CS61575-IL1Z datasheet(28/34 Pages) CIRRUS

28 / 34 page

APPLICATIONS

Line Interface

Figures A1-A3 show typical T1 and E1 line inter-

face application circuits. Table A1 shows the

external components which are specific to each

application. Figure A1 illustrates a T1 interface in

the Host Mode. Figure A2 illustrates a 120

Ω E1

interface in the Hardware Mode. Figure A3 illus-

trates a 75

Ω E1 interface in the Extended

Hardware Mode

The receiver transformer has a grounded center

tap on the IC side. Resistors between the RTIP

and RRING pins to ground provide the termina-

tion for the receive line.

The transmitter transformer matches the 75

transmitter output impedance to the line imped-

ance. Figures A1-A3 show a 0.47

μF capacitor in

series with the transmit transformer primary. This

capacitor is needed to prevent any output stage

imbalance from resulting in a DC current through

the transformer primary. This current might satu-

rate the transformer producing an output offset

level shift.

CS61574A

CS61575

HOST

MODE

Figure A1. T1 Host Mode Configuration

Frequency

MHz

Cable

R1 and R2

Transmit

Transformer

Crystal

XTL

1.544 (T1)

100

200

1:1.15

6.176 MHz

2.048 (E1)

120

240

1:1.26

8.192 MHz

150

1:1

Table A1. External Component Values

CS61574A CS61575

DS154F3

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