MT9075B datasheet(9/78 Pages) MITEL

9 / 78 page

Preliminary Information

MT9075B

Figure 4 - Analog Line Interface

The template for the transmitted pulse, as speciﬁed in

G703, is shown in Figure 5. The nominal peak voltage

of a mark is 3 volts for 120

Ω twisted pair applications

and 2.37 volts for 75

Ω coax applications. The ratio of

the amplitude of the transmit pulses generated by TTP

and TRING is between 0.95 and 1.05.

Figure 5 - Pulse Template (G.703)

Transformer Recommendation

Table 1 shows a list of recommended transformers

for the MT9075B line interface.

Table 1 - Transformer Manufacturers and Part

Numbers

Timing Source

The MT9075B can use either a clock or crystal,

connecting to pins OSC1 and OSC2, as the

reference timing source.

Figure 6 shows a 20MHz clock oscillator, with 50ppm

tolerance, directly connected to the OSC1 pin of the

MT9075B.

Figure 6 - 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 7. The

crystal speciﬁcation is as follows.

Frequency:

20MHz

Tolerance:

50ppm

Oscillation Mode:

Fundamental

Resonance Mode:

Parallel

Load Capacitance:

32pF

Maximum Series Resistance:

Ω

Approximate Drive Level:

1mW

TTIP

TRING

RTIP

RRING

1:2

1:1

0.68uF

* 2.4

Ω resistors are only

required with 75

Ω coax

120

Ω/

75Ω

MT9075B

269nS

244nS

194nS

219nS

488nS

Nominal Pulse

120

110

100

-10

-20

Percentage of

Nominal Peak

Manufacturer

For Tx

For Rx

Filtran

5721-1

5721-2

Pulse Engineering

PE-65351

PE-64934

Midcom

50027

50026

OSEC

02934/A

02935/A

MT9075B

OSC1

OSC2

(open)

20MHz

OUT

Vdd

GND

+5V

µF

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