CS61584A Cirrus Logic, Inc., CS61584A Datasheet - Page 51

• Manufacturer Part Number: CS61584A
• Description: Dual T1/e1 Line Interface
• Manufacturer: Cirrus Logic, Inc.

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."
DS261PP5
DS261F1
Turns ratio (-IL3 and IQ3)
Turns ratio (-IL5 and IQ5)
Primary inductance
Primary leakage
inductance
Secondary leakage
inductance
Interwinding capacitance
ET-constant
Table 17. Transformer Specifications
1:2 step-up transmit
1:2 step-down receive
1:1.15 step-up transmit
1:1.15 step-down receive
1.5 mH min at 772 kHz
0.3 µH max at 772 kHz
with secondary shorted
0.4 µH max at 772 kHz
18 pF max, primary to
secondary
16 V-µs min
DS261PP5
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.
RLOOP2)
RLOOP2)
...... RLOOP1 =TAOS1.LLOOP.RLOOP1
...... RLOOP2 =TAOS2.LLOOP.RLOOP2
...... LLOOP11 =LLOOP2.RLOOP2.RLOOP1 +
...... ..............TAOS1.RLOOP1
...... LLOOP12 =LLOOP2.RLOOP2.RLOOP1 +
...... ..............TAOS2.RLOOP2
...... LLOOP21 =TAOS1.LLOOP2.(RLOOP1 +
...... LLOOP22 =TAOS2.LLOOP2.(RLOOP1 +
CS61584A
CS61584A
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