MT9076 Просмотр технического описания (PDF) - Mitel Networks

Номер в каталоге

Компоненты Описание

производитель

MT9076

T1/E1/J1 3.3V Single Chip Transceiver

Mitel Networks 

MT9076

OSC1

+3.3V

20MHz

OUT

Vdd

GND

Preliminary Information

.1µF

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.

Frequency:

Tolerance:

Oscillation Mode:

Resonance Mode:

Load Capacitance:

Maximum Series Resistance:

Approximate Drive Level:

20MHz

50ppm

Fundamental

Parallel

32pF

35Ω

1mW

OSC1

20MHz

1MΩ

OSC2

56pF

39pF

100Ω

1µH*

Note: the 1µH inductor is optional

Figure 10 - Crystal Oscillator Circuit

1.4 Phase Lock Loop (PLL)

The MT9076 contains a PLL, which can be locked to either an input 4.096 Mhz clock or the extracted line

clock.The PLL will attenuate jitter from less than 2.5 Hz and roll-off at a rate of 20 dB/decade. Its intrinsic jitter

is less than 0.02 UI. The PLL will meet the jitter transfer characteristics as specified by AT&T document

TR 62411and the relevant recommendations as shown in Figure 12.

22

Share Link: