CS61583 datasheet(31/44 Pages) CIRRUS

31 / 44 page

APPLICATIONS

Line Interface

Figure A1 illustrates a typical connection diagram

and Table A1 lists the external components that

are required in T1 and E1 applications.

In the transmit line interface circuitry, capacitors

C1 and C2 provide transmitter return loss. The

0.47

µF capacitor in series with the transformer

primary prevents output stage imbalances from

producing a DC current through the transformer

that might saturate the transformer and result in

an output level offset.

In the receive line interface circuitry, resistors R1-

R4 provide receive impedance matching and

receiver return loss. The 0.47

µF capacitor to

ground provides the necessary differential input

voltage reference for the receiver.

Power Supply

As shown in Figure A1, the CS61583 operates

from a 5.0 Volt supply. Separate analog and digi-

tal power supply and ground pins provide internal

isolation. The TGND, RGND, and DGND ground

pins must not be more negative than AGND. It is

recommended that all of the supply pins be con-

nected together at the device. A 4.99k

Ω ±1%

AV+ AGND1:2 BGREF

TV+1

TGND1

RV+1 RGND1 DV+ DGND1:3

0.01

µF

TCLK1

TPOS1 (TDATA1)

TNEG1 (AIS1)

RCLK1

RPOS1 (RDATA1)

RNEG1 (BPV1)

TCLK2

TPOS2 (TDATA2)

TNEG2 (AIS2)

RCLK2

RPOS2 (RDATA2)

RNEG2 (BPV2)

Framer

TTIP1

TRING1

1:1.15

RTIP1

RRING1

TTIP2

TRING2

RTIP2

RRING2

1:1.15

Hardware Control

Power Supply

Clock Generator

Channel 2

Channel 1

transmit

0.1

µF

0.1

µF

TV+2

TGND2

RV+2

RGND2

µF

0.1

µF

0.1

µF

0.1

µF

1:1.15

receive

1:1.15

receive

4.99k

Ω

VCC

0.47

µF

0.47

µF

REFCLK 1XCLK RESET

CLKE

TAOS1

LLOOP1

RLOOP1

CON01

CON11

CON21

RLOOP2

LLOOP2

TAOS2

CON02

CON12

CON22

AMI2

AMI1

CODER2

CODER1

ATTEN1

ATTEN2

0.47

µF

0.47

µF

Figure A1. Typical Connection Diagram

Data Rate (MHz)

REFCLK Frequency (MHz)

Cable (

Ω)R1-R4 (Ω)

C1-C2 (pF)

1XCLK = 1

1XCLK = 0

1.544

12.352

100

38.3

220

2.048

16.384

28.7

470

120

45.3

220

Table A1. CS61583 External Components

CS61583

DS172PP5

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