參數(shù)資料
型號(hào)： ZL30102
廠商： Zarlink Semiconductor Inc.
英文描述： T1/E1 Stratum 4/4E Redundant System Clock Synchronizer for DS1/E1 and H.110
中文描述： T1/E1的地層4/4E冗余系統(tǒng)時(shí)鐘同步的的DS1/E1和H.110
文件頁(yè)數(shù)： 35/50頁(yè)
文件大?。?/td> 481K
代理商： ZL30102
ZL30102
Data Sheet
35
Zarlink Semiconductor Inc.
6.2.1 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, duty cycle and phase noise.
The output clock should be connected directly (not AC coupled) to the OSCi input of the ZL30102, and the OSCo
output should be left open as shown in Figure 20.
Figure 20 - Clock Oscillator Circuit
6.2.2 Crystal Oscillator
Alternatively, a Crystal Oscillator may be used. A complete oscillator circuit made up of a crystal, resistor and
capacitors is shown in Figure 21.
The accuracy of a crystal oscillator depends on the crystal tolerance as well as the load capacitance tolerance.
Typically, for a 20 MHz crystal specified with a 32 pF load capacitance, each 1 pF change in load capacitance
contributes approximately 9 ppm to the frequency deviation. Consequently, capacitor tolerances and stray
capacitances have a major effect on the accuracy of the oscillator frequency.
The crystal should be a fundamental mode type - not an overtone. The fundamental mode crystal permits a simpler
oscillator circuit with no additional filter components and is less likely to generate spurious responses. A typical
crystal oscillator specification and circuit is shown in Table 8 and Figure 21 respectively.
.
1
Frequency
20 MHz
2
Tolerance
as required
3
Rise & fall time
< 10 ns
4
Duty cycle
40% to 60%
Table 7 - Typical Clock Oscillator Specification
1
Frequency
20 MHz
2
Tolerance
as required
3
Oscillation mode
fundamental
4
Resonance mode
parallel
5
Load capacitance
as required
6
Maximum series resistance
50
Table 8 - Typical Crystal Oscillator Specification
+3.3 V
20 MHz OUT
GND
0.1 μF
+3.3 V
OSCo
ZL30102
OSCi
No Connection
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