CDB61574 Cirrus Logic, Inc., CDB61574 Datasheet - Page 28

• Manufacturer Part Number: CDB61574
• Description: T1/e1 LINE Interface
• Manufacturer: Cirrus Logic, Inc.

Transformers
Recommended transmitter and receiver trans-
former specifications are shown in Table A2. The
transformers in Table A3 have been tested and
recommended for use with the CS61577. Refer to
the "Telecom Transformer Selection Guide" for
detailed schematics which show how to connect
the line interface IC with a particular transformer.
28
Ratio(s)
Secondary Leakage
Turns
1:2CT
1:2CT
1:2CT
1:2CT
Primary Leakage
dual
dual
Interwinding
ET-constant
Turns Ratio
Capacitance
Inductance
Inductance
Inductance
Primary
Table A2. Transformer Specifications
Pulse Engineering
Pulse Engineering
Pulse Engineering
Pulse Engineering
Manufacturer
Bel Fuse
Bel Fuse
Bel Fuse
Schott
600 H min. @ 772 kHz
1.3 H max. @ 772 kHz
0.4 H max. @ 772 kHz
12 V- s min. for E1
16 V- s min. for T1
1:2 CT 5%
23 pF max.
Table A3. Recommended Transformers
0553-0013-HC
Part Number
S553-0013-03
0553-0013-1J
PE-65351
67129300
PE-64951
PE-65761
PE-65835
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.
Transmit Side Jitter Attenuation
In some applications it is desirable to attenuate
jitter from the signal to be transmitted. A
CS61577 in local loopback mode can be used as a
jitter attenuator. The inputs to the jitter attenuator
are TPOS, TNEG, TCLK. The outputs from the
jitter attenuator are RPOS, RNEG and RCLK.
Line Protection
Secondary protection components can be added
to provide lightning surge and AC power-cross
immunity. Refer to the "Telecom Line Protection
Application Note" for detailed information on the
different electrical safety standards and specific
application circuit recommendations.
EN60950, EN41003 approved
1.5 kV through-hole, single
1.5 kVsurface-mount, dual
1.5 kV through-hole, dual
3 kV through-hole, single
Package Type
CS61577
DS155PP2