MT9074 Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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MT9074

T1/E1/J1 Single Chip Transceiver

Zarlink Semiconductor Inc 

MT9074

Data Sheet

Alternatively, a crystal oscillator may be used. A complete oscillator circuit made up of a crystal, resistors and

capacitors is shown in Figure 10. The crystal specification is as follows.

Frequency:

Tolerance:

Oscillation Mode:

Resonance Mode:

Load Capacitance:

Maximum Series Resistance:

Approximate Drive Level:

20 MHz

50 ppm

Fundamental

Parallel

32 pF

35 Ω

1 mW

OSC1

1 MΩ

OSC2

20 MHz

56 pF

39 pF

100 Ω

1 µH*

Note: the 1 µH inductor is optional

Figure 10 - Crystal Oscillator Circuit

dB

-0.5

0

-20 dB/decade

19.5

10

40

400

10K

Frequency (Hz)

Figure 11 - TR 62411 Jitter Attenuation Curve

23

Zarlink Semiconductor Inc.

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