MT9044AL1 Zarlink Semiconductor, Inc., MT9044AL1 Datasheet - Page 15

• Manufacturer Part Number: MT9044AL1
• Description: Dual Reference Frequency Selectable Digital PLL with Multiple Clock Outputs for T1/E1 (ITU-T G.812 type IV), Stratum (3, 4, 4E) and STS-3/OC3 Systems
• Manufacturer: Zarlink Semiconductor, Inc.

MT9044 and Network Specifications
The
requirements (intrinsic jitter/wander, jitter/wander
tolerance, jitter/wander transfer, frequency accuracy,
frequency holdover accuracy, capture range, phase
change
rearrangement) for the following specifications.
1. Bellcore GR-1244-CORE June 1995 for Stratum
2. AT&T TR62411 (DS1) December 1990 for
3. ANSI T1.101 (DS1) February 1994 for Stratum 3,
4. ETSI 300 011 (E1) April 1992 for Single Access
5. TBR 4 November 1995
6. TBR 12 December 1993
7. TBR 13 January 1996
8. ITU-T I.431 March 1993
9. ITU-T G.813 August 1996 for Option1 clocks for
10. ITU-T G.812 June 1998 for type IV clocks for
3, Stratum 4 Enhanced and Stratum 4
Stratum 3, Stratum 4 Enhanced and Stratum 4
Stratum 4 Enhanced and Stratum 4
and Multi Access
2048 kbit/s interfaces
1,544 kbit/s interfaces and 2,048 kbit/s interfaces
MT9044
slope
fully
and
meets
MTIE
all
during
applicable
reference
PLL
Applications
This section contains MT9044 application specific
details for clock and crystal operation, guard time
usage, reset operation, power supply decoupling,
Manual Control operation and Automatic Control
operation.
Master Clock
The MT9044 can use either a clock or crystal as the
master timing source.
In Freerun Mode, the frequency tolerance at the
clock outputs is identical to the frequency tolerance
of the source at the OSCi pin. For applications not
requiring an accurate Freerun Mode, tolerance of the
master timing source may be ±100ppm. For
applications requiring an accurate Freerun Mode,
such as Bellcore GR-1244-CORE, the tolerance of
the master timing source must Be no greater than
±32ppm.
Another consideration in determining the accuracy of
the master timing source is the desired capture
range. The sum of the accuracy of the master timing
source and the capture range of the MT9044 will
always equal ±230ppm. For example, if the master
timing source is ±100ppm, then the capture range
will be ±130ppm.
Clock Oscillator - when selecting a Clock Oscillator,
numerous parameters must be considered. This
includes absolute frequency, frequency change over
temperature, output rise and fall times, output levels
and duty cycle. See AC Electrical Characteristics.
For applications requiring ±32ppm clock accuracy,
the following clock oscillator module may be used.
MT9044
Figure 9 - Clock Oscillator Circuit
OSCo
OSCi
No Connection
20MHz OUT
GND
+5V
+5V
MT9044
0.1uF
15