MT9076 Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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производитель

MT9076

T1/E1/J1 3.3 V Single Chip Transceiver

Zarlink Semiconductor Inc 

MT9076B

Data Sheet

WR

TX2-0

Name

Functional Description

Winding Ratio. Set this pin low if a 1:2.4 transformer is used on the transmit side. Set this pin high

if a 1:2 transformer is used.

Transmit pulse amplitude. Select the TX2 –TX0 bits according to the line type, value of

termination resistors (RT), and transformer turns ratio used.

TX2 TX1 TX0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

Line Impedance (ohms)

120

120

120

75

-

75

75

75

RT(ohms)

0

6.8

6.8

5.1

-

6

6

5.1

Transformer Ratio

1:2.4

1:2.4

1:2.4

1:2.4

-

1:2

1:2

1:2.4

WR (bit 7)

0

0

0

0

-

1

1

0

After reset, these bits are zero.

Table 2 - Transmit Pulse Amplitude (E1)

1.20

1.05

0.95

0.90

0.80

0.50

0.05

0

-0.05

-0.26

-0.45

Time, in unit intervals (UI)

NOTE: 1 Unit Interval = 648 nanoseconds

Figure 6 - Pulse Template (T1.403)(T1)

25

Zarlink Semiconductor Inc.

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