CS61305A View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

CS61305A

T1/E1 Line Interface

Cirrus Logic 

CS61305A

Control

&

Monitor

Frame

Format

Encoder/

Decoder

XTL

+

68 µF

+5V

0.1 µF

+

1.0 µF +5V

RGND

28 CLKE

1 ACLKI

12 LOS

11 DPM

RV+

5

7

6

8

MODE

RPOS

RNEG

RCLK

3 TPOS

4 TNEG

2 TCLK

9 XTALIN

10 XTALOUT

21

RV+

15

TV+

TGND

SCLK 27

CS 26

INT 23

SDI 24

SDO 25

CS61305A

IN

HOST

MODE

RTIP 19

RRING 20

MTIP 17

MRING 18

TRING 16

TTIP 13

RGND TGND

22

14

100 k Ω

µP

Serial

Port

200 Ω

200 Ω

0.47 µF

1

2

3

6

5

2CT:1

PE-65351

RECEIVE

LINE

2

1

6

5

1:1.15

PE-65388

TRANSMIT

LINE

Figure A2. T1 Host Mode Configuration

Figures A2-A4 show a 0.47 µF capacitor in series

with the transmit transformer primary. This ca-

pacitor 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.

Transformers

Recommended transmitter and receiver trans-

former specifications are shown in Table A2. The

transformers in Table A3 are recommended for

use with the CS61305A. Refer to the "Telecom

Transformer Selection Guide" for detailed sche-

matics which show how to connect the line

interface IC with a particular transformer.

Selecting an Oscillator Crystal

Specific crystal parameters are required for

proper operation of the jitter attenuator. It is rec-

ommended that the Crystal Semiconductor

CXT6176 crystal be used for T1 applications and

the CXT8192 crystal be used for E1 applications.

Line Protection

Secondary protection components can be added

to provide lightning surge and AC power-cross

immunity. Refer to the Application Note "Secon-

dary Line Protection for T1 and E1 Line Cards"

for detailed information on the different electrical

safety standards and specific application circuit

recommendations.

26

DS157PP3

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