CS61577-IL1 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CS61577-IL1

T1/E1 Line Interface

Cirrus Logic 

CS61577

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.

Turns Ratio

Primary

Inductance

Primary Leakage

Inductance

Secondary Leakage

Inductance

Interwinding

Capacitance

ET-constant

1:2 CT ± 5%

600 µH min. @ 772 kHz

1.3 µH max. @ 772 kHz

0.4 µH max. @ 772 kHz

23 pF max.

16 V-µs min. for T1

12 V-µs min. for E1

Table A2. Transformer Specifications

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.

Turns

Ratio(s)

1:2CT

dual

1:2CT

dual

1:2CT

1:2CT

Manufacturer

Pulse Engineering

Schott

Bel Fuse

Pulse Engineering

Bel Fuse

Pulse Engineering

Bel Fuse

Pulse Engineering

Part Number

PE-65351

67129300

0553-0013-HC

PE-64951

0553-0013-1J

PE-65761

S553-0013-03

PE-65835

Package Type

1.5 kV through-hole, single

1.5 kV through-hole, dual

1.5 kVsurface-mount, dual

3 kV through-hole, single

EN60950, EN41003 approved

Table A3. Recommended Transformers

28

DS155PP2

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