CS61535A datasheet(29/48 Pages) CIRRUS

29 / 48 page

APPLICATIONS

Line Interface

Figures A1-A3 show the typical configurations

for interfacing the I.C. to a line through transmit

and receive transformers.

The receiver transformer is center tapped and

center grounded with resistors between the center

tap and each leg on the I.C. side. These resistors

provide the termination for the line.

Figures A1-A3 show a 0.47

µF capacitor in series

with the transmit transformer primary. This ca-

pacitor is needed to prevent any buildup in the

core of the transformer due to any DC imbalance

that may be present at the differential outputs,

TTIP and TRING. If DC saturates the trans-

former, a DC offset will result during the

transmission of a space (zero) as the transformer

tries to dump the charge and return to equilib-

rium. The blocking capacitor will keep DC

current from flowing in the transformer.

Selecting an Oscillator Crystal

Specific crystal parameters are required for

proper operation of the CS61535A. It is recom-

me n de d th a t t h e C XT617 6 from Cry st al

Control

Monitor

Frame

Format

Encoder/

Decoder

CS61535A

HOST

MODE

RECEIVE

LINE

TRANSMIT

LINE

XTL

RV+

µF

RGND

0.1

µF

+5V

1.0

µF

TGND

RV+

TV+

CLKE

ACLKI

LOS

DPM

MODE

RPOS

RNEG

RCLK

TPOS

TNEG

TCLK

XTALIN

XTALOUT

RGND

TGND

SCLK

INT

SDI

SDO

RTIP

RRING

MTIP

MRING

TRING

TTIP

0.47

µF

CT 2:1

µP

Serial

Port

+5V

100 k

Ω

DEVICE

FREQUENCY

MHz

CABLE

Ω

R1&2

Ω

Transmit

Transformer

CS61535A

1.544

2.048

100

120

200

240

150

1:1.15

1:1.26

1:1

Figure A1. Host Mode Configuration

CS61535A

DS40F2

CS61535A Datasheet(PDF) 29 Page - Cirrus Logic

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