InputT
1
A
–
20
------
×
10
20
=
OutputT
1
20
–
×
10
2.5
UI T
1
)
=
=
OutputE
1
OutputT
1
ns
488
ns
(
)
)
-644
3.3
UI T
1
)
=
×
=
OutputE
1
OutputT
1
UIT
1
1
UIE
1
(
)
)
-1
×
=
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT9041BP 制造商:Microsemi Corporation 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述:PCM, OTHER/SPECIAL/MISCELLANEOUS, 28 Pin, Plastic, PLCC
MT9041BP1 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 5V 28PLCC - Rail/Tube 制造商:Microsemi Corporation 功能描述:PB FREE MULTIPLE OUTPUT TRUNK PLL 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1 /T1 5V 28PLCC - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:PB FREE MULTIPLE OUTPUT TRUNK PLL
MT9041BPR 制造商:Microsemi Corporation 功能描述:SPECIALTY TELECOM CIRCUIT, 28 Pin Plastic PLCC
MT9041BPR1 制造商:Microsemi Corporation 功能描述:FRAMER E1 /T1 5V 28PLCC - Tape and Reel 制造商:Zarlink Semiconductor Inc 功能描述:FRAMER E1 /T1 5V 28PLCC - Tape and Reel
MT9042 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Global Digital Trunk Synchronizer
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