Cirrus Logic CS61584A - Manual (Page 51)

CS61584A
DS261PP5 51
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 51