MT9074
Advance Information
Percentage of
Nominal Peak
Voltage
269nS
120
110
100
90
244nS
194nS
80
50
20
0
-10
-20
Nominal Pulse
219nS
488nS
Figure 8 Pulse Template (G.703)(E1)
20 Mhz Clock
Frequency:
Tolerance:
20MHz
50ppm
Oscillation Mode:
Resonance Mode:
Load Capacitance:
Fundamental
Parallel
32pF
The MT9074 requires a 20 Mhz clock. This may
provided by a 50 ppm oscillator as per Figure 9.
+5V
Maximum Series Resistance:
Approximate Drive Level:
35Ω
1mW
Vdd
20MHz
OSC1
20MHz
OUT
.1µF
GND
OSC1
56pF
39pF
1MΩ
OSC2
(open)
1µH*
100Ω
OSC2
Figure 9 - Clock Oscillator Circuit
Note: the 1µH inductor is optional
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.
Figure 10 - Crystal Oscillator Circuit
12
MITEL [ MITEL NETWORKS CORPORATION ]
