MT9074 Просмотр технического описания (PDF) - Mitel Networks

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производитель

MT9074

T1/E1/J1 Single Chip Transceiver

Mitel Networks 

MT9074

Percentage of

Nominal Peak

Voltage

120

110

100

90

80

50

269nS

244nS

194nS

Advance Information

20

0

-10

Nominal Pulse

-20

219nS

488nS

Figure 8 Pulse Template (G.703)(E1)

20 Mhz Clock

The MT9074 requires a 20 Mhz clock. This may

provided by a 50 ppm oscillator as per Figure 9.

+5V

Frequency:

Tolerance:

Oscillation Mode:

Resonance Mode:

Load Capacitance:

Maximum Series Resistance:

Approximate Drive Level:

OSC1

20MHz

OUT

Vdd

GND

.1µF

OSC1

20MHz

50ppm

Fundamental

Parallel

32pF

35Ω

1mW

20MHz

OSC2

(open)

Figure 9 - Clock Oscillator Circuit

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.

1MΩ

OSC2

56pF

39pF

100Ω

1µH*

Note: the 1µH inductor is optional

Figure 10 - Crystal Oscillator Circuit

12

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