MT9040 데이터 시트보기 (PDF) - Zarlink Semiconductor Inc

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MT9040

T1/E1 Synchronizer

Zarlink Semiconductor Inc 

MT9040

Data Sheet

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 AT&T TR62411, 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 MT9040 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.

MT9040

OSCi

+3.3V

+3.3V

20MHz OUT

GND

0.1uF

OSCo

No Connection

Figure 5 - Clock Oscillator Circuit

For applications requiring ±32ppm clock accuracy, the following clock oscillator module may be used.

FOX F7C-2E3-20.0MHz

Frequency:

Tolerance:

Rise & Fall Time:

Duty Cycle:

20MHz

25ppm 0C to 70C

10ns (0.33V 2.97V 15pF)

40% to 60%

CTS CB3LV-5I-20.0 MHz

Frequency:

Tolerance:

Rise & Fall Time:

Duty Cycle:

20MHz

25ppm

10ns

45% to 55%

The output clock should be connected directly (not AC coupled) to the OSCi input of the MT9040, and the OSCo

output should be left open as shown in Figure 9.

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 6.

10

Zarlink Semiconductor Inc.

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