zl50022 Zarlink Semiconductor, zl50022 Datasheet - Page 91
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zl50022
Manufacturer Part Number
zl50022
Description
Enhanced 4 K Digital Switch With Stratum 4e Dpll
Manufacturer
Zarlink Semiconductor
Datasheet
1.ZL50022.pdf
(121 pages)
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25.1.2
When an external clock oscillator is used, numerous parameters must be considered. They include absolute
frequency, frequency change over temperature, output rise and fall times, output levels and duty cycle.
The output clock should be connected directly (not AC coupled) to the OSCi input of the device, and the OSCo
output should be left open as shown in Figure 24 on page 91. XC is a buffered version of the 20 MHz input clock
connected to the internal circuitry.
For applications requiring ±32 ppm clock accuracy, the following requirements should be met:
Load Capacitance
Maximum Series Resistance
Approximate Drive Level
Frequency
Tolerance
Rise and Fall Time
Duty Cycle
External Clock Oscillator
XC
4K DX
Figure 24 - Clock Oscillator Circuit
20 pF - 32 pF
35 Ω
1 mW
Zarlink Semiconductor Inc.
20.000 MHz
±32 ppm
10 ns
40% to 60%
ZL50022
OSCo
OSCi
No Connection
91
20 MHz OUT
+3.3 V
+3.3 V
GND
0.1 uF
Data Sheet
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