CS61584A datasheet(51/54 Pages) CIRRUS

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CS61584A

DS261PP5

13.5

Transformers

Recommended

transformer

specifications

are

shown in Table 17. Based on these specifications,

the transformers recommended for use with the

CS61584A are listed in Table 18.

13.6

Designing for AT&T 62411

For additional information on the requirements of

AT&T 62411 and the design of an appropriate sys-

tem synchronizer, refer to the Crystal Semiconduc-

tor Application Notes "AT&T 62411 Design

Considerations - Jitter and Synchronization" and

"Jitter Testing Procedures for Compliance with

AT&T 62411."

13.7

Line Protection

Secondary protection components can be added to

the line interface circuitry to provide lightning

surge and AC power-cross immunity. For addition-

al information on the different electrical safety

standards and specific application circuit recom-

mendations, refer to the Crystal Semiconductor

Application Note "Secondary Line Protection for

T1 and E1 Line Cards."

13.8

Loop Selection Equations

The following equations indicate the different

states that various inputs have to assume to invoke

the various loopback functions available in the de-

vice.

...... RLOOP1 =TAOS1.LLOOP.RLOOP1

...... RLOOP2 =TAOS2.LLOOP.RLOOP2

...... LLOOP11 =LLOOP2.RLOOP2.RLOOP1 +

...... ..............TAOS1.RLOOP1

...... LLOOP12 =LLOOP2.RLOOP2.RLOOP1 +

...... ..............TAOS2.RLOOP2

...... LLOOP21 =TAOS1.LLOOP2.(RLOOP1 +

RLOOP2)

...... LLOOP22 =TAOS2.LLOOP2.(RLOOP1 +

RLOOP2)

Turns ratio (-IL3 and IQ3)

1:2 step-up transmit

1:2 step-down receive

Turns ratio (-IL5 and IQ5)

1:1.15 step-up transmit

1:1.15 step-down receive

Primary inductance

1.5 mH min at 772 kHz

Primary leakage

inductance

0.3 µH max at 772 kHz

with secondary shorted

Secondary leakage

inductance

0.4 µH max at 772 kHz

Interwinding capacitance

18 pF max, primary to

secondary

ET-constant

16 V-µs min

Table 17. Transformer Specifications

CS61584A

DS261F1

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